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.
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.