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Given the diagram below, what path will traffic follow from router R6 to router R3, and from router R3 to router R6, if IS-IS is the routing protocol? The numbers beside the links are the metrics for that link.
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4A0-101 Exam - Question 9
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Correct Answer: AC
In IS-IS routing protocol, routers use metrics to determine the best path to reach the destination. For traffic from R6 to R3, the route R6-R5-R2-R3 is chosen because the total metric cost is 10 (R6-R5) + 10 (R5-R2) + 15 (R2-R3) = 35. For traffic from R3 to R6, the route R3-R2-R5-R6 is also chosen as R3 will use the same route in reverse to reach R6 due to the symmetrical nature of metric-based path selection, making the total metric cost 15 (R3-R2) + 10 (R2-R5) + 10 (R5-R6) = 35. Both directions follow the same path because they have the same cumulative metric cost.
Discussion
2 commentsSajjadKarimOption: D
Oct 24, 2020I think Answer is D, As link cost between R2 and R3 is 15
SajjadKarim
Oct 29, 2020Sorry answer C is correct
ocenicOption: C
Nov 2, 2020R3 has default route from R4 that has better metric than default route from R2. R4 has better metric over R7 than over R2 to R5. So C is correct.