Data Communication and Networking MCQ Questions and Answers - 3

Question: 11

Modulation is the process of

(A) Echoing every character that is received

(B) Sending a file from one computer to another computer

(C) Converting digital signals to analog signals

(D) Converting analog signals to digital signals

Question: 12

Many low-shaped channels are interwoven into one high-speed transmission by

(A) Frequency-division multiplexer

(B) Time-division multiplexer

(C) Both (a) and (b)

(D) None of these

Question: 13

Which of the following is the difference between a multiplexer and a statistical multiplexer?

(A) Multiplexer use X.25 protocol, while statistical multiplexers use the Alpha protocol

(B) Statistical multiplexers need buffers while multiplexers do not need buffers

(C) Multiplexers often waste the output link capacity while statistical multiplexers oppose its use

(D) Multiplexers use Time Division multiplexing (TDM) while statistical multiplexers uses Frequency division multiplexing (FDM)

Question: 14

The synchronous modems are more costly than the asynchronous modems because

(A) They operate with a larger bandwidth

(B) They produce large volume of data

(C) They contain clock recovery circuits

(D) They transmit the data with stop and start bits

Question: 15

To connect a computer with a device in the same room, you might be likely to use

(A) A ground station

(B) A dedicated line

(C) A coaxial cable

(D) All of the above