300-320 · Question #646
Which statements about OSPF optimal design are true? (Choose two.)
The correct answer is A. Summarization depends on the IP addressing scheme structure. C. Multiarea OSPF design offers more scalable design. Option A is true: route summarization in OSPF requires a hierarchically structured IP addressing scheme - you cannot summarize discontiguous or randomly assigned addresses at area boundaries. This makes address planning a prerequisite for effective OSPF design. Option C is…
Question
Which statements about OSPF optimal design are true? (Choose two.)
Options
- ASummarization depends on the IP addressing scheme structure.
- BIn hub-and-spoke topology, the hub must be the ABR.
- CMultiarea OSPF design offers more scalable design.
- DMultiarea OSPF design adds increased operational complexity.
How the community answered
(28 responses)- A71% (20)
- B11% (3)
- D18% (5)
Explanation
Option A is true: route summarization in OSPF requires a hierarchically structured IP addressing scheme - you cannot summarize discontiguous or randomly assigned addresses at area boundaries. This makes address planning a prerequisite for effective OSPF design. Option C is true: multiarea OSPF improves scalability by containing LSA flooding within areas, reducing LSDB size per router, and limiting SPF recalculations to only the affected area. Option B is false - in hub-and-spoke topologies, the hub does not have to be the ABR; the ABR placement depends on the addressing and topology design. Option D (multiarea adds operational complexity) is a factual statement but is a trade-off, not an optimal design principle - the question asks about optimal design truths.
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