JNCIP-SP: Juniper Networks Certified Professional – Service Provider (2023) — Question 73

By default, which statement is correct about OSPF summary LSAs?

Answer options

• A. The metric associated with a summary route will be equal to the lowest metric associated with an individual contributing route.
• B. The area-range command must be installed on all routers.
• C. Type 3 LSAs are advertised for routes in Type 1 LSAs.
• D. All Type 2 and Type 7 LSAs will be summarized into a single Type 5 LSA.

Correct answer: C

Explanation

The correct answer is C because Type 3 LSAs (Summary LSAs) are used to summarize routes from Type 1 LSAs (Router LSAs). Option A is incorrect as the metric for a summary route is based on the configured metric, not necessarily the lowest. Option B is wrong because the area-range command is not a requirement on all routers, and Option D is incorrect since Type 2 and Type 7 LSAs are not summarized into Type 5 LSAs.