Digital Communications Questions and Answers – Protocols

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This set of Digital Communications Multiple Choice Questions & Answers (MCQs) focuses on “Protocols”.

1. Protocol is a set of
a) Formats
b) Procedures
c) Both of the mentioned
d) None of the mentioned
View Answer

Answer: c
Explanation: Protocol is a set of procedures and formats that entities use to communicate information.

2. The time required to transmit frame depends on
a) Frame size
b) Channel capacity
c) Both of the mentioned
d) None of the mentioned
View Answer

Answer: c
Explanation: The time to transmit frame is given by the ratio of frame size and channel capacity.

3. Window given the number of
a) Bytes
b) Frames
c) Both of the mentioned
d) None of the mentioned
View Answer

Answer: c
Explanation: Window gives the number of frames or bytes that can be in transit unacknowledged.

4. Routing is
a) Static
b) Dynamic
c) Both of the mentioned
d) None of the mentioned
View Answer

Answer: c
Explanation: Routing can be static and dynamic.

5. Routing is performed only centrally.
a) True
b) False
View Answer

Answer: a
Explanation: Routing is performed centrally and also in fully distributed way.

6. Which is connection oriented and which is connection-less?
a) Datagrams, virtual circuits
b) Virtual circuits, datagrams
View Answer

Answer: b
Explanation: Datagram is connection-less and virtual circuits are connection oriented.

7. Which uses UDP?
a) Echo
b) Time
c) Domain name server
d) All of the mentioned
View Answer

Answer: d
Explanation: The protocols using UDP are echo, time, domain name server, network file system etc.

8. Which uses TCP?
a) Simple mail transfer protocol
b) Simple network management protocol
c) Both of the mentioned
d) None of the mentioned
View Answer

Answer: a
Explanation: Some of the protocols using TCP are http, telnet, file transfer protocol, simple mail transfer protocol etc.

9. Which tells about low level transmission and framing?
a) V series
b) X series
c) G series
d) Q series
View Answer

Answer: c
Explanation: G series tells about level transmission, modulation and framing.

10. Which tells about signalling?
a) V series
b) X series
c) G series
d) Q series
View Answer

Answer: d
Explanation: Q series tells about signalling.

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