300-320 · Question #645
Which of the following do you need to take into account when designing OSPF areas? (Choose three.)
The correct answer is A. Topology C. Summarization points F. The routers' hardware resources of ABRs. 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…
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
How the community answered
(46 responses)- A76% (35)
- B2% (1)
- D7% (3)
- E15% (7)
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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