What are the only two roles that permit an OSPF router to be configured for summarization? (Choose two.)

What are the only two roles that permit an OSPF router to be configured for summarization? (Choose two.)

• designated router
• backbone router
• internal router
• autonomous system boundary router
• area border router

Explanation: Because the LSDBs on every router within an area must be the same, OSPF summarization can only be done between areas, or between autonomous systems. For this reason, only an ABR or an ASBR can be configured to perform summarization. An ABR can summarize interarea routes between areas, and an ASBR can summarize external routes as they enter the OSPF domain.

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