Friday, March 16, 2018

Computer Network and Data Communication (All Questions)

1.      What is communication?
2.      What is telecommunication? Give any two examples.
3.      What is data communication? Give any two examples.
4.      What are the components of data communication?
5.      List the modes of transmission?
6.      What is simplex mode? Give any two examples.
7.      What is half-duplex mode? Give any two examples.
8.      What is full-duplex mode? Give any two examples.
9.      What is bandwidth? How can we measure bandwidth?
10.   What is communication / transmission medium? Give any two examples.
11.   List the types of communication medium with examples of each.
12.   Differentiate between guided and unguided medium?
13.   Differentiate between shielded and unshielded twisted pair cable.
14.   Differentiate between radio wave and microwave communication medium.
15.   What is computer network?
16.   List any four advantages of computer network.
17.   List any four disadvantages of computer network.
18.   Computer network reduces the cost of operation. Explain.
19.   Who is network administrator? Write his/her responsibilities.
20.   Differentiate between LAN and WAN.
21.   Differentiate between LAN and MAN.
22.   Differentiate between MAN and WAN.
23.   List any four features of LAN.
24.   List any four features of MAN.
25.   List any four features of WAN.
26.   What is network topology? Write its types.
27.   What is bus topology? Draw a neat and well labeled diagram of bus topology.
28.   What is star topology? Draw a neat and well labeled diagram of star topology.
29.   What is ring topology? Draw a neat and well labeled diagram of ring topology.
30.   List any two-two advantages and disadvantages of bus topology.
31.   List any two-two advantages and disadvantages of ring topology.
32.   List any two-two advantages and disadvantages of star topology.
33.   List the types of computer architecture / models.
34.   Differentiate between client/server and peer to peer network.
35.   List any two-two advantages and disadvantages of client/server network.
36.   List any two-two advantages and disadvantages of peer to peer network.
37.   List the hardware components of computer network.
38.   List the software components of computer network.
39.   Define server and workstation.
40.   What is NIC? Write its role in computer network.
41.   What is connector? Give some examples of it.
42.   Define hub and switch.
43.   What is repeater?
44.   What is router?
45.   What is gateway?
46.   What is MODEM? Write its importance.
47.   What is network operating system? Give any two examples of it.
48.   What is device driver?
49.   What is protocol? Give any four examples of it.
50.   Define modulation and demodulation.

Chapter -1
Networking & Telecommunication

1)     What is communication?
Ans: Communication is sending and receiving information between two or more persons. It is derived from the Latin word ‘communicare’.

2)     What is telecommunication?
Ans: Telecommunication is a system of transmission of sounds, images, texts or data in the form of electronic signals.

3)     What is data communication?
Ans: Data communication system is the collection of hardware, software and other devices that allows to exchange data, information and voice between two or more devices through a wire or radio waves.

4)     Give any two examples of data communication.
Ans: Any two examples of data communication are:
a)      E-mail
b)     Chat

5)     Write down the components of data communication.
Ans: The components of data communication are:
i) Data         ii) Sender          iii) Medium       iv) Receiver      v) Protocol

6)     What is medium?
Ans: A path through which the sender makes communication to the receiver is known as medium.

7)     What is communication protocol?
Ans: A communication protocol is a set of rules by which computers on the network communicate with each other.

8)     List the function of protocol.
Ans: The functions of protocol are
a.      Connection control
b.      Helps to transfer data either in connectionless or connection oriented.
c.      Sequencing supports ordered delivery flow control and error control.

9)     What is data transmission mode?
Ans: Data transmission mode is the way of transmission of data from one location to another.

10)  Write down the modes of data transmission.
Ans: The modes of data transmission are:
i) Simplex mode       ii)Half duplex mode       iii) Full Duplex Mode

11)  Define simplex mode with example.
Ans: The transmission mode in which transmission of data can take place in one direction only is called simplex mode.
E.g.: Newspaper, Radio and Television.

12)  Define half duplex mode with example.
Ans: The transmission mode in which transmission of data can take place in both directions but only in one direction at a time is called half duplex mode.
E.g.: Wireless handset and walkie-talkie.

13)  What is full duplex mode? Give example.
Ans: The transmission mode in which data can be transmitted in both the directions simultaneously is called full duplex mode.
E.g.: Telephone, internet etc.

14)  What is bandwidth?
Ans: Bandwidth can be defined as the maximum volume of data that can be transmitted through a communication system.

15)  How can we measure bandwidth?
Ans: We can measure bandwidth in digital devices by bits per second and in analogue devices by cycles per second or Hertz (Hz).

16)  What is communication or transmission medium?
Ans: Transmission medium is a pathway through which data are transmitted in a network.

17)  Write down the types of communication medium.
Ans: The types of communication medium are:
i) Guided or bounded or wired medium
ii) Unguided or unbounded or wireless medium

18)  What is guided medium?
Ans: Guided transmission medium are the cables that are tangible or have physical existence and are limited by the physical geography. E.g.: twisted pair cable, co-axial cable, fibre optics cable, etc.

19)  What is unguided medium?
Ans: Unguided transmission medium is the transmission medium in which data signals flow through the air or space without using any cables. E.g.: radio wave , microwave, infrared etc.

20)  What is twisted pair cable?
Ans: A pair of wires twisted with each other is known as twisted pair cable. A set of four pairs of twisted wires are bundled to form cable. These are the most common medium for LAN. Wires are twisted with each other so as to reduce the interference.
Its types are:
a)      Unshielded Twisted Pair Cable
b)     Twisted Pair Cable

21)  Differentiate between shielded and unshielded twisted pair.
Ans: The differences between shielded twisted pair and unshielded twisted pair are:
Shielded twisted pair
Unshielded twisted pair
·  It is made up of twisted pair wires with additional shielded and drain wires.
·   It is made up of twisted pair wires without additional shielded and drain wires.
·  D-shell connectors are used with shielded twisted pair.
·   RJ-45 connector is commonly used with unshielded twisted pair.

