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WAN MCQs - Wide Area Networks Objective Type Questions & Answers

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(1) Which device in communication satellite listens to some portion of a spectrum, amplifies the incoming signal, and then rebroadcasts it at another frequency ?
[A] Transponder
[B] Repeater
[C] Gateway
[D] None of these

Comment

Answer: Option [A]
(2) Which device is used at a receiving end of an optical fiber ?
[A] Led
[B] Interferometer
[C] Photodiode
[D] None of these

Comment

Answer: Option [C]
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(3) In optical fiber, light does not propagate best in ‘window’ centered at
[A] 850 nm
[B] 1300 nm
[C] 1500 nm
[D] None of these

Comment

Answer: Option [C]
(4) Which of the following protocols cannot be used on satellite-based wide area networks ?
[A] CDMA
[B] Polling
[C] FDM
[D] None of these

Comment

Answer: Option [D]

Satellite based wide area networks use five classes of protocols polling, ALOHA, FDM, TDM, and CDMA.

(5) How many 64-kbps digital voice channels can be encoded by a 50-Mbps transponder in satellite communication ?
[A] 320
[B] 640
[C] 800
[D] None of these

Comment

Answer: Option [C]

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