Computer Network Interview Questions and Answers

The old model of a single computer serving all of the organization’s computational needs has been replaced by one in which a large number of separate but interconnected computers do the job. These systems are called computer networks. so here we are including basic to advanced Computer Network Interview Questions and Answers for the preparation of University exams, coding competitions, and Interview preparations.

Protocols are

1. agreements on how communication components and DTEs are to communicate
2. logical communication channels used for transferring data
3. physical communication channels used for transferring data
4. none of the above

Answer – (1) agreements on how communication components and DTEs are to communicate

The method of communication in which transmission takes place in both directions, but only in one direction at a time is called

1. simplex
2. four-wire circuit
3. full-duplex
4. half-duplex

Answer – (4) half-duplex

The unmodulated signal coming from a transmitter is known as

1. carrier signal
2. baseband signal
3. primary signal
4. none of the above

Answer – (2) baseband signal

Match List-I with List-II and select the correct answer using the codes given below the lists:

List-I

Session layer
Transport layer
Application layer
MDI (Medium Dependent Interface)

List-II

connects DCE to the physical channel

provides end-to-end connectivity

provides organized means to exchange data between users.

(like synchronization points)

supports an end-user process and performs the required file transfer.

             A   B   C   D

1.    3   4   2   1
2.    3   2   4   1
3.    2   4   1   3
4.    4   3   2   1

Answer – (2) 3 2 4 1

The Hamming distance between 001111 and 010011 is

1. 1
2. 2
3. 3
4. 4

Answer – (3) 3

Choose the correct statements (s)

1. Baseband network uses analog technology
2. The Baseband network is Time Division Multiplexed
3. The broadband network uses digital technology
4. In a broadband network, the carrier signals operate at a lower frequency.

Answer – (2) Baseband network is Time Division Multiplexed

The _____________ measures the number of lost or garbled messages as a fraction of the total sent in the sampling period

1. Residual Error rate
2. Transfer failure probability
3. Connection release failure probability
4. Connection establishment failure probability

Answer – (1) Residual Error rate

Which of the following ISO level is more closely related to the physical communications facilities?

1. Application
2. Session
3. Network
4. Datalink

Answer – (4) Datalink

Which of the following is not a field in the Ethernet message packet?

1. Type
2. Data
3. Pin-code
4. Address

Answer – (3) Pin-code

In a broad sense, a railway track is an example of

1. simplex
2. half-duplex
3. full-duplex
4. all of the above

Answer – (2) half-duplex

The frequency range at which the LAN coaxial cables will be used is

1. 10^6 to 10^8 Hz
2. 10^10 to 10^11 Hz
3. 10^3 to 10^4 Hz
4. 10^14 to 10^15 Hz

Answer – (1) 10^6 to 10^8 Hz

Match the following

1. Data link layer	(i) the lowest layer whose function is to activate, deactivate and maintain the circuit between DTE and DCE
2. Physical layer	(ii) performs routing and communication
3. Presentation layer	(iii) detection and recovery from errors in the transmitted data
4. Network layer	(iv) concerned with the syntax of the data

1. 1-(iii), 2-(i), 3-(iv), 4-(ii)
2. 1-(ii), 2-(i), 3-(iv), 4-(iii)
3. 1-(iv), 2-(i), 3-(ii), 4-(iii)
4. 1-(ii), 2-(i), 3-(iii), 4-(iv)

Answer – (1) 1-(iii), 2-(i), 3-(iv), 4-(ii)

A device that can convert digital signals to analog signals is

1. a packet
2. a modem
3. an emulator
4. none of the above

Answer – (2) a modem

Auto dialing allows

1. you to dial a phone number by typing them on the keyboard
2. a personal computer to answer incoming calls without human assistance
3. both (a) and (b) above
4. none of the above

Answer – (1) you to dial a phone number by typing them on the keyboard

A network that requires human intervention to route signals is called a

1. bus network
2. ring network
3. star network
4. T-switched network

Answer – (4) T-switched network

A packed-switching network

1. is free
2. can reduce the cost of using an information utility
3. allows communications channels to be shared among more than one user
4. both (b) and (c) above

Answer – (4) both (b) and (c) above

Local area networks can transmit

1. faster than telecommunications over public telephone lines
2. slower than telecommunications over public telephone lines
3. using twisted-pair wiring or coaxial cables
4. both (a) and (c) above

Answer – (4) both (a) and (c) above

A T-switch is used to

1. control how messages are passed between computers
2. echo every character that is received
3. transmit characters one at a time
4. rearrange the connections between computing equipment

Answer – (4) rearrange the connections between computing equipment

Bulletin board system

1. is a public access message system
2. is a modem capable of accepting commands
3. converts analog signals to digital signals
4. coverts digital signals to analog signals

Answer – (1) is a public access message system

FDDI is

1. ring network
2. star network
3. mesh network
4. bus-based network

Answer – (1) bus-based network

Note – More questions and answers will be added from time to time.