Cisco
352-001 · Question #345
352-001 Question #345: Real Exam Question with Answer & Explanation
The correct answer is C: Suboptimal routing is commonly caused by the information that is hidden in the summary route.. Route summarization hides specific subnet details, which can cause routers to forward traffic along suboptimal paths when individual destinations are not visible in the routing table.
Question
When designing IP addressing for route summarization, which consideration is true?
Options
- ASummarization can be applied regardless of the network topology if the IP addressing scheme is
- BIP address space assignments should be based on the divisions of the company.
- CSuboptimal routing is commonly caused by the information that is hidden in the summary route.
- DSummary metrics are constant, regardless of the instabilities of the summary components.
Explanation
Route summarization hides specific subnet details, which can cause routers to forward traffic along suboptimal paths when individual destinations are not visible in the routing table.
Common mistakes.
- A. Summarization requires component subnets to be topologically contiguous and aligned to a bit boundary, so applying it regardless of topology results in route leakage or black holes.
- B. IP address assignments based on organizational divisions do not inherently produce contiguous, summarizable address blocks, and summarization must be driven by network topology rather than company structure.
- D. In protocols like EIGRP and OSPF, summary route metrics are derived from the best metric among component routes and change as component routes fluctuate, so they are not constant.
Concept tested. Route summarization design considerations and suboptimal routing
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