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352-001 · Question #439
352-001 Question #439: Real Exam Question with Answer & Explanation
The correct answer is A: Reduce the number of routes within an area.. Dividing a large OSPF network into multiple areas reduces both the size of the link-state database within each area and the frequency of SPF recalculations, improving scalability and stability.
Question
Which two options are reasons for designing a large OSPF network with multiple areas connected to the backbone? (Choose 2)
Options
- AReduce the number of routes within an area.
- BRoute tagging capability.
- CEnhance failure detection.
- DSimplify logical topology.
- EReduces SPF algorithm runs.
Explanation
Dividing a large OSPF network into multiple areas reduces both the size of the link-state database within each area and the frequency of SPF recalculations, improving scalability and stability.
Common mistakes.
- B. Route tagging is used during redistribution to mark external routes, and it is not a reason to design multiple OSPF areas.
- C. Multi-area OSPF does not inherently enhance failure detection - Hello/Dead timers and BFD govern detection speed regardless of area design.
- D. Adding multiple areas and an ABR hierarchy increases logical complexity rather than simplifying it.
Concept tested. OSPF multi-area design benefits and scalability
Reference. https://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/7039-1.html
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