mcq on computer networks with answers pdf

 1. In fiber optics, the signal source is ___ waves.

A. light

B. radio

C. infrared

D. very low frequency



2. The ___ layer is responsible for node to node packet delivery.

A. session

B. network

C. physical

D. data link



3. The speed mismatch between the sender and the receiver is called ___.

A. error control

B. speed error

C. flow control

D. transmission control


4. FTP runs exclusively over ___.

A. HTTP

B. TCP

C. SMTP

D. HTML


5. BSC is developed by ___.

A. Motorola

B. IBM

C. Nokia

D. Toshiba



6. Which of the following primarily uses guided media?

A. cellular telephone system

B. local telephone system

C. satellite communications

D. radio broadcasting


7. When we talk about unguided media, usually we are referring to ___.

A. metallic wires

B. nonmetallic wires

C. the atmosphere

D. None of the above


8. This is the ability to increase system performance gradually as the workload grows just by adding processors.

A. multipliability

B. inheritance

C. scalability

D. vectorization



9. PSTN represents ___.

A. private switched transmission network

B. public switched telephone network

C. private switched telephone network

D. public switched transmission network



10. SMTP refers to ___.

A. Simple mail transfer protocol

B. Small mail transfer protocol

C. Simple mass transfer protocol

D. Small mail transfer protocol



11. Class A, Class B, and Class C together are referred to as ___addressing or primary address class if the IP.

A. classful

B. eventful

C. graded

D. ranked

Ans: a


12. ___ overcame the registered number issue by assigning each organization one network number from the IPv4 address space.

A. Tracking

B. Subnetting

C. Packeting

D. Switching


13. Equipment that controls the physical and electrical termination of the ISDN at the user’s premises is called ___.

A. NT1

B. NT2

C. NT3

D. NT4



14. A data channel contains ___.

A. control information

B. management information

C. miscellaneous functions

D. user data/information


15. QOS represents ___.

A. Quality of System

B. Quality of Service

C. Queue of System

D. Queue of Service



16. ISDN is an acronym for ___.

A. Information Services for Digital Networks

B. Internetwork System for Data Networks

C. Integrated Services Digital Networks

D. Integrated Signals Digital Network



17. Data rate depends on three factors

A. Bandwidth available

B. Level of the signals we use

C. Quality of the channel

D. All of the above


18. Which layer is not really a layer?

A. Host of the network

B. Network to host

C. Application to presentation

D. None



19. Reference point ___ is the specification for connecting NT1 with NT2.

A. R

B. S

C. T

D. U


20. The radio communication spectrum is divided into bands based on ___.

A. amplitude

B. frequency

C. cost and hardware

D. transmission medium



21. Which international agency is concerned with standards in science and technology?

A. ISO

B. OSI

C. EIA

D. ANSI



22. ___ blocks are identified using syntax similar to that of IPv4 addresses: a four-part dotted-decimal address, followed by a slash, then a number from 0 to 32: A)B)C)D/N.

A. IPv4 CICR

B. IPv4 MIDR

C. IPv4 CIMR

D. IPv4 CIDR



23. The term “e-mail” applies both to the Internet e-mail system based on the ___ and to ___ allowing users within one organization to e-mail each other.

A. FTP, Intranet Systems

B. SMTP, Intranet Systems

C. FTP, Internet Systems

D. SMTP, Internet Systems



24. Which agency created standards for telephone communications (V series) and for network interfaces and public networks (X series)?

A. ATT

B. ITU-T

C. ANSI

D. ISO


25. ___ CSMA is less greedy whereas ___ CSMA is selfish.

A. Non-persistent, 1-persistent

B. 1-persistent, p-persistent

C. p-persistent, 1-persistent

D. 1-persistent, non-persistent


26. The BRI is composed of ___.

A. two B channels

B. one H channel

C. one D channel

D. a and c


27. IP Packet is a ___ and ___ based model.

A. connectionless, network

B. connection, network

C. connectionless, datagram

D. connection, datagram



28. ___ are special-interest groups that quickly test, evaluate, and standardize new technologies.

