H12-821_V1.0 · Question #777
Type 7 LSA does not exist in the Stub area and Totally Stub area.
The correct answer is B. FALSE. B is correct because Type 7 LSAs are specifically designed for NSSA (Not-So-Stubby Areas) - they absolutely do exist in OSPF, just not in regular Stub or Totally Stub areas. The statement is false because it misleadingly implies Type 7 LSAs are universally absent, when in…
Question
Options
- ATRUE
- BFALSE
How the community answered
(34 responses)- A15% (5)
- B85% (29)
Explanation
B is correct because Type 7 LSAs are specifically designed for NSSA (Not-So-Stubby Areas) - they absolutely do exist in OSPF, just not in regular Stub or Totally Stub areas. The statement is false because it misleadingly implies Type 7 LSAs are universally absent, when in reality they are the defining feature of NSSA areas, allowing external routes to be advertised while blocking standard Type 5 LSAs.
Why A is wrong: Marking it TRUE would mean accepting that Type 7 LSAs play no role anywhere in OSPF - but NSSAs rely entirely on Type 7 LSAs to carry external routing information. An ABR then translates those Type 7s into Type 5 LSAs for the rest of the OSPF domain.
Area comparison to lock in the logic:
| Area Type | Type 5 LSAs | Type 7 LSAs |
|---|---|---|
| Backbone / Normal | Allowed | Not used |
| Stub | Blocked | Not used |
| Totally Stub | Blocked | Not used |
| NSSA | Blocked | Present |
| Totally NSSA | Blocked | Present |
Memory tip: Associate 7 with N - "Type 7 lives in NSSA." Any area with the "N" (Not-So-Stubby) designation gets Type 7 LSAs; plain Stub areas - with or without the "Totally" modifier - never do.
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