22)  What is co-axial cable?
Ans: A wire with single ended single reference where the central conductor carries the data signal.

23)  What is fiber optics cable?
Ans: Fiber optics cable is one of the costlier cables used in data communication which uses light to carry a data signal through the cable.

24)  What is radio wave transmission?
Ans: The transmission making use of radio frequencies is termed  as radio wave transmission.

25)  List the advantages of radio wave transmission.
Ans: The advantages of radio wave transmission are
a)      It offers mobility.
b)     It offers ease of communication over different terrain.
c)      It offers freedom from land acquisition rights that are required for laying repairing cables.
d)     It provides cheaper than digging trenches for laying cables and maintaining repeaters and cables if cables get broken by a variety of causes.

26)  What is microwave transmission?
Ans: The transmission which involves sending signals from one microwave station to another  is called microwave transmission.

27)  What are the advantages and disadvantages of microwave transmission?
Ans: The advantages of microwave transmission are
a.      They have the ability to communicate over oceans.
b.      It offers ease of communication over difficult terrain.
The disadvantages of microwave transmission are
a.      It is an insecure communication.
b.      It is susceptible to weather effects like rain, thunder storms etc.

28)    Differentiate between radio wave and microwave communication media.
       Ans: The differences between radio wave and microwave are as follows:
Radio wave
·  It is a form of wireless communications in which signals are sent through radio frequency waves.
·   It is a form of wireless communication in which data signals are sent through pulses of electromagnetic energy.
·  It provides low bandwidth for data communication.
·   It provides higher bandwidth for data communication.

29)  What is infrared transmission?
Ans: Infrared transmissions are just below visible transmission light which allows high speed data transmission.

30)  What is computer network?
Ans: A group of interconnected computers through transmission media in order to communicate and share resources like hardware, data and software.

31)  Write down any four advantages of computer network.
Ans: Any four advantages of computer network are as follows:
i) The computers on a network can share hardware devices like printer, hard disk, scanner etc.
ii) File can be transferred from one computer to another in a network.
iii) Computers on the network can communicate with each other.
iv) Software packages can be shared between network connected computers.

32)  Write any 4 disadvantages of computer network.
Ans: Any 4 disadvantages of computer network are as follows:
i) The sharing of information may leak the privacy of other clients.
ii) If any computer system in a network gets affected by computer virus, there is a big chance of spreading computer viruses on other computers on the network.
iii) Computers on the network have to depend on the server computer for the recourses.
iv) Data and information may be stolen by computer hackers if the security of network is not reliable.

33)  Computer Network reduces expenses of an office. Justify this statement with an example.
Ans: Computer Network reduces expenses of an office because computer on a network share different hardware devices like printers, scanners, hard disk etc. And sharing those hardware devicAes will reduces the expense of an office. For example if there are twenty computers in an office, now for printing the data there is no need to buy twenty printers individually rather than simple network the computer and connect the printer on the network which helps in sharing of the one printer among twenty computers which reduces the cost of buying nineteen printers individually.

34)  Mention the reasons of keeping computers on the network.
Ans: The reasons of keeping computers on the network are
a)      To share hardware devices like printers, scanners, hard disks etc.
b)     To share data, information and programs.
c)      To communicate with each other.

35)  Computer network makes the world a small place. Justify.
Ans: Computer network makes the world small place. It is true because in computer network we can know about the events and things place outside or inside the country sitting within a room. And we also can communicate with our relatives who are far away from us or has gone to abroad for job or study. Therefore, computer network makes the world a small place.

36)  What are the hardware and software components of a computer network?
Ans: The hardware components of a network are:
a)      Computer system (Server or Workstation)
b)     Network connectors
c)      Network cables
d)     NIC
e)      MODEM
The software components of computer network are:
a)      Network protocol
b)     Network operating system
37)  What is network operating system?
Ans: Network operating system is a set of computer program that manages the resources on network.

38)  Give any four examples of network operating system.
Ans: Any four examples of network operating system are:
·        Novell network
·        Microsoft Windows NT
·        Linux
·        Unix

39)  List the main goals of computer network.
Ans: The main goals of computer network are
a.      Resource sharing
b.      Reliability
c.      Communication medium
d.      Access to remote database
e.      Easy data transfer

40)  Define hardware components.
Ans: Physical parts and devices used to connect computers in the network environment are called hardware components.

41)  What is server?
Ans: A computer on a network that allows a user to use it as a workstation and provides facilities of sharing its resources to other computers on the network is dedicated server. A computer that controls and provides hardware and software resources to other computers on the network is called non-dedicated server.

42)  Define dedicated and non-dedicated server.
Ans: A server is the main computer that provides services, data and other resources to the other computers in the network environment. Network operating software used by server are Novell Netware, Linux, Unix etc.

43)  What is workstation?
Ans: Workstation is a computer network that utilizes network resources. Network operating software used by workstation are Windows 98, Windows XP etc.

44)  What is node?
Ans: Each computer or device of network is called node.

45)  Define LAN.
Ans: A LAN is a network of computers that are relatively near to each other and are connected in a way that enables them to communicate by using cables and small wireless devices.

46)  Define MAN.
Ans: A MAN is a network of computer is computers which are spread over a metropolitan area such as within a city.

47)  Define WAN.
Ans: A WAN is a network system of connecting two or more computers generally across a wide geographical area such as cities, districts, and countries.

48)  Write down the differences between LAN and MAN.
It is a network which covers small area i.e. within a room, building, or short distance.
It is a network which covers an entire city or a big area.
It is controlled by a single organization.
It is controlled by single or group of organization.
It uses private connection media.
It uses private or public connection media.
E.g.: network in a school, college or cyber café.
E.g.: interconnection between different branches on same branch

49)  Write down the differences between MAN and WAN.
It is a network which covers an entire city.
It is a network that covers large area or whole world.
E.g.: interconnection between different branches on same branch
Eg. Internet

50)  Write down any three features of LAN.
Ans: Any three features of LAN are:
i) The diameter is not more than a few kilometres.
ii) LAN offers bandwidth of 10-100 Mbps.
iii) It is controlled by single organization.

