300-320 Question #648: Real Exam Question with Answer & Explanation

The correct answer is A: Normal area. A remote spoke with a connection to an external network (e.g., an internet link or connection to another routing domain) must be able to redistribute external routes into OSPF. Option A (Normal area) supports Type 5 External LSAs, so external routes can be redistributed without r

Question

Which of the following OSPF area types can be used at a remote spoke site with a connection to an external network? (Choose two.)

Options

ANormal area
BStubby area
CTotally stubby
DNSSA

Explanation

A remote spoke with a connection to an external network (e.g., an internet link or connection to another routing domain) must be able to redistribute external routes into OSPF. Option A (Normal area) supports Type 5 External LSAs, so external routes can be redistributed without restriction. Option D (NSSA - Not-So-Stubby Area) is specifically designed for this scenario: it blocks Type 5 LSAs from other areas (like a stub area) but allows local redistribution of external routes as Type 7 LSAs, which are then converted to Type 5 at the ABR. Option B (Stubby area) blocks all external LSAs, so redistribution of external routes is not permitted. Option C (Totally stubby) blocks both external and inter-area LSAs, making it completely incompatible with external connectivity.

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