Subject: Problem 3(c) of PS4
From: Rajmohan Rajaraman (rraj@ccs.neu.edu)
Date: Thu Dec 06 2001 - 21:20:54 EST
It was pointed to me that the solution to Problem 3 part (c) of PS4 --
the CSMA-CD part, as given in the sample solution, is not correct.
In particular, at time 3, when a packet arrives at C, the channel, as
sensed by C, is still busy because A does not stop transmitting until
time 3. So C must not attempt to transmit at time 3, and must instead
reschedule. The sample solution handed out in class showed that C
senses an idle channel and transmits successfully, and this is
incorrect.
The solution with the above correction is available from the course
homepage. Best,
Rajmohan.
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