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That option concerns IS-IS LAN DIS election. An overloaded IS-IS router can remain reachable while other routers avoid it as a transit path.

That option concerns Qualified-next-hop selection. An overloaded IS-IS router can remain reachable while other routers avoid it as a transit path.

Its routing remains area-local without an unintended Level-2 transit role is relevant to the different engineering topic "IS-IS Level-1/Level-2 reachability", but it is not the most directly supported operational verification evidence for this precise case: A core router continues advertising overload after maintenance completes. the best answer here is: Normal eligible transit paths resume once the overload condition clears.

Apply controlled route advertisement between Level-1 and Level-2 areas instead of relying on blanket reachability is relevant to the different engineering topic "IS-IS leaking between levels", but it is not the most directly supported technical design or decision for this precise case: An IS-IS adjacency fails immediately after an authentication key rotation. the best answer here is: Match IS-IS authentication configuration on participating interfaces and levels.

That option concerns VRRP virtual gateway failover. Authentication protects IS-IS protocol exchanges; mismatched keys or algorithms can stop adjacency or LSP acceptance.

That option concerns IS-IS overload bit maintenance. Authentication protects IS-IS protocol exchanges; mismatched keys or algorithms can stop adjacency or LSP acceptance.

That option concerns SR-MPLS shortest-path transport. Authentication protects IS-IS protocol exchanges; mismatched keys or algorithms can stop adjacency or LSP acceptance.

That option concