26. Given the following statements:
(A) Frequency Division Multiplexing is a technique that can be applied when the bandwidth of a link is greater than combined bandwidth of signals to be transmitted.
(B) Wavelength Division Multiplexing (WDM) is an analog multiplexing Technique to combine optical signals.
(C) WDM is a Digital Multiplexing Technique.
(D) TDM is a Digital Multiplexing Technique.
Which of the following is correct?
(A), (B), (C) and (D) are true
(A), (B), (C) and (D) are false.
(A), (B) and (D) are false; (C) is true.
(A), (B) and (D) are True; (C) is false.
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27. A pure ALOHA Network transmits 200 bit frames using a shared channel with 200 Kbps bandwidth. If the system (all stations put together) produces 500 frames per second, then the throughput of the system is ______.
28. Match the following:
29. Assume that we need to download text documents at the rate of 100 pages per minute. A page is an average of 24 lines with 80 characters in each line and each character requires 8 bits. Then the required bit rate of the channel is _____.
30. Encrypt the plain text Message “EXTRANET” using Transposition cipher technique with the following key : Using ‘Z’ as bogus character.
UGC NET PAPER 1
UGC NET Management
UGC NET COMPUTER SCIENCE
UGC NET COMMERCE
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CFA Level 1
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