300-320 Question #645: Real Exam Question with Answer & Explanation

The correct answer is A: Topology. Three critical OSPF area design considerations are: (A) Topology - physical and logical connectivity determines where area boundaries can be placed, since areas must be contiguous and connect to Area 0. (C) Summarization points - effective area design requires IP addressing that

Question

Which of the following do you need to take into account when designing OSPF areas? (Choose three.)

Options

ATopology
BNumber of users
CSummarization points
DBusiness functions of the targeted network
EThe routers' hardware resources of all routers
FThe routers' hardware resources of ABRs

Explanation

Three critical OSPF area design considerations are: (A) Topology - physical and logical connectivity determines where area boundaries can be placed, since areas must be contiguous and connect to Area 0. (C) Summarization points - effective area design requires IP addressing that supports summarization at area boundaries to reduce LSA flooding and SPF recalculations. (F) Hardware resources of ABRs - ABRs maintain a separate LSDB for each area they belong to and run SPF for each, so their CPU and memory capacity directly limits how many areas and routes they can handle. Number of users (B) is a traffic-planning concern, not an OSPF area design factor. Business functions (D) may influence segmentation but are not an OSPF-specific design input. All routers' hardware (E) is less critical than ABR hardware specifically.

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