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Refer to the exhibit. OSPF is an interior routing protocol on the network. R2 is in the backbone area, and R4 is in a totally NSSA area. R5 announces only the 0.0.0.0/0 route to R4 via BGP. R4 is configured with redistribute bgp 736 metric-type 2. After the most recent maintenance window, R2 no longer has the default route via R4. Which action must the network engineer take to correct the reachability problem?
Correct Answer: D
R4 is part of a totally NSSA area (area 2) and receives a default route 0.0.0.0/0 via BGP. OSPF NSSA uses Type 7 LSAs for routes redistributed into the NSSA, which are then translated into Type 5 LSAs at the ABR (R2 in this case). R2 no longer has the default route because the Type 7 LSA is not being translated into a Type 5 LSA. By default, an ABR translates Type 7 LSAs into Type 5 LSAs, but certain conditions or configurations (e.g., suppress-fa) can prevent this translation. area 2 nssa translate type7 no- suppress-fa ensures that R2 translates the Type 7 LSA (from R4) into a Type 5 LSA. This allows the default route 0.0.0.0/0 to propagate from R4 to R2 and the rest of the OSPF network.