EBK COMPUTER NETWORKING
EBK COMPUTER NETWORKING
7th Edition
ISBN: 8220102955479
Author: Ross
Publisher: PEARSON
Textbook Question
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Chapter 1, Problem P11P

In the above problem, suppose R1 = R2 = R3 = R and dproc = 0. Further suppose the packet switch does not store-and-forward packets but instead immediately transmits each bit it receives before waiting for the entire packet to arrive. What is the end-to-end delay?

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Consider the Go-Back-N (GBN) and Selective Repeat (SR) protocols with a sender window size of 4 and a sequence number range of 1024. For each of these protocols, describe what happens for the following cases:a) The first packet in the sender window size is lost before reaching the destination.b) All transmitted packets reached the destination except the third one.c) Only the first and last packets in the sender window size reached the destination.d) Only the ACKs of the first and last packets, in the sender window size, reached the destination.
Consider a datagram network in which a packet travels through two switches S1 and S2 from source to destination. Packet experiences wait at each switch before it is forwarded. Transmission time, propagation time and wait time at each node is 3 ms, 1.5 ms, and 0.25 ms respectively. Find the total delay.
A packet switch receives a packet and determines the outbound link to which the packet should be forwarded. When the packet arrives, one other packet is halfway done being transmitted on this outbound link and four other packets are waiting to be transmitted. Packets are transmitted in order of arrival. Suppose all packets are 1,500 bytes and the link rate is 2 Mbps. What is the queuing delay for the packet? More generally, what is the queuing delay when all packets have length L, the transmission rate is R, x bits of the currently-being-transmitted packet have been transmitted, and n packets are already in the queue?

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EBK COMPUTER NETWORKING

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