Computer Networks Interview Questions and Answers

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MCQ on Computer Networks :

1.) Size of the logical record is

  1. 20780 bytes
  2. 31978 bytes
  3. 32767 bytes
  4. 32761 bytes
Answer is c)

2.) Size of XNS address is 

  1. 6 bytes
  2. 4 bytes
  3. 12 bytes
  4. 8 bytes
Answer is c)

3.) Fork() is to

  1. divide the process
  2. do fragmentation
  3. create child process
  4. pass the data
Answer is c)

4.) Size of transmission header

  1. 6 bytes
  2. 26 bytes
  3. 6 to 26 bytes
  4. 6 to 32 bytes
Answer is c)

5.) accept() system call returns

  1. A port number
  2. A socket descriptor
  3. An address
  4. An address structure
Answer is c)

6.) Closesocket() returns

  1. integer
  2. float
  3. char
  4. double
Answer is a)

7.) BSD is 

  1. Bell Software Descriptor
  2. Berkeley standard distribution
  3. The Berkeley socket descriptor
  4. Berkeley Software Distribution
Answer is d)

8.) Address conversion routines are

  1. inetaddr and sockaddr_in
  2. sockaddr_in and inet_ntoa
  3. inet_ntoa and inet_addr
  4. inet_ntoa and sockaddr
Answer is c)

9.) In winsock, method for error handling is

  1. WSAsocket
  2. WSAconnect
  3. WSAGetLastError
  4. getsockname
Answer is c)

10.) WSASendTo is to send 

  1. Data in the connection-oriented mode
  2. Data in the connection-less mode
  3. Control data
  4. ASCII data
Answer is a)


  1. 0
  2. 1
  3. -1
  4. Any positive integer
Answer is c)

12.) CF_DEFER is

  1. A value returned by socket()
  2. A value returned by bind()
  3. The value returned by connect()
  4. A value returned by condition function
Answer is d)

13.) Three operations that can be performed on routing sockets are

  1. Write, read and insert
  2. Write, read and delete
  3. The Write, read and sysctl
  4. Read, check and insert
Answer is a)

14.) Number of routing messages are

  1. 10
  2. 12
  3. 14
  4. 6
Answer is b)

15.) Which of the following is the argument for getrt command?

  1. Port number
  2. IP address
  3. Socket descriptor
  4. An address structure
Answer is b)

16.) rti_info is 

  1. A socket address structure
  2. A buffer
  3. The bitmask array
  4. A char array
Answer is c)

17.) Two types of ICMP messages are

  1. Error and Query messages
  2. Request and Reply messages
  3. Data and Control messages
  4. Raw and Reply messages
Answer is a)

18.) Remote applications provided by 4.3 BSD are

  1. rlogin
  2. telnet
  3. rlogin and telnet
  4. TFTP
Answer is b)

19.) TFTP Error Code 3 identifies —————————- error

  1. File not found
  2. Access violation
  3. Disk full
  4. Illegal TFTP operation
Answer is c)

20.) RFC 867 is for 

  1. TIME Protocol
  2. Daytime Protocol
  3. Network Time Protocol
  4. 4.3 BSD timed protocol
Answer is b)

21.The structure or format of data is called ___________
a) Syntax
b) Semantics
c) Struct
d) Formatting

Answer is a)

22.Communication between a computer or a keyboard involves ______________ transmission.
a) Automatic
b) Half-duplex
c) Full-duplex
d) Simplex

Answer is d)

23. URL stands for ________
a) unique reference label
b) uniform reference label
c) uniform resource locator
d) unique resource locator

Answer is c)

24. An alternative to JavaScript on windows platform is _______
a) VBScript
c) JSP
d) PHP

Answer is a)

25. HTTP is ________ protocol.
a) application layer
b) transport layer
c) network layer
d) data link layer

Answer is a)

26. In Active mode FTP, the client initiates both the control and data connections.
a) True
b) False

Answer is b)

27. WiMAX stands for ___________
a) wireless maximum communication
b) worldwide interoperability for microwave access
c) worldwide international standard for microwave access
d) wireless internet maximum communication

Answer is b)

28. Which kind of Ethernet framing is used for TCP/IP and DEC net?
a) Ethernet 802.3
b) Ethernet 802.2
c) Ethernet II
d) Ethernet SNAP

Answer is c)

29. The Novell’s implementation of RIP(Routing Information Protocol) updates routing tables every _________ seconds.
a) 60
b) 90
c) 10
d) 30

Answer is a)

30._____________ allows LAN users to share computer programs and data.
a) Communication server
b) Print server
c) File server
d) Network

Answer is c)

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