51)  Write down the features of MAN.
Ans: The features of MAN are:
i) It covers a larger geographical area than LAN and connects larger number of computer.
ii) It is owned by single or multiple organizations.
iii) It uses cable or wireless communication media to connect computers.
iv) It offers a number of network services compatible with bandwidth from 128 kbps to 1 Gbps.

52)  Write down the features of WAN.
Ans: The features of WAN are:
i) It is not restricted to a geographical location. It covers whole world.
ii) It uses satellite links or microwave system to connect several LANs and MANs
iii) It is owned by multiple organizations.
iv) Data transmission in WAN is slower than LANs and WANs

53)  A WAN is composed of LANs and MANs. Justify.
Ans: A WAN is composed of LANs and MANs, it is true because big organization or offices may have branches within different zones of Nepal or outside Nepal. The branches may have different LANs and the computers on one branch may be connected with computers of other branches through telephone lines or unbounded media. i.e. MAN. So, a WAN is composed of LANs and MANs.

54)  WANs are different from  LANs. Explain.
Ans: WANs are different from LANs because WAN covers a larger geographical area whereas LAN covers very small area. WAN is owned by multiple organizations whereas LAN is owned by single organization. WAN uses public connections mediums such as telephone lines, wireless technology etc.

55)  What is network topology?
Ans: The arrangement or connection pattern of computers or nodes and other devices of the network is called network topology.

56)  List the three basic topologies.
Ans: The three basic topologies are
a)      Bus Topology
b)     Ring Topology
c)      Star Topology

57)  What is bus topology?
Ans: The network topology in which computers and other devices are arranged in linear format is called bus topology.

58)  What is ring topology?
Ans: The network topology in which computers are connected in the shape of a circle without any end points is called ring topology.

59)  What is star topology?
Ans: The network topology in which all computers or other devices are connected through a central device through a central device called hub or switch is called star topology.

60)  What are the advantages and disadvantages of ring topology?
Ans: The advantages of ring topology are :
i) It is easy it set up and configure.
ii) Each computer gets equal opportunity to access the network resources.
iii) It supports high data transmission rate.
iv) Performs better than a star topology under heavy network load.
The disadvantages of ring topology are :
i)Failure of any cable or single computers may affect the entire network.
ii) It is difficult to detect the errors.
iii) Adding/removing the devices affect the entire network.
iv) Much slower than an Ethernet network under normal load.

61)  What are the advantages and disadvantages of star topology?
Ans: The advantages of star topology are :
i) Easy to set up and configure.
ii) Failure of single computer or cable doesn’t affect the entire network.
iii) It is easy to find the fault.
iv) It is easy to extend to network by attaching new devices to the central devices.
The disadvantages of star topology are:
i) It requires more cable in comparison of bus topology so it is more costly.
ii) Failure of central devices (hub or switch) break down the whole system.

62)  What are the advantages and disadvantages of bus topology?
Ans: The advantages of bus topology are:
a)      It is easy to set up computers and other devices in bus topology, because all the devices are connected through a single wire.
b)     It requires fewer cable media, so it is cheaper than other topologies.
c)      It is easy to add new node to the network.
d)     Failure of one workstation does not affect other computers on the network.
The disadvantages of disadvantages are:
a)      The whole network system collapses if the cable or backbone is damaged.
b)     The network slows down if additional computers are connected.
c)      The limited length of the cable in a network may restrict to connect the workstation or devices.
d)     It is difficult to find fault in this network topology.

63)  What is network architecture?
Ans: The arrangement of the computers on the network which is based on the computing model is called network architecture.
Its types are
a)      Client / Server Network
b)     Peer to Peer Network

64)  What do you mean by centralized computing network.
Ans: A centralized computing network is a network in which a central host computer performs data processing and storage on behalf of clients.

65)  What is client/server network?
Ans: Client/ server network is a type of network architecture that consist of at least one server and one or more workstations.

66)  What is peer-to-peer network?
Ans: A peer to peer network is a group of computers that function as both client and server.

67)  Differentiate between client/server network and peer-to-peer network.
Client/Server network
Peer-to-peer network
It consists of at least one server and one or more client.
It is a group of computers which function both as server and workstation.
It provides high security of data and other resources.
It provides no reliable security and might put data under risk.

68)  Write down the disadvantages of client server.
Ans: The disadvantages are:
i) It is more expensive than peer-to-peer.
ii) A well-trained network administration is required to manage network.

69)  Write down the disadvantages of peer-to-peer.
Ans: The disadvantages are
i) The expansion of network is limited.
ii) It tends to slow down with network load.

70)  What is router?
Ans: A router is an intelligent network device which connects multiple networks that uses the same protocol and forwards data packets from one network to another.

71)  What is NIC?
Ans: A Network Interface Card (NIC) is the adapter through which the computer is connected to the network.

72)  Write down the function of NIC.
Ans: The function of NIC is to convert data into electronic signals and transfer them through cables and vice-versa.

73)  What is cable?
Ans: Cables are commonly used media of physical channel for transmitting data between computers in network.

74)  What is connector?
 Ans: Connector is an interface between the NIC of the computer and the cable that passes data between computers in network.

75)  Write down the main function of NIC?
Ans: The main function of NIC is to act as the interface to connect the computer to network and control the flow of data in computer network.

76)  What is hub?
Ans: A hub is a network device that joins multiple computers or other network devices together to form a segment of computer network.

77)  What is switch?
Ans: A switch is a network device that connects computers, network devices and LAN segments.

78)  What is gateway?
Ans: Gateway is a dedicated server that connects two networks having dissimilar communication protocols.

