The ABR of the OSPF complete stub area does not flood the third, fourth and fifth type LSAs to the area. Therefore, the ABR of the complete stub area needs to manually configure a default route to…

Question

Options

• ATRUE
• BFALSE

• A
  31% (9)
• B
  69% (20)

Explanation

Option B is correct because the statement contains a critical inaccuracy: the ABR of a totally stubby (complete stub) area automatically generates and floods a default route (a Type 3 LSA for 0.0.0.0/0) into the area - no manual configuration is required. This automatic default route injection is precisely what makes totally stubby areas function, allowing internal routers to forward unknown-destination traffic to the ABR without needing full Type 3/4/5 LSA detail. Option A (TRUE) is wrong because it incorrectly implies the default route must be manually configured, confusing totally stubby area behavior with NSSA areas, where a default route sometimes does require explicit configuration. Memory tip: Think of the ABR as a "caring gatekeeper" - when it blocks the detailed LSAs (Types 3, 4, 5), it automatically hands stubs a single default exit sign (0.0.0.0/0) so routers aren't left without direction; auto-block = auto-default.

No community discussion yet for this question.