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350-601 · Question #591

350-601 Question #591: Real Exam Question with Answer & Explanation

The correct answer is A: N9K2(config-router)# area 1 nssa. An NSSA (Not-So-Stubby Area) allows external routes to be redistributed into the OSPF domain while still restricting the propagation of type 5 LSAs (External LSAs). In an NSSA, external routes are advertised as type 7 LSAs, which are translated into type 5 LSAs by the NSSA's ABR

Network

Question

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?

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

Explanation

An NSSA (Not-So-Stubby Area) allows external routes to be redistributed into the OSPF domain while still restricting the propagation of type 5 LSAs (External LSAs). In an NSSA, external routes are advertised as type 7 LSAs, which are translated into type 5 LSAs by the NSSA's ABR (Area In this scenario, configuring area 1 as NSSA on both N9K2 and N9K3 ensures that the route 10.1.1.15/32 is advertised as a type 7 LSA to N9K3.

Topics

#OSPF#LSA Type 7#NSSA#Routing Protocols

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