79)  What is repeater?
Ans: Repeater is a device that amplifies the incoming signals, creates a copy of it and transmits the signal on network.

80)  What is MODEM?
Ans: MODEM is a device which is used to transfer the data of one computer to another computer using telephone lines.

81)  What is the role of MODEM in data transmission?
Ans: The role of MODEM in data transmission is that it transfers data from one computer to another through telephone line. It also converts the digital signal into analog and vice versa.

82)  Write down the importance of MODEM.
Ans: The importance of MODEM are:
·        Access internet
·        Perform modulation and demodulation process
·        Transfer data from one computer to another through telephone line

83)  What is modulation?
Ans: The process of translating digital signals of a computer to analog signals, which are then transmitted across the standard telephone lines, is known as modulation.

84)  What is demodulation?

Ans: The process of translating analog signals from a phone line and converts then into digital signals for the computer is known as demodulation.

1)     What is device driver?
Ans: Device driver is a program that controls the functionality of the hardware device.

75 Technical Terms

1.      Group of computers that can share resources in between computer.
2.      Network sharing and exchanging information between different people.
3.      A computer network limited within a room.
4.      A card used to connect network cable to computer.
5.      A device that forwards signals between networks in networks in network traffic.
6.      Medium that carries data without physical path.
7.      A hardware device that provide common wiring point in LAN.
8.      The computer that acts the central authority on a network.
9.      Device used to convert analog to digital signals and vice versa.
10.   A private internet.
11.   Network confined to relatively small area.
12.   Mode of data transmission in which transmission exist in both directions at a time.
13.   Network in which every computer acts as both client and server.
14.   Device to amplify or regenerate digital signals received.
15.   A group of the interconnected computers.
16.   A path through data is transmitted from one computer to another.
17.   The amount of data transmitted per second through a communication channel.
18.   A network of computers formed by using cables.
19.   A network of computers formed by using unguided media.
20.   A transmission medium through which data are transmitted in the form of light.
21.   A computer on the network that provided resources to other computers on the network.
22.   A computer on the network that uses resources of the network.
23.   An operating system used in a server computer.
24.   A network device that retransmits signals to all nodes on the network.
25.   A network device that retransmits signals to a destination node on the network.
26.   A network device that connects the segments of the same or different network having same protocol.
27.   A network device that can determine the best path for forwarding the data packets.
28.   A network device that joins networks having different protocols.
29.   The conversion of digital signals into analog signals.
30.   The conversion of analog signals into digital signals.
31.   The network model where there is at least one server.
32.   The network model where each node has equal right.
33.   The cabling pattern of computers where each computer is connected to a common cable in the linear format.
34.   The cabling pattern of computers where all nodes are connected in a closed loop.
35.   The cabling pattern of computers where each node is individually connected to centrally located device.
36.   A network model in which resources sharing, processing and communication control are completely decentralized.
37.   A large computer network that spans a metropolitan area or campus.
38.   A network topology in which network nodes are arranged in a linear format, with each nodes connected directly to the network cable with a T-connector or tap.
39.   A mode of transmission in which data flows in both directions, but only from one direction at a time.
40.   The protocol used for transferring hypertext documents that make the World Wide Web possible.
41.   A network device that connects dissimilar networks.
42.   A computer circuit board or card designed to allow computer to communicate over a computer network.
43.   A set of rules or procedures for transmitting data between electronic devices, such as computer.
44.   A self-contained network that spans a small area such as single building, floor, or a room.
45.   A device, software, or a system that converts data between dissimilar networks with different protocols.
46.   The modes of transmission in which communication takes place from both the sides simultaneously.
47.   The interconnection between two or more computers through physical and logical components to share resources.
48.   The computer on which users run applications.
49.   A network which is extended beyond the boundary of countries.
50.   A device with multiple ports that joins multiple computer together.
51.   The software which controls and manages all the operation in computer network.
52.   The computer that controls and coordinates all the activities of the entire computer in a network.
53.   The physical interface between cabling and network places.
54.   The topology in which all the computers are connected by a common distribution channel.
55.   The device which accepts weak signals regenerates them and sends them back on their way.
56.   The physical layout or cabling structure of computers on Local area network.
57.   The device that connects communication media with network devices.
58.   An intelligent device that connects two different networks by setting best network traffics.
59.   The device which connects similar networks having same protocols.
60.   A network of computer that cover whole world.
61.   A network structure where all computer on the network are connected through a centrally located device.
62.   A multiple port repeater.
63.   Sending or receiving information between two or more persons.
64.   A system of transmission of sounds, images, texts or data in the form of electronic signals.
65.   The path through which the sender makes communication to the receiver.
66.   Terms used to describe the data handling capacity of a communication system
67.   The data or signals transmitted through the air in the communication.
68.   The arrangement or connection patterns of computers or nodes and other devices of the network.
69.   Interface between the NIC of the computer and the cable that passes data from one computer to another computer.
70.   A device that amplifies the incoming signals creates a new copy of it and transmits the signals on the network.
71.   A device used to transfer the data of one computer to another using a telephone line.
72.   A set of rules that governs how computer exchange information over computer network.
73.   A computer in a network which can provide services to other computer
74.   Hub or switch based network topology.
75.   A main computer in the computer network.

