Computer Networks

1. Consider the leaky bucket policer that polices the average rate and burst size of a packet flow. We now want to police the peak rate, p, as well. Show how the output of this leaky bucket policer can be fed into a second leaky bucket policer so that the two leaky buckets in series police the average rate, peak rate, and burst size. Be sure to give the bucket size and token generation rate for the second policer.

a) Can a host continue transmitting pure ACKs even after it has sent a FIN flag field in a TCP transmission?

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b) What would happen if pure ACKs were also acknowledged?

c) What is the use of CRLF in HTTP?

How do you think TCP would handle the problem if an acknowledgment were lost, so that the sender retransmitted the unacknowledged TCP segment, therefore causing the receiving transport process to receive the same segment twice?

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