Multiple Choice Questions for Data Communication and Networking
Selective Data Communication and Networking Questions and Answers:
Q.91 B, Zero Code Suppression is a technique that …
(A) allows data to flow on a digital line
(B) ensures that each byte has at least one-mark bit
(C) it is the latest clear channel encoding technique developed by Bell Laboratories
(D) provides a clear channel transmission capability, allowing 64 kbps data transmission on a voice4 channel
Ans . D
Q.92 International bipolar violations……
(A) represent coding errors caused by line impairments
(B) are used to convey information or maintain a minimum number of ones on a digital line
(C) result in successive marks having opposite polarities
(D) occur only in the laboratory
Ans . B
Q.93 Demultiplexing by a time division multiplexer occurs based on the…….
(A) the position of data within a frame
(B) the position of a frame within a group of frames
(C) the activity of a connected device
(D) the priority assigned to a connected device
Ans . A
Q.94 They key to the operation of ADPCM is….
(A) fast sampling
(B) high amplitude
(C) adaptive predictor
(D) digitization
Ans . C
Q.95 The maximum modem operating rate that can be transported by ADPCM is……
(A) 300 bps
(B) 1200 bps
(C) 4800 bps
(D) 9600 bps
Ans . C
Q.96 Higher the rate an analog signal is sampled
(A) smaller the difference between sampled amplitudes
(B) larger the difference between sampled amplitudes
(C) greater the noise level
(D) more bits required to represent the sample
Ans . A
Q.97 Common CVSD digitization rates are….
(A) 8 and 64 kbps
(B) 65 and 128 kbps
(C) 4 and 8 kbps
(D) 32 and 16 kbps
Ans . D
Q.98 A voice/data multiplexer will not flow control….
(A) voice
(B) data
(C) time slots
(D) odd channels
Ans . A
Q.99 The core for an optical fiber has….
(A) lower index of refraction than air
(B) lower index of refraction than the cladding
(C) a higher index of refraction than the cladding
(D) none of these
Ans . C
Q.100 Over a period of 30 years, a kilometer of fiber optic cable is likely to be broken.
(A) not at all
(B) once
(C) 10 times
(D) 2 or 3 times
Ans . D
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Rajesh Bhatia
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