Refer to the exhibit. The network 10.1.1.15/32 is advertised to N9K1. N9K2 and N9K3 OSPF neighbors in area 1. Which configuration advertises network 10.1.1.15/32 as LSA type 7 to N9K3?

Question

Exhibit

Options

• AN9K2(config-router)# area 1 nssa
• BN9K2 (config-router)# area 1 stub no-summary
• CN9K1 (config-router)# area 0 stub no-summary
• DN9K1(config-router)# area 0 nssa

• A
  71% (15)
• B
  14% (3)
• C
  10% (2)
• D
  5% (1)

Explanation

LSA Type 7 (NSSA External LSA) is generated only within a Not-So-Stubby Area (NSSA). It is used to carry redistributed external routes inside an NSSA and is converted to a Type 5 LSA by the ABR at the area boundary. In the topology, N9K3 is in area 1, and N9K2 is the ABR between area 0 and area 1. To make N9K3 receive the route 10.1.1.15/32 as a Type 7 LSA, area 1 must be designated as NSSA on N9K2 with area 1 nssa. This causes N9K2 to translate the Type 5 LSA from the backbone into a Type 7 LSA and flood it into area 1. Option B (stub no-summary) creates a totally stubby area, which blocks external routes entirely. Options C and D incorrectly apply NSSA or stub configuration to area 0, which cannot be a stub or NSSA.

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