Data Communication and Networks MCQs

This is a set of 20 questions or MCQS of data communication and networks. For different topics, MCQs click here.

What is Data Communication and Networks(DCN)?

Data communications refer to the transmission of this digital data between two or more computers and a computer network or data network is a telecommunications network that allows computers to exchange data. 

01). An Unauthorized access is network ____ issue
a. Performance
b. Reliability
c. Security
d. Accountability

02). The rules that govern data communication is called ____.
a. Syntax
b. Protocol
c. Standards
d. Semantics

03). Topology that is multi-point is_____.
a. Star
b. Mesh
c. Ring
d. Bus

04). As the frequency increases the period
a. Increases
b. Remains unchanged
c. Decreases
d. Changes inconsistently

05). Error Control is a function of
a. Physical Layer
b. Network Layer
c. Datalink Layer
d. None of the above

06). HDLC is
a. High Density Layer Control
b. High Definition Layer Control
c. High-level Data Link Control
d. None of the above

07). Checksum is used to
a. Detect errors in the data
b. Recover the data from errors
c. Both a and b.
d. None of the above

08). Go-Back-N Protocol ensures
a. Retransmission of all frames
b. Retransmission of only corrupted frames
c. Retransmission of corrupted frames and subsequent frames.
d. All the above

09). A Local Area Network(LAN ) is confined to
a. Large area
b. Small area
c. Both a and b.
d. None of the above

10). Baseband LAN is a
a. Single channel, analog LAN
b. Multichannel, analog LAN
c. Single channel, digital LAN
d. Multichannel, digital LAN

11.) IEEE 802.2 standard works on
a. Connectionless mode
b. Connection-oriented mode
c. Both a and b .
d. None of the above.

12).Size of source address field iu an Ethernet frame is
a. 2 bytes
b. 6 bytes
c. 4 bytes
d. 3 bytes

13).In which type of switching all packets of a message follow same

a. Datagram packet switching
b. Virtual circuit switching
c. Message switching
d. None of the above.

14). __________ is a device that connects n inputs to m outputs.
a. Modem
b. Cross point
c. Cross bar
d. RAM

15). How many OSI layers are covered in X.25 standard?
a. Two
b. Three
c. Six
d. Seven

16). _________is a unique identifier which indicates a particular
Virtual Circuit on a network.
a. Virtual Channel number
b. Virtual Path identifier
c. Virtual Channel identifier
d. None of the above

17). An IP address consists of ______bits.
a. 4
b. 8
c. 32
d. Any of the above

18). Identify the class of IP address
a. Class A
b. Class B
c. Class C
d. Class D

19). An ARP reply is to __
a. Unicast; one host
b. Unicast; all hosts
c. Multicast; One host
d. Broadcast; all host

20). Which of the following function does UDP perform?
a. Process to process communication
b. Host to host communication
c. End to end reliable data delivery
d. All the above

Answer of Data Communication and Networks

Answer of Data Communication and Networks
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