EBK COMPUTER NETWORKING
EBK COMPUTER NETWORKING
7th Edition
ISBN: 8220102955479
Author: Ross
Publisher: PEARSON
Question
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Chapter 5, Problem P20P
Program Plan Intro

Given scenario:

In the given network, ASs “X” and “Z” are connected by AS “Y”. Where, “Z” has a peering agreement with “Y” and “Y’ has a peering agreement with “Z”. The AS “Z” wants to transit all of “Y’s” traffic but it does not want to transit “X’s” traffic.

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Computer Science Suppose KDC X serves one community of users and KDC Y serves a different community of users. KDC X and KDC Y have an established shared symmetric key KXY. Develop the steps of communication needed to enable customer A of KDC X community, to obtain a shared session key with customer B of KDC Y community. KDC X shares a symmetric key with A, KAX, and KDC Y shares a symmetric key with B, KBY. At the end of the steps of communication A and B will have established a session key, KAB.
Consider a scenario in which Host A wants to simultaneously send packets to Hosts B and C. A is connected to B and C via a broadcast channel—a packet sent by A is carried by the channel to both B and C. Suppose that the broadcast channel connecting A, B, and C can independently lose and corrupt packets (and so, for example, a packet sent from A might be correctly received by B, but not by C). Design a stop-and-wait-like error-control protocol for reliably transferring packets from A to B and C, such that A will not get new data from the upper layer until it knows that both B and C have correctly received the current packet. Give FSM descriptions of A and C.
Suppose nodes A and B are on the same 10 Mbps broadcast channel, and the propagation delay between the two nodes is 245 bit-times. Suppose A and B send Ethernet frames at the same time. Suppose the transmission time of the entire frame is 295 bit-times. So, the frames collide, and then A and B choose different values of K in the CSMA/CD algorithm. A node chooses the value of K at random from {0,1,2,...2n−1} where n is the number of collisions experienced on the channel – note n is set to 1 in this case). For Ethernet, the actual amount of time a node waits is K*512 bit times (i.e., K times the amount of time needed to send 512 bits into the Ethernet). Suppose A chooses a K value of 0 and B chooses a K value of 1. Assuming no other nodes are active, can the retransmissions from A and B collide? Justify your answer by showing all the intermediate steps of your calculations.
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