300-320 · Question #648
Which of the following OSPF area types can be used at a remote spoke site with a connection to an external network? (Choose two.)
The correct answer is A. Normal area D. NSSA. 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…
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
How the community answered
(27 responses)- A78% (21)
- B15% (4)
- C7% (2)
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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