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This option proposes: An OSPF ASBR originates type 5 external LSAs in eligible areas; E1 metrics account for internal cost toward the ASBR, whereas E2 selection prioritizes external cost except for applicable tie-breakers. It addresses the different topic OSPF external LSAs and E1 versus E2 cost, not the directly tested NSSA type seven translation and default routing failure in the stated incident (An acquisition branch runs as an NSSA and redistributes a vendor route, but headquarters never learns it because the translator ABR has no usable advertisement.).

This option proposes: Passive OSPF interfaces can stop unwanted neighbor discovery while their connected networks may still be advertised through the OSPF process; authentication protects routing exchanges and requires compatible peer settings. It addresses the different topic OSPF interface security and passive network advertisement, not the directly tested NSSA type seven translation and default routing failure in the stated incident (An acquisition branch runs as an NSSA and redistributes a vendor route, but headquarters never learns it because the translator ABR has no usable advertisement.).

This option proposes: IS-IS LSP control flags and route-leaking policy determine appropriate reachability; an overload indication can steer other routers away from using an overloaded node as transit while preserving selected directly attached reachability. It addresses the different topic IS-IS routing leakage and overload bit, not the directly tested NSSA type seven translation and default routing failure in the stated incident (An acquisition branch runs as an NSSA and redistributes a vendor route, but headquarters never learns it because the translator ABR has no usable advertisement.).

This option proposes: Inspect the originating ASBR, type 5 LSA, external metric type and metric, cost toward the ASBR and actual selected external next hop. It addresses the different topic OSPF external LSAs and E1 versus E2 cost, not the directly tested NSSA type seven translation and default routing failure in the stated incident (An acquisition branch runs as an NSSA and redistributes a vendor route, but headquarters never learns it because the translator ABR has no usable advertisement.).

This option proposes: Inspect bridge IDs, selected root bridge, root-path costs, each port role and current alternate/discarding state. It addresses the different topic RSTP port roles and rapid convergence, not the directly tested NSSA type seven translation and default routing failure in the stated incident (An acquisition branch runs as an NSSA and redistributes a vendor route, but headquarters never learns it because the translator ABR has no usable advertisement.).

This option proposes: Compare each candidate path's per-interface costs, SPF route metrics, topology database and resulting next-hop entries. It addresses the different topic OSPF SPF calculation and interface cost changes, not the directly tested NSSA type seven translation and default routing failure in the stated incident (An acquisition branch runs as an NSSA and redistributes a vendor route, but headquarters never learns it because the translator ABR has no usable advertisement.).

That option concerns VRRP master election priority and tie breaks. That follows from the targeted action: Verify NSSA area behavior and type 7-to-type 5 translation when redistributing an external prefix inside a non-backbone area.

That option concerns OSPF router network and summary LSA scope. That follows from the targeted action: Verify NSSA area behavior and type 7-to-type 5 translation when redistributing an external prefix inside a non-backbone area.

That option concerns OSPF broadcast DR and BDR election. That follows from the targeted action: Verify NSSA area behavior and type 7-to-type 5 translation when redistributing an external prefix inside a non-backbone area.

This option proposes: Check IS-IS level-1-to-level-2 route leaking and the overload bit before selecting a device as a transit path. It addresses the different topic IS-IS routing leakage and overload bit, not the directly tested NSSA type seven translation and default routing failure in the stated incident (An acquisition branch runs as an NSSA and redistributes a vendor route, but headquarters never learns it because the translator ABR has no usable advertisement.).

This option proposes: Inspect all routers' area flags, ABR default LSA advertisement, permitted LSA types and whether an ASBR is incorrectly placed in the area. It addresses the different topic Stub and totally stub area restrictions, not the directly tested NSSA type seven translation and default routing failure in the stated incident (An acquisition branch runs as an NSSA and redistributes a vendor route, but headquarters never learns it because the translator ABR has no usable advertisement.).

This option proposes: Apply route-reflector client roles and loop-prevention attributes to an iBGP topology that must scale beyond a full mesh. It addresses the different topic BGP route reflector and cluster loop prevention, not the directly tested NSSA type seven translation and default routing failure in the stated incident (An acquisition branch runs as an NSSA and redistributes a vendor route, but headquarters never learns it because the translator ABR has no usable advertisement.).

