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Exam 300-510 topic 1 question 218 discussion

Actual exam question from Cisco's 300-510
Question #: 218
Topic #: 1
[All 300-510 Questions]



Refer to the exhibit. IS-IS is the routing protocol on the network. After the team noticed excessive CPU usage on all routers, particularly routers R2 and R6, they configured route summarization on all routers. However, a network engineer noticed that summary routes and more specific routes are present in the routing table on R1. Which action must the team take so that R1 receives only the summary routes?

  • A. Configure R3 and R5 to perform summarization for Level 1 and Level 2 routers.
  • B. Configure R2 and R4 to perform summarization for Level 1 routers.
  • C. Configure R6 only to perform summarization for all routers.
  • D. Configure R3 to perform summarization for Level 1 routers, and configure R6 to perform summarization for Level 2 routers.
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Suggested Answer: B 🗳️
by DUsoo at April 11, 2024, 12:18 p.m.

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snowbow
11 months, 2 weeks ago
Selected Answer: A
After thinking on it, this must be A, they specifically call out routers 2 and 6 as having issues, by summarizing level 1 routes from area 2 to area 1 we can fix R2. If we also summarize on R3/R5 towards R6 for level 2 routes we can fix it as well.
upvoted 2 times
Seele
9 months, 4 weeks ago
I think so too, but the question that needs to be answered is "action must the team take so that R1 receives only the summary routes", thereby ignoring the fact that R2 and R6 have high utilization.
upvoted 1 times
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DUsoo
1 year ago
You can only configure summarization between areas or on a router that is doing redistribution. So if there is not any redistribution on R2/R4 you can not do summarization there.
upvoted 1 times
snowbow
11 months, 2 weeks ago
R2 and R4 are ABRs between Area 1 and Area 2, so not sure why they wouldn't be able to summarize. Either way I'm not sure of a good answer here
upvoted 1 times
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