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Authors:
James F. Kurose, Keith W. Ross
Chapter:
The Network Layer
Exercise:
Review
Question:24 | ISBN:9780132856201 | Edition: 6

Question

Consider Figure 4.37. Starting with the original table in D, suppose that D receives from A the following advertisement:



Will the table in D change? If so how?

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Answer

Consider A sends an advertisement to D, and D receives the advertisement. The table given in Figure 4.37 is at D. After receiving the advertisement from A, the table at D has no impact.

The reasons for no impact are listed below:

  • Observing the table at A, D can reach Z in (10+1) 11 hops using A.
  • But, D can reach Z using path through B in 7 hops. So, D has a path with shorter distance to Z when compared to path through A. So, there is no need to modify the entry of Z in table of D.
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