1.Computer Network
2.Computer Network
6. Unbounded Media
7. HUB
12.Full duplex mode
13.Peer-to-Peer Network
15.Computer Network
16.Communication Medium
18.Wired Network
19.Wireless Network
20.Fiber Optic Cable
31.Client Server Network
32.Peer-to-Peer Network
33.Bus Topology
34.Ring Topology
35.Star Topology
36.Peer-to-Peer Network
38.Bus Topology
39.Half-Duplex Mode
46.Full-Duplex Mode
47.Comuter Network
54.Bus Topology
56.Network Topology
61.Star Topology
67. Unguided Media
74.Star Topology

80 Multiple Choice Questions
80 Multiple Choice Questions
1.      Which of the following networking solution is suitable for networking within a building?
i) WAN                        ii) LAN                 iii) MAN              iv) None of above
2.      Which of the following topologies share a single channel on which all stations can receive and transmit the data?
i) LAN                         ii) BUS                 iii) TREE              iv) None of the above
3.      Protocols in network means
i) Language for communication between computer    ii) Rules for exchange of message between two or more hosts
iii) Both i) and ii)                      iv) None of the above
4.      A server in LAN is a
i) Device offering service to user                        ii) NIC                 
iii) Workstation with huge secondary storage   iv) None of the above
5.      Which is not a physical component of computer network ?
i) Cable                        ii) NIC                  iii) Network OS                 iv) Hub
6.      Which of the following topologies is least affected by addition/removal of a node?
i) Star                           ii) Ring                 iii) Bus                 iv) None of the above
7.      The device used for connecting PC to telephone line is
i) CD-ROM                 ii) MODEM                        iii) Printer                           iv) Port
8.      Which of the following is used to connect  totally dissimilar networks?
i) Router                      ii) Bridge                            iii) Gateway                       iv) None of the above
9.      Which is not a network device?
Hub                                      Repeater                             switch                                  TCP/IP
10.   Fastest and high bandwidth data communication medium is:
Optical fiber                       Twisted Pair                       Coaxial Cable                    Telephone Line
11.   Which is not the network operating system:
Linux                                   UNIX                                   MS-DOS                             Windows Server 2012
12.   Which transmission media is not used for guided transmission media?
Fiber Optic                                 Coaxial Cable                    RJ45                                    Satellite
13.   Which type of network is used in the internet?
LAN                                    MAN                                   GAN                                    WAN
14.   Which refers to the communication media:
UTP Cable                          Fiber optics cable              Satellite                All of above
15.   Which is not a network topology?
STAR                                   Ring                                     Client Server                      BUS
16.   Which is not a guided media?
UTP Cable                          STP Cable                           Satellite                               Fiber Optics
17.   Modem converts ______________
Sound into digital              Digital signal into sound  Both (i) and (ii)                 None of above
18.   Which is not a communication media?
Wire                                    Microwave                         Satellite                NIC
19.   In which topology network is connected to hub?
Ring Topology                   Bus Topology                    Star Topology                    None
20.   Data communication means:
                           i.          We can easily send and receive the message                           Data computing system is fastest in network
                          ii.          The process of transferring data and information                   None of above
21.   The term network basically refers to:
Communication                                Interconnection                                Sharing                                All of them
22.   Which of the following are is not a goal of computer networks?
Resource sharing                              High reliability                                 Scalability               None of the above
23.   The network architecture used in most home networks is:
Client-server LAN                           Peer-to-peer LAN              Client-server WAN               Peer-to-peer WAN
24.   The maximum speed at which data can be transmitted between two nodes on a network.
Bit rate                                               Bandwidth                          Band length                        None of them
25.   __________ is the main line of defense between a local network or intranet and the Internet.
USB port                             Encryption key                                 Firewall                Decryption key
26.   Which is the network operating system?
MS-DOS                                    Windows 7                                        MS-UNIX                   Windows NT
27.   Microwave and Infrared technology are related with:
Unbounded media             Bounded Media                                Confounded                       Hot Bounded
28.   An example of guided media_______
Radio wave                        Infrared                                              Fiber Optics                       Micro wave
29.   Devices installed on long cable runs to amplify the signal are called:
Repeaters                            Adapters                                            Switches                             Routers
30.   A network navigation device that merely retransmits a signal to all other nodes attached to it:
Router                                 NIC                                                     Hub                                      Adapter
31.   Physical layout of computer:
Network                              Topology                                           LAN                                     MAN
32.   Token passing system is used in _____ topology.
Star                                      Ring                                                    Bus                                      Mesh
33.   Which of the following is protocol?
TCP/IP                                 HTTP                                                  FTP                                      All of them
34.   _______ is the protocol used to send email:
HTTP                                   SMTP                                                 POP                                      FTP
35.   Which one of the device is simplex?
i. Television                ii. Telephone                      iii. Computer                      iv. Walkie-Talkie
36.   The bandwidth of digital signal is measured in­_
i. Hertz                                        ii. Cycle per second          iii. Bits per second            iv. None of the above
37.   Which is not the guided  medium?
i. UTP                                          ii. STP                                  iii. Microwave                   iv. Fiber optic cable
38.   Which is the connector of UTP cable?
i. BNC                                         ii. T-Connector   iii. ST connector iv. RJ-45 connector
39.   Which is the network operating system used in a server computer?
i. Windows XP           ii. Windows Vista              iii. Windows NT server    iv. None of them
40.   A dedicated server that manages printers and printing jobs is_
 Network Server         ii. Printer Server iii. Modem Server             iv. File Server
41.   A networking device that joins multiple networks having different protocols is_
 Switch                         ii. Router                             iii. Gateway                        iv. Bridge
42.   Which is not the network protocol?
 TCP/IP                        ii. STP                                  iii. FTP                 iv. SMTP
43.   A group of computers that functions both as a client and as a server.
                              Centralized computing          ii) Client/server            iii) Peer-to-peer          iv)Local Area Network
44.   A telecommunication network, usually used for connecting computers, that spans a wide   geographical area.
                              i) LAN                                   ii) MAN                   iii) CAN                               iv) WAN
45.   The communication protocol used to connect to web servers on the internet or on a local network (intranet).
                                i) TCP/IP                        ii) HTTP                  i) SMTP                             iv) POP
46.   A form of wireless transmission in which signals are sent via pulses of infrared light.
                             i) Radio networking   ii) Infrared transmission  iii) Microwave transmission  iv) None of the above   
47.   A specialized network device on a host-based network that transmits the data entered by the user to the host for processing and displays the results.
i. Client                         ii. Network Server                           iii. Terminal                       iv. None of the above
48.   A data communications system allowing a number of independent devices to communicate directly with each other, within a moderately sized geographic area.
i.LAN                           ii.WAN                 iii. MAN                                iv.CAN
49.   A topology with a single cable that connects all the workstations, servers, printers and other devices on the network.
i. Ring Topology           ii. Bus Topology                            iii. Star Topology     iv. Mesh Topology
50.   A device that lets you link two networks together.
i. Switch                      ii. Hub                  iii. Router           iv. None of above