A. Forums

B. Regulatory agencies

C. Standards organizations

D. All of the above



29. When the angle of refraction is ___ the angle of incidence, the light beam is moving from a denser to a less dense medium.

A. more than

B. less than

C. equal to

D. none of the above.



30. For downlinks, current design practice is to use a minimum elevation angle of about ___ degrees to ___ degrees depending on the frequency.

A. 45 , 90

B. 40, 60

C. 10, 35

D. 5, 20



31. The ALOHA network was created at the University of ___ in 1970 under the leadership of ___.

A. Hawaii, John Abramson

B. Texas, John Abramson

C. Texas, Norman Abramson

D. Hawaii, Norman Abramson


32. The term used to describe the way in which computers are connected to the network.

A. Logic

B. Technology

C. Topology

D. All of the above


33. FDM stands for

A. Fixed division multiplexing

B. First division multiplexing

C. Frequency division multiplexing

D. None



34. FDDI stands for

A.Fixed distributed data interface

B. First division data interface

C. Fiber distributed data interface

D. None



35. The ___ layer is responsible for resolving access to the shared media or resources.

A. physical

B. MAC sub layer

C. Network

D. Transport


36. Coding can be divided into

A. Block coding

B. Convolution coding

C. Both of the above

D. None of the above


37. Fiber-optic communication system uses.

A. Simplex transmission

B. half-duplex

C. full-duplex

D. None of the above


38. Complex routing strategies can be, and are, often used in systems such as ___, ___, or ___, which are sometimes used as underlying technologies to support IP networks.

A. MPLS, ATM, or Frame Relay

B. CTLNS, ATM, or Slot

C. ATM, PDTN, or Slot

D. LAN, ATM, or Frame Relay


39. The concept of connected computers sharing resources is called ___.

A. Internetworking

B. Intranetworking

C. Networking

D. None of the above



40. VPN stands for

A. Virtual Private Network

B. Visual private network

C. Virtual public network

D. Visual public network


41. IMP stands for

A. Internal message passing

B. Interface message passing

C. Internal message parsing

D. Interface message parsing


42. Process to process delivery of the entire message is done by

A. Physical layer

B. Transport layer

C. Session layer

D. Presentation layer



43. Dialog controller role is played by

A. Session layer

B. Application layer

C. Transport layer

D. Network layer

Ans: a


44. Syntax and semantics of the information exchanged between two systems is done by

A. Session layer

B. Application layer

C. Transport layer

D. Presentation layer



45. SDU stands for

A. Service data unit

B. Service digital unit

C. Session data unit

D. Session data unit



46. PDU stands for

A. Power data unit

B. Protocol digital unit

C. Presentation data unit

D. Protocol data unit



47. Transmission lines suffer from the major problem

A. Attenuation distortion

B. Delay distortion

C. Noise

D. All of the above



48. If the value of a signal changes over a very short span of time, its frequency is ___

A. Low

B. High

C. Average

D. Zero



49. CRC stands for

A. Cyclic redundancy codes

B. Code redundancy cycle

C. Critical redundancy cycle

D. None of the above



50. In ___ type of service, no connection is established beforehand or afterward.

A. acknowledged connectionless service

B. Unacknowledged connectionless service

C. acknowledged connection-oriented service

D. Unacknowledged connection-oriented service



 51 Computer Network is


A. Collection of hardware components and computers

B. Interconnected by communication channels

C. Sharing of resources and information

D. All of the Above


52. Protocols are?

A. Agreements on how communication components and DTE's are to communicate

B. Logical communication channels for transferring data

C. Physical communication channels sued for transferring data

D. None of above


​53. Two devices are in network if

A. a process in one device is able to exchange information with a process in another device

B. a process is running on both devices

C. PIDs of the processes running of different devices are same

D. none of the mentioned


54. what is a Firewall in Computer Network?