This option proposes: Apply route-reflector client roles and loop-prevention attributes to an iBGP topology that must scale beyond a full mesh. It addresses the different topic BGP route reflector and cluster loop prevention, not the directly tested NSSA type seven translation and default routing failure in the stated incident (A regional office converts its OSPF area from standard to NSSA and loses an expected external default after administrators assume all defaults are created automatically.).

This option proposes: Review broadcast-network designated-router election based on interface priority and router ID, noting that a stable election does not automatically preempt. It addresses the different topic OSPF broadcast DR and BDR election, not the directly tested NSSA type seven translation and default routing failure in the stated incident (A regional office converts its OSPF area from standard to NSSA and loses an expected external default after administrators assume all defaults are created automatically.).

This option proposes: Compare OSPF interface state, area, authentication, timers and network type before resetting a neighbor relationship. It addresses the different topic OSPF adjacency prerequisites and mismatched parameters, not the directly tested NSSA type seven translation and default routing failure in the stated incident (A regional office converts its OSPF area from standard to NSSA and loses an expected external default after administrators assume all defaults are created automatically.).

This option proposes: Inter-area OSPF design relies on a connected backbone area; virtual links can logically connect certain disconnected backbone segments through a suitable transit area but cannot pass through a stub area. It addresses the different topic OSPF backbone connectivity and virtual link design, not the directly tested NSSA type seven translation and default routing failure in the stated incident (A regional office converts its OSPF area from standard to NSSA and loses an expected external default after administrators assume all defaults are created automatically.).

This option proposes: PIM-DM generally follows a flood-and-prune model, building source-based multicast distribution where an interface without interested downstream receivers can be pruned to reduce unnecessary traffic. It addresses the different topic PIM dense mode flooding and prune mechanisms, not the directly tested NSSA type seven translation and default routing failure in the stated incident (A regional office converts its OSPF area from standard to NSSA and loses an expected external default after administrators assume all defaults are created automatically.).

This option proposes: Passive OSPF interfaces can stop unwanted neighbor discovery while their connected networks may still be advertised through the OSPF process; authentication protects routing exchanges and requires compatible peer settings. It addresses the different topic OSPF interface security and passive network advertisement, not the directly tested NSSA type seven translation and default routing failure in the stated incident (A regional office converts its OSPF area from standard to NSSA and loses an expected external default after administrators assume all defaults are created automatically.).

This option proposes: Check DR and BDR addresses, each neighbor's interface priority and router ID, network type and whether an election actually occurred. It addresses the different topic OSPF broadcast DR and BDR election, not the directly tested NSSA type seven translation and default routing failure in the stated incident (A regional office converts its OSPF area from standard to NSSA and loses an expected external default after administrators assume all defaults are created automatically.).

This option proposes: Compare candidate route validity, policy preferences, AS_PATH lengths, origins, MED, eBGP/iBGP learning mode and relevant platform-specific tie-break rules. It addresses the different topic BGP route preference sequence and policy precedence, not the directly tested NSSA type seven translation and default routing failure in the stated incident (A regional office converts its OSPF area from standard to NSSA and loses an expected external default after administrators assume all defaults are created automatically.).

This option proposes: Check whether the interface should form neighbors, its authentication mode, passive state, advertised prefix and neighboring device visibility. It addresses the different topic OSPF interface security and passive network advertisement, not the directly tested NSSA type seven translation and default routing failure in the stated incident (A regional office converts its OSPF area from standard to NSSA and loses an expected external default after administrators assume all defaults are created automatically.).

That option concerns OSPF interface security and passive network advertisement. That follows from the targeted Recommended action: Verify NSSA area behavior and type 7-to-type 5 translation when redistributing an external prefix inside a non-backbone area.

