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Authors:
James F. Kurose, Keith W. Ross
Chapter:
The Network Layer
Exercise:
Problems
Question:40 | ISBN:9780132856201 | Edition: 6

Question

In Figure 4.42, consider the path information that reaches stub networks W, X, and Y. Based on the information available at W and X, what are their respective views of the network topology? Justify your answer. The topology view at Y is shown below.


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Answer

Consider data:

The path information that reaches stub networks W, X, and Y. Based on the information available at W and X.

Given diagram is the topology view at sub network Y:

The respective sub network W’s views of the network topology:

Here the sub network  W contains a single path to AS A, then next AS A forwards packets to intermediate networks B and C. Simply, w receives the links AC, AB respectively.

The respective stb network X’s views of the network topology:

No connection between A and C. So, the Autonomous system X has no knowledge of the link AC. Therefore, the destination path has no data about the paths AS A and AS C.

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