A. The physical boundary of Network

B. An operating System of Computer Network

C. A system designed to prevent unauthorized access

D. A web browsing Software


55. The IETF standards documents are called

A. RFC

B. RCF

C. ID

D. None of the mentioned


56. Which data communication method is used to transmit the data over a serial communication link?

A. Simplex

B. Half-duplex

C. Full duplex

D. All of above


57. Each IP packet must contain

A. Only Source address

B. Only Destination address

C. Source and Destination address

D. Source or Destination address


58. What is the minimum header size of an IP packet?

A. 16 bytes

B. 10 bytes

C. 20 bytes

D. 32 bytes


59. Routing tables of a router keeps track of

A. MAC Address Assignments

B. Port Assignments to network devices

C. Distribute IP address to network devices

D. Routes to use for forwarding data to its destination


60. Which of the following is not the External Security Threats?

A. Front-door Threats

B. Back-door Threats

C. Underground Threats

D. Denial of Service (DoS)


61. What is the IP Address range of APIPA?

A. 169.254.0.1 to 169.254.0.254

B. 169.254.0.1 to 169.254.0.255

C. 169.254.0.1 to 169.254.255.254

D. 169.254.0.1 to 169.254.255.255


62. Which of the following is not the possible ways of data exchange?

A. Simplex

B. Multiplex

C. Half-duplex

D. Full-duplex


63. The management of data flow between computers or devices or between nodes in a network is called

A. Flow control

B. Data Control

C. Data Management

D. Flow Management


64. What does the port number in a TCP connection specify?

A. It specifies the communication process on the two end systems

B. It specifies the quality of the data & connection

C. It specify the size of data

D. All of the above


65. What is the purpose of the PSH flag in the TCP header?

A. Typically used to indicate end of message

B. Typically used to indicate beginning of message

C. Typically used to push the message

D. Typically used to indicate stop the message


66. Which of the following protocol is/are defined in Transport layer?

A. FTP

B. TCP

C. UDP

D. B & C


67. The meaning of Straight-through Cable is

A. Four wire pairs connect to the same pin on each end

B. The cable Which Directly connects Computer to Computer

C. Four wire pairs not twisted with each other

D. The cable which is not twisted


68. What is the size of MAC Address?

A. 16-bits

B. 32-bits

C. 48-bits

D. 64-bits


69. Repeater operates in which layer of the OSI model?

A. Physical layer

B. Data link layer

C. Network layer

D. Transport layer


70. Which of the following layer of OSI model also called end-to-end layer?

A. Presentation layer

B. Network layer

C. Session layer

D. Transport layer


71. Router operates in which layer of OSI Reference Model?

A. Layer 1 (Physical Layer)

B. Layer 3 (Network Layer)

C. Layer 4 (Transport Layer)

D. Layer 7 (Application Layer)


72. ADSL is the abbreviation of

A. Asymmetric Dual Subscriber Line

B. Asymmetric Digital System Line

C. Asymmetric Dual System Line

D. Asymmetric Digital Subscriber Line


73. How many layers does OSI Reference Model has?

A. 4

B. 5

C. 6

D. 7


74 Bridge works in which layer of the OSI model?

A. Appliation layer

B. Transport layer

C. Network layer

D. Datalink layer


75. Why IP Protocol is considered as unreliable?

A. A packet may be lost

B. Packets may arrive out of order

C. Duplicate packets may be generated

D. All of the above


76. What is the benefit of the Networking?

A. File Sharing

B. Easier access to Resources

C. Easier Backups

D. All of the Above


77. Which of the following is not the Networking Devices?

A. Gateways

B. Linux

C. Routers

D. Firewalls


78. What is the maximum header size of an IP packet?

A. 32 bytes

B. 64 bytes

C. 30 bytes

D. 60 bytes


79. Which of the following is correct in VLSM?

A. Can have subnets of different sizes

B. Subnets must be in same size

C. No required of subnet

