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A pure ALOHA network transmits 200-bit frames on a shared channel of 200 kbps. What is the requirement to make this frame collision-free?(a) 2msec(b) 4msec(c) 2sec(d) 4secI have been asked this question in an international level competition.My query is from Layers topic in section Cryptography Overview, TCP/IP and Communication Networks of Cryptograph & Network Security

Answer»

The CORRECT choice is (a) 2msec

To explain: AVERAGE frame TRANSMISSION time

Tfr = 200 bits/200 kbps or 1 MS

Vulnerable time = 2x Tfr = 2 × 1 ms = 2 ms.



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