Data Communication & Networking Mcqs-SET 02

Question 16:An example of an analog communication method is

a. laser beam

b. microwave

c. voice grade telephone line

d. all of the above

Ans d

Question 17:Which data communication method is used to transmit the data over a serial communication link?

a. simplex

b. half-duplex

c. full-duplex

d. b and c

e. None of above

Ans c

Question 18:What is the minimum number of wires needed to send data over a serial communication link layer?

a. 1

b. 2

c. 4

d. 6

e. none of above

 Ans b

Question 19:Which of the following types of channels moves data relatively slowly?

a. wide band channel

b. voice band challen

c. narrow band channel

 Ans c

Question 20:Most data communications involving telegraph lines use:

a. simplex lines

b. wideband channel

c. narrowband channel

d. dialed service

 Ans c

Question 21:A communications device that combines transmissions from several I/O devices into one line is a 

a. concentrator

b. modifier

c. multiplexer

d. full-duplex line

 Ans C

Question 22 :How much power (roughly) a light emitting diode can couple into an optical fiber?

a. 100 microwatts

b. 440 microwatts

c. 100 picowatts

d. 10 miliwatts

 Ans A

Question 23:The synchronous modems are more costly than the asynchronous modems because

a. they produce large volume of data

b. they contain clock recovery circuits

c. they transmit the data with stop and start bits

d. they operate with a larger bandwidth

e. none of above

 Ans B

Question 24: In a synchronous modem, the digital-to-analog converter transmits signal to the 

a. equilizer

b. modulator

c. demodulator

d. terminal

e. none of aobve

 Ans A

Question 25:Which of the following communications lines is best suited to interactive processing applications?

a. narrow band channel

b. simplex lines

c. full duplex lines

d. mixed band channels

Ans C

Please Share it! :)