P7. Consider the network fragment shown below. x has only two attached neighbors, w and y. w has a minimum-cost path to destination u (not shown) of 5, and y has a minimum-cost path to u of 6. The complete paths from w and y to u (and between w and y) are not shown. All link costs in the network have strictly positive integer values. a) Give x’s distance vector for destinations w, y, and u.   b) Give a link-cost change for either c(x,w) or c(x,y) such that x will inform its neighbors of a new  minimum‐cost path to u as a result of executing the distance‐vector algorithm.  c) Give a link‐cost change for either c(x,w) or c(x,y) such that x will not inform its neighbors of a  new minimum‐cost path to u as a result of executing the distance‐vector algorithm.

Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
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P7. Consider the network fragment shown below. x has only two attached neighbors, w and y. w has a minimum-cost path to destination u (not shown) of 5, and y has a minimum-cost path to u of 6. The complete paths from w and y to u (and between w and y) are not shown. All link costs in the network have strictly positive integer values.

a) Give x’s distance vector for destinations w, y, and u.  

b) Give a link-cost change for either c(x,w) or c(x,y) such that x will inform its neighbors of a new  minimum‐cost path to u as a result of executing the distance‐vector algorithm

c) Give a link‐cost change for either c(x,w) or c(x,y) such that x will not inform its neighbors of a  new minimum‐cost path to u as a result of executing the distance‐vector algorithm.  

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