Submit answer to the Problem 18 of Chap 6.
Suppose nodes A and B are on the same 10 Mbps broadcast channel,
and the
propagation delay between the two nodes is 325 bit times. Suppose
CSMA/CD
and Ethernet packets are used for this broadcast channel (see Page
476 for
Ethernet frame structure, minimum size of frame is 512+64 bits).
Suppose node A
begins transmitting a frame and, before it finishes, node B begins
transmitting a
frame. Can A finish transmitting before it detects that B has
transmitted? Why or
why not? If the answer is yes, then A incorrectly believes that its
frame was
successfully transmitted without a collision. Hint: Suppose at time
t=0 bits, A
begins transmitting a frame. In the worst case, A transmits a
minimum-sized
frame of 512+64 bit times. So A would finish transmitting the frame
at t= 512+64
bit times. Thus, the answer is no, if B’s signal reaches A before
bit time t=512+64
bits. In the worst case when does B’s signal reach A?
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