06 Jun Suppose that packets arrive from various sources to a statistical
Question
Assignment 9
Due August 24, 2016
Question 1 Suppose that packets arrive from various sources to a statistical multiplexer that
transmits the packets over a 64 kbps PPP link. Suppose that the PPP frames have lengths that
follow an exponential distribution with mean 1000 bytes and that the multiplexer can hold up to
100 packets at a time. Plot the average packet delay as a function of the packet arrival rate.
Question 2 Consider a bidirectional link that uses Go-Back-N with N = 3. Suppose that
frames from station A to station B are one unit long and that they use a time-out value of 2, and
that frames in the opposite directions are 2.5 units long and that they use a time-out value of 4.
Assume propagation and processing times are negligible, that the stations have an unlimited
number of frames ready for transmission, and that all ACKs are piggybacked onto information
frames. Assuming stations, A and B begin with their sequence numbers set to zero, show the
pattern of transmissions and associated state transitions that result if there are no transmission
errors.
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