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Exams352-001Questions#116
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352-001 · Question #116

352-001 Question #116: Real Exam Question with Answer & Explanation

The correct answer is B: Summarization prevents the visibility of the metric to the component subnets.. When summarization is applied at multiple locations, the specific metrics of individual component subnets are hidden, causing routers to make routing decisions based solely on the summary metric and potentially choosing suboptimal paths to the server.

Question

In a redesign of a multiple-area network, it is recommended that summarization is to be implemented. For redundancy requirements, summarization is done at multiple locations for each summary. Some customers now complain of higher latency and performance issues for a server hosted in the summarized area. What design issues should be considered when creating the summarization?

Options

  • ASummarization adds CPU overhead on the routers sourcing the summarized advertisement.
  • BSummarization prevents the visibility of the metric to the component subnets.
  • CSummarization creates routing loops.
  • DSummarization causes packet loss when RPF is enabled.

Explanation

When summarization is applied at multiple locations, the specific metrics of individual component subnets are hidden, causing routers to make routing decisions based solely on the summary metric and potentially choosing suboptimal paths to the server.

Common mistakes.

  • A. While summarization adds minor CPU processing overhead on the originating router, this overhead is negligible and does not cause the customer-facing latency and performance issues described in the scenario.
  • C. Summarization itself does not inherently create routing loops; loops can occur with poorly designed discard routes, but are not a general consequence of implementing route summarization.
  • D. RPF (Reverse Path Forwarding) is a multicast mechanism and is unrelated to the unicast routing scenario described; summarization does not cause packet loss through RPF checks in normal unicast designs.

Concept tested. Route summarization hiding component subnet metrics causing suboptimal routing

Reference. https://www.cisco.com/c/en/us/support/docs/ip/ip-routing/13818-99.html

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