300-320 Question #646: Real Exam Question with Answer & Explanation

The correct answer is A: Summarization depends on the IP addressing scheme structure.. 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:

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.

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.

Community Discussion

No community discussion yet for this question.

Full 300-320 Practice