51.   Any network device that can connect to the network and can generate ,process or transfer network data.
i) Node                                       ii) Client                                            iii) Peer
52.   A network interface card is the card that physically makes the connection between the computer
and the network cable.
i) Network cables                     ii) Network connector              iii) NIC
53.   A centralized computing network is a type of network where  all the users connect to a host computer that is the acting agent for all communication.
i) Peer-to peer                           ii) Client/server                  iii) None of the above
54.   A network of computer spread over a city or town located in the same geographical area.
i) LAN                                        ii) MAN                              iii) WAN
55.   A device that converts the discrete stream of digital ON-OFF electric pulses used by computer into the continuously variable analog wave patterns used to transmit the human voice over many existing telephone lines.
i) Modem                                   ii) Bridge                                           iii) Gateway
56.   Which of the following acts as the central authority in the network?
protocol    ii.client                            iii.server     iv.none of the above
57.   which of the following is not Media connector?
BNC             ii. terminator    iii.RJ-45            iv.NIC
58.   In which of the following network model all the computers have equal access?
i. Peer-to-peer network              ii. apple talk network
iii. Client/server network            iv. None of the above
59.   Which of the following device is multi ports repeater?
Hub              ii. router         iii. bridge          iv. gateway
60.   Which of the following is not a protocol?
TCP/IP        ii.IPX/SPX      iii.NETBIOS/NETBUI        iv. Client
61.   The speed of Modems is measured in terms of
mbps                 ii.bps         iii. kbps                 iv. bits
62.   Which of the               following topology uses hub as compulsory device
star topology   ii. Bus topology      iii. Ring topology            iv. None of the above
63.   Which is not network hardware component?
HUB           ii. Repeater  iii. Router            iv. Windows NT
64.   Which is not a network protocol?
i. TCP/IP      ii. HTTP      iii. LAN      iv. FTP
65.   Which is the component of a network?
i. MSDOS      ii. Hub      iii. Volt guard      iv. None of them
66.   Which is the connector of coaxial cable.
i. RJ 45      ii. BNC      iii. ST      iv. None of them

67.   TV broadcasting is an example for data transmitting
i. Half-duplex Mode   ii. Simplex Mode   iii. Full duplex mode   iv. None of them
68.   A _______ is a self-sufficient computer that acts both as a server and a client to other similar computers on the network.
i. Node          ii. Client                              iii. Peer
69.   A network in which a central host computer performs data processing and storage on behalf of clients.
i. Centralized computing network                        ii. Client/Server network  iii. Peer-to-peer network
70.   Which refers to the communication media?
i. UTP cable                ii. Fiber optic cable                          iii. Radio wave    iv. All
71.   Which is Network operating system(NOS)?
i. Linux                        ii. Windows XP                                 iii. MS-DOS         iv. All
72.   Which refers to the communication media?
i) UTP cable                ii) Fiber optic cable          iii) Satellite         iv) All of the above
73.   Which of the following is not a protocol?
i) POP           ii) TCP/IP             iii) NOS                iv) FTP
74.   In which communication media data transfer high?
i) Twisted pair            ii) Co-axial cable              iii) Fiber optics   iv) Microwave
75.    Which is not unguided media?
i) Fiber optics             ii) Microwave     iii) Infrared          iv) Radio wave
76.   Which one is bounded media?
i) Fibre optics             ii) Microwave     iii) Infrared          iv)Laser
77.   Which one is an operating system software?
i) MS-Word ii) MS-Excel        iii) Firefox           iv) MS-DOS
78.   Which is NOT a guided media?
i) UTP Cable               ii) STP Cable       iii) Satellite         iv) Fiber Optics
79.   Which one is an example of bounded media?
i) Fiber optics             ii) Microwave transmission            iii)Laser transmission       iv) infrared transmission
80.   Each computer on the Internet has a unique numeric address called a/an ….
i) Web address           ii) Domain address            iii) Network binding         iv) IP address

