hw3-sols

hw3-sols - CS 118 Spring 2008 : Homework 3 Problem 1...

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CS 118 Spring 2008 : Homework 3 Problem 1 Problem 1 In the rdt3.0 protocol, the ACK packets that flow from the receiver back to the sender don’t have sequence numbers, even though they do have the ACK field that contains the sequence number of the packet that they are acknowledging. Why don’t these ACK packets need sequence numbers? - Sequence #s are for data - ACKs refer to data so they don’t have to be uniquely ID’ed - ACK packets can be repeated, and seq #s just detect duplicates Problem 2 True or false (give justifications for your answers): a In the SR protocol, it is possible for the sender to receive an ACK for a packet that falls outside of its current window. b In the GBN protocol, it is possible for the sender to receive an ACK for a packet that falls outside of its current window. c The alternating-bit protocol is the same as the SR protocol with a sender and receiver window size of 1. d The alternating bit protocol is the same as the GBN protocol with a sender and receiver window size of 1.
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hw3-sols - CS 118 Spring 2008 : Homework 3 Problem 1...

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