This option proposes: The selected BGP prefix has a resolvable next hop and traffic exits through the intended edge after the appropriate next-hop policy. It addresses the different topic BGP NEXT_HOP reachability and next-hop-self, not the directly tested NSSA type seven translation and default routing failure in the stated incident (A regional office converts its OSPF area from standard to NSSA and loses an expected external default after administrators assume all defaults are created automatically.). The better discriminating check for this case is: Trace the NSSA ASBR's type 7 LSA, translator ABR status, resulting type 5 advertisement outside the area and any intentionally configured default. The targeted correction is: Verify NSSA area behavior and type 7-to-type 5 translation when redistributing an external prefix inside a non-backbone area.

That option concerns OSPF SPF calculation and interface cost changes. That follows from the targeted Recommended action: Verify NSSA area behavior and type 7-to-type 5 translation when redistributing an external prefix inside a non-backbone area.

This option proposes: Configure a stub area on only one side of an OSPF adjacency and insist that an external type 5 LSA must cross that boundary unchanged. It addresses the different topic Stub and totally stub area restrictions, not the directly tested NSSA type seven translation and default routing failure in the stated incident (A regional office converts its OSPF area from standard to NSSA and loses an expected external default after administrators assume all defaults are created automatically.).

This option proposes: Treat successful UDP reachability to a VPN gateway as conclusive evidence that IKE authentication and IPsec child security associations are fully established. It addresses the different topic IPsec VPN IKE negotiation versus ESP data channel, not the directly tested NSSA type seven translation and default routing failure in the stated incident (A regional office converts its OSPF area from standard to NSSA and loses an expected external default after administrators assume all defaults are created automatically.).

This option proposes: Expect a newly connected router with priority 255 to immediately seize the DR role from a healthy established designated router with no new election. It addresses the different topic OSPF broadcast DR and BDR election, not the directly tested NSSA type seven translation and default routing failure in the stated incident (A regional office converts its OSPF area from standard to NSSA and loses an expected external default after administrators assume all defaults are created automatically.).

This option proposes: Check OSPF area type before attempting to import external routes into an area intended to suppress route detail. It addresses the different topic Stub and totally stub area restrictions, not the directly tested OSPF backbone connectivity and virtual link design failure in the stated incident (A growing enterprise introduces area 40 that connects only through area 20, and prefixes are inconsistent because area 0 is not properly joined.).

This option proposes: Troubleshoot a site-to-site IPsec tunnel by separating IKE security-association establishment from protected ESP payload transport. It addresses the different topic IPsec VPN IKE negotiation versus ESP data channel, not the directly tested OSPF backbone connectivity and virtual link design failure in the stated incident (A growing enterprise introduces area 40 that connects only through area 20, and prefixes are inconsistent because area 0 is not properly joined.).

This option proposes: Apply OSPF neighbor authentication and passive-interface policy without accidentally suppressing required route advertisements. It addresses the different topic OSPF interface security and passive network advertisement, not the directly tested OSPF backbone connectivity and virtual link design failure in the stated incident (A growing enterprise introduces area 40 that connects only through area 20, and prefixes are inconsistent because area 0 is not properly joined.).

This option proposes: IGMP reports express receiver interest in multicast groups and a querier maintains group membership state; without appropriate reports or queries a router can age out forwarding toward a segment. It addresses the different topic IGMP querier membership reports and group timeout, not the directly tested OSPF backbone connectivity and virtual link design failure in the stated incident (A growing enterprise introduces area 40 that connects only through area 20, and prefixes are inconsistent because area 0 is not properly joined.).

This option proposes: Passive OSPF interfaces can stop unwanted neighbor discovery while their connected networks may still be advertised through the OSPF process; authentication protects routing exchanges and requires compatible peer settings. It addresses the different topic OSPF interface security and passive network advertisement, not the directly tested OSPF backbone connectivity and virtual link design failure in the stated incident (A growing enterprise introduces area 40 that connects only through area 20, and prefixes are inconsistent because area 0 is not properly joined.).

This option proposes: An OSPF ASBR originates type 5 external LSAs in eligible areas; E1 metrics account for internal cost toward the ASBR, whereas E2 selection prioritizes external cost except for applicable tie-breakers. It addresses the different topic OSPF external LSAs and E1 versus E2 cost, not the directly tested OSPF backbone connectivity and virtual link design failure in the stated incident (A growing enterprise introduces area 40 that connects only through area 20, and prefixes are inconsistent because area 0 is not properly joined.).