3.Both i) and ii)
4.Device offering service to user
5.Network OS
6. Star
10.Optical fiber
14.All of above
15.Client Server
17.Both i) and ii)
19.Star Topology
20.The process of transferring data and information
21.All of them
22.None of above
23.Peer-to-peer LAN
26.Windows NT
27.Unbounded media
28.Fiber optics
33.All of them
36.Bits per second
39.Windowas NT Server
40.Printer Server
46.Infrared transmission
49.Bus Topology
50.None of above
53.None of above
62.Star Topology
63Windows NT
67.Simplex Mode
69.Centralized computing network
72.All of the above
74.Fiber optics
75.Fiber optics
76.Fibre optics
79.Fiber optics
80.IP address
80 True and False Questions
1.      It is possible to share hardware resources on a computer network.
2.      In client/server network architecture the resources are distributed to different terminals.
3.      Nodes are also called workstations.
4.      Network interface card connects printers on the network.
5.      Star topology uses a single cable as a backbone from where all other nodes are connected.
6.      It is difficult to identify and isolate the failure node in ring topology compared to star topology.
7.      There is possibility producing more crosstalk in twisted pair cable than coaxial cable.
8.      WAN uses guided transmission media like microwave or radio wave.
9.      Bridge connects two dissimilar networks and carried out protocol conversion if needed.
10.   Normally there is more transmission error rate in unguided transmission media than guided transmission media.
11.   A computer network is just used for resource sharing.
12.   The computer networking cannot be implemented within room.
13.   The network that covers small area is called PAN.
14.   Fiber optics uses light to carry a data signal through cable.
15.   Computer network is basically connection of computers.
16.   Computer network cannot transfer multimedia contents.
17.   Duplex device can transfer data in both directions.
18.   Computer Network can share both hardware and software resources.
19.   Guided transmission media does not use cables.
20.   RJ-45 is the connector for co-axial cable.
21.   Data are transmitted in the form of light in the fiber optic cable.
22.   Router is a network component that regenerates electric signals.
23.   Bus topology requires more media than other topology.
24.   STAR topology is the most popular network topology used to connect computers.
25.   Protocol is the computer language only understood by computer.
26.   Fiber optic is one of the cheapest networks.
27.   A bridge is a network device that connects different LAN segments using the same access method.
28.   Connecting computer between two different countries is an example of WAN.
29.   Protocol is required to transfer data between two computers.
30.   A MODEM is a central network device that connects network devices in a star topology.
31.   In the wired network, computers are connected with each other through wires.
32.   Microwave signals travel in straight line and cannot pass through obstacles like buildings, hills, etc.
33.   A hub is also called multiport repeater.
34.   Multiple bridges can be used to form a large network by connecting several small networks.
35.   A repeater is a network device that regenerates electric signals.
36.   In the  star topology computers must be arranged in the form of star.
37.   A network computer allows sharing of networked connected peripherals and simultaneous access to programs and data irrespective of the physical location of the resources and the user.
38.   Network operating system is a formal description of messages formats and the rules that two or more machines must follow to exchange those messages.
39.   Wide Area Network is a large computer network that spans a metropolitan area or campus.
40.   Wireless Access Point is a device that provides connection between wireless devices and can connect to wired networks.
41.   Modem is a network device that connects dissimilar networks with different protocols.
42.   Networked computers allow easy transfer of data from one computer to another.
43.   A node is the primary data path that can carry large amount of data traffic.
44.   A peer-to-peer network is a simple, inexpensive network designed to connect computers together using twisted pair cable or coaxial cable.
45.   A hub is a device that amplifies a signal being transmitted on the network. 
46.   Fiber optic transmitters and receivers are still relatively expensive compared to electrical interface.
47.   Computer network or data network is a telecommunications network that allows computer to exchange data.
48.   A node is a network computer that utilizes the resources of other network computer including other clients.
49.   A network connector is defined as a device that facilitates the connection or the interconnection of computers and other device to a network.
50.   HTTP is an internet based standard for retrieval of email by user from an email server.
51.   Wide Area Network (WAN) is a geographically dispersed telecommunication network.
52.   Communication is the process of sharing message from one point to another._
53.    In half duplex mode of communication, data can be transmitted in both directions simultaneously.
54.    Metropolitan Area Network connects two or more LAN together with in a large city or state.
55.   Coaxial cable has much greater bandwidth than fiber optic cable.
56.    A gateway is a network device which connects two dissimilar networks together.
57.    Each computer or device in a network is called node.
58.    Peer-to-peer is a network model which has more security than client server.
59.   Computer network only allows us to share computer hardware.
60.   A workstation is a computer that uses the service of the network.
61.   A computer network that covers small local area is MAN.
62.   Internet is an example of WAN.
63.   A server computer acts as the storehouse and distributer for the program data and information.
64.   You can send message from one computer to another computer on the network.
65.   Modem can convert digital signal into analog signal and vice versa.
66.   Protocols are no required to exchange data between two different computers.
67.   Fill duplex mode allows simultaneous transmission of data in both directions.
68.   Wire communication is suitable for Local Area Network.
69.   The router filters and forwards information among different networks.
70.   In a computer network, the data is passed from one computer to another by means of cables or satellites.
71.   A metropolitan area network (MAN) is a network of computers between two different cities.
72.   The computers in a network system share only software packages.
73.   Connecting computers between two different countries is an example of WAN.
74.   Computer network increases worker productivity and offers tremendous convenience.
75.   A server is a network computer that utilizes the resources of other network computers, including other clients.
76.   Local Area Network is a network that spans multiple geographical locations.
77.   A physical ring topology is a network topology in which network nodes are connected in a continuous circle.
78.   Router is a network device used to regenerate or replicate a signal.
79.   MODEMS are not needed in wireless network communication.
80.   HUB provides power backup in the event of power cut on the network system.

3. True
6. True
7. True
8. False
10. True
14. True
15. True
17. True
18. True
20. False
21. True
24. True
25. True
27. True
28. True
29. True
31. True
32. True
33. True
34. True
35. True
37. True
41. False
45. False
50. False
52. False
53. False
55. False
58. False
59. False
61. False
66. False
71. False
72. False
75. False
76. False
77. True
78. False
80. False

