Use the default route-advertise command in OSPF to advertise the default route to the common OSPF area. When there is no default route in the area, use ___ to control the advertisement.

Question

Options

• AOrigin
• B
• C
• D

• A
  81% (39)
• B
  2% (1)
• C
  4% (2)
• D
  13% (6)

Explanation

Option A (always) is correct because the default-route-advertise always keyword forces an OSPF router - typically an ASBR or ABR - to generate and advertise a default route LSA into the OSPF area even when no default route currently exists in the local routing table; without this keyword, the advertisement only occurs if a matching default route is already present. The always parameter gives administrators explicit control over whether the default route is originated unconditionally, which is critical in designs where the default route may be temporarily absent but downstream routers still need a path of last resort advertised to them. Options B, C, and D were not provided in this question, so no valid distractors are available to evaluate. Memory tip: think of always as overriding the normal "only advertise what you have" rule - if you want OSPF to advertise the default route no matter what, you must say always explicitly.

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