D. All of above


80. DHCP Server provides _____ to the client.

A. Protocol

B. IP Address

C. MAC Address

D. Network Address


81. What is the address size of IPv6 ?

A. 32 bit

B. 64 bit

C. 128 bit

D. 256 bit


82. What is the size of Network bits & Host bits of Class A of IP address?

A. Network bits 7, Host bits 24

B. Network bits 8, Host bits 24

C. Network bits 7, Host bits 23

D. Network bits 8, Host bits 23


83. What is the full form of RAID ?

A. Redundant Array of Independent Disks

B. Redundant Array of Important Disks

C. Random Access of Independent Disks

D. Random Access of Important Disks


84. What do you mean by broadcasting in Networking?

A. It means addressing a packet to all machine

B. It means addressing a packet to some machine

C. It means addressing a packet to a particular machine

D. It means addressing a packet to except a particular machine


85. What is the size of Source and Destination IP address in IP header?

A. 4 bits

B. 8 bits

C. 16 bits

D. 32 bits


86. What is the typical range of Ephemeral ports?

A. 1 to 80

B. 1 to 1024

C. 80 to 8080

D. 1024 to 65535


87. A set of rules that govern all aspects of information communication is called

A. Server

B. Internet

C. Protocol

D. OSI Model


88. Controlling access to a network by analyzing the incoming and outgoing packets is called

A. IP Filtering

B. Data Filtering

C. Packet Filtering

D. Firewall Filtering


89. DHCP is the abbreviation of

A. Dynamic Host Control Protocol

B. Dynamic Host Configuration Protocol

C. Dynamic Hyper Control Protocol

D. Dynamic Hyper Configuration Protocol


90. What is the use of Bridge in Network?

A. to connect LANs

B. to separate LANs

C. to control Network Speed

D. All of the above


91. Network congestion occurs

A. in case of traffic overloading

B. when a system terminates

C. when connection between two nodes terminates

D. none of the mentioned


92. What is the meaning of Bandwidth in Network?

A. Transmission capacity of a communication channels

B. Connected Computers in the Network

C. Class of IP used in Network

D. None of Above


93 Which of the following is correct regarding Class B Address of IP address

A. Network bit – 14, Host bit – 16

B. Network bit – 16, Host bit – 14

C. Network bit – 18, Host bit – 16

D. Network bit – 12, Host bit – 14


94. ............provides a connection-oriented reliable service for sending messages

A. TCP

B. IP

C. UDP

D. All of the above


95. What does Router do in a network?

A. Forwards a packet to all outgoing links

B. Forwards a packet to the next free outgoing link

C. Determines on which outing link a packet is to be forwarded

D. Forwards a packet to all outgoing links except the originated link


96. What is the use of Ping command?

A. To test a device on the network is reachable

B. To test a hard disk fault

C. To test a bug in a Application

D. To test a Pinter Quality


97. What is the size of Host bits in Class B of IP address?

A. 04

B. 08

C. 16

D. 32


98. Which of the following is correct in CIDR?

A. Class A includes Class B network

B. There are only two networks

C. There are high & low class network

D. There is no concept of class A, B, C networks


99. The processes on each machine that communicate at a given layer are called

A. UDP process

B. Intranet process

C. Server technology

D. Peer-peer process


100. Which of the following layer is not network support layer?

A. Transport Layer

B. Network Layers

C. Data link Layer

D. Physical Layer


Qestion NoAnswer
1A
2D
3C
4B
5B
6B
7C
8C
9B
10A
11A
12B
13A
14A
15B
16C
17D
18A
19C
20B
21A
22D
23B
24B
25A
26D
27C
28A
29A
30D
31D
32C
33C
34C
35B
36C
37B
38A
39C
40A
41B
42B
43A
44D
45A
46D
47D
48B
49A
50B
51D
52A
53A
54C
55A
56C
57C
58C
59D
60C
61C
62B
63A
64A
65A
66D
67A
68C
69A
70D
71B
72D
73D
74D
75D
76D
77B
78D
79A
80B
81C
82A
83A
84A
85D
86D
87C
88C
89B
90A
91A
92A
93A
94A
95C
96A
97C
98D
99D
100A



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