35 Fill in the Blanks
1.      The interconnection of computers with or without wires in order to share information is called __________________
2.      The ______________ computer is used to server data and information.
3.      The smallest area covers by network is called _______________
4.      The ____________ which uses information from the server.
5.      The wireless technology used for long distance is called _________________
6.      A set of rules used to define communication is called ____________________
7.      The remote login protocol is _________________
8.      Both directional communication at the same time is called ______________ mode of communication
9.      A_______________is a computer designed to process requests and deliver data to other (client) computers over a Local Network or the Internet.
10.   _______________is a set of rules that governs the communications between computers on a network.
11.   A _______________is a network that interconnects users with computer resources in a geographic area or region larger than that covered by even a LAN but smaller than the area covered by a WAN.
12.   _______________is a hardware device used to connect several computers  together.
13.   _______________ is a device connecting two or more networks that facilitates the transfer of data in the form of packets.
14.   A _________________is a group of computer systems and other computing hardware devices that are linked together through communication channels to facilitate communication and resource- sharing among a wide range of users.
15.   A_________________is a self sufficient computer that acts both as a server and a client to other similar computers on the network.
16.   A_________________network is a group of computers that function both as client and server.
17.   The interconnection of computer with or without wire is known as_______________.
18.   The _______________computer acts as the storehouse and distributor for the data, information and programs.
19.   A computer on a network that uses resources of the network is _______________.
20.   The network if computer within the room, building or campus is_______________.
21.   The computer network of any two countries is_______________.
22.   The example of WAN is _______________ .
23.   Telecommunication is a system of transmission of sounds, images, texts or data in the form of                                                                                  ____________________.
24.   Modes for transmitting data from one device to another are simple, Half-duplex, and ______________mode.
25.   Bandwidth is measured in ______________________.                                                         .
26.   Cat 5 cable is used with_____________ connector.
27.   Microwave is a __________________that can be used to transmit data between two different computers.
28.   _____________________ is a communication system connecting two or more computer that work together to exchange information and share resources.
29.   ______________________ is a transmission of data and information between computers using a communication link such as a standard telephone line.
30.   A ___________ network is a network in which a central host computer performs data processing and storage on behalf of clients.
31.   A ______________________ refers to the shape of the network in which all the computers are connected together.
32.   A physical ________________ topology is a network topology in which network nodes are connected in a continuous circle.
33.   ___________________ mode communication is a mode of transmission in which data flows in one direction only.
34.   __________________ is a device software or a system that converts data between dissimilar network with different protocols.
35.   _________ means two-way communication system.

1.Computer Network
4.client computer
5.microwave transmission
6. protocol
7. telnet
13.Router network
16.peer-to-peer network
23.electronic signals
27.wireless technology
28.Computer network
25 Match the Following
Server                                  HTTP                                                                        
Node                                    Work Station                                                                              
Protocol                              Main Computer                                                                          
Coaxial Cable                    Set of rules
Communication Media
Protocol                                             MODEM
WAN                                   Fiber Optic
Network component         HTTP
Transmission media          Internet

Coaxial Cable                    RJ45
Optical Fiber cable           BNC
Twisted Pair                       ST
Telephone Wire                 RJ11

Star                                      Powerful computer
WAN                                   Computers on the network provided to users
Server                                  Internet
Node                                    Topology

Host computer                   A computer circuit board
NIC                                      A self-sufficient computer
Windows NT                      A powerful, centralized computer system
TCP/IP                                 Popular network operating
Peer                                     Node
Network protocol

Computer network            Windows NT
Network OS                        HTTP
Transmission channel      Resource Sharing
Protocol                                             UTP
Wi-Fi                                   Network within a building
Linear Bus                          Software component
BNC                                   Topology
Device Driver                    Transmission Media
                             Media connector         
Protocol                                             Network within a building.
LAN                                     BNC
MAN                                   RJ-45
Coaxial                               Central device for star topology.
Cat 5                                    Rules to exchange data.
Hub                                      Network within a city.

Radio Wave                       Device to connect network having different technology
Cyber ethics                       power protection device
Spike guard                        internet
Gateway                                             professionally guided principles
                                             Wireless media

Server                                  HTTP
Node                                    Work station
Protocol                                             Main computer
Coaxial cable                     Repeater
                                             Communication Media
T-connector                       Network
Bridge                                 Power protection
CD-ROM                            Coaxial  cable
Spike Guard                       Multimedia component
                                             Virus scanning
Satellite                               Multimedia
HTTP                                   Protocol
Online business                 Unguided media
Fiber optics                        E-commerce

Microwave                         Multimedia
Volt guard                          Protocol
Sound card                         Unguided media
TCP/IP                                 Power protection devices
                                             Guided media
 RJ-45                                  Multimedia
WAN                                   Duplicate copy
Back up                               Fiber optic cable
Microphone                       Twisted pair cable

Combination of several media       Guided Media
POP                                                     Power Protection Device
UTP                                                    Multimedia
UPS                                                     Protocol used in e-mail

E-commerce                       Power protection device
Volt guard                          Online shopping
Satellite link                       WAN
Sound card                         Optical fiber

McAfee                               Supplies continuous power
UPS                                      Internet protocol
Web Browser                     Antivirus software
TCP/IP                                 Internet explorer
                                             Computer virus

Bandwidth                          ISP
Internet                               FAT
 Network                             bps
 Software security             NAV

Pictures in motions           Guided media
TCP/IP                                 animation
UTP                                     Random Access Memory
Volatile memory                              CD-ROM
                                             Protocol used in Internet
LAN                                     Within a city
MAN                                   Internet protocol
UPS                                      Within a city
IPX/SPX                              Power supply device
                                             Between countries

Sound card                         WAN
Virus                                   Internet explorer
Web browser                      Multimedia
Satellite link                       damage or corrupt data
TCP/IP                                 Multimedia
Back up                               Web address
Sound card                         Software security
URL                                     Protocol
Node                                    a network computer that utilizes the resources of other computer
Client                                  a set of rules by which computers communicate with each other over a network
Host                                     a self-sufficient computer that acts both as a server and a client(shares and uses resources
Peer                                     any network device that can connect to the network and can generate, process or transfer network data
Protocol                              the most powerful type of computer on the network, that does all the processing for the user

Ring topology                    A group of computers that functions both as a client and server.
Simplex connection          A group of computers and associated devices that share a common communications line or wireless link.    
Peer-to peer  network       A network topology in which network nodes are connected in continuous circle.      
Fiber optic cable               A connection in which the data flows in only one direction from the transmitter to the receiver.         
Local area network           A network cable that contains stands of glass fibers inside an insulated casing

TCP/IP                                 Addressing data, converting them into packets and Routing
FTP                                      Transfer mail and attachment on the network
POP                                      Transfer files between two computers
SMTP                                  Fetching mails from the mail server to a user’s computer

3.C, A, B, D
4.C, -, D, B, A
5.B, E, A, C, -, D
6. B,D,A,C,-
7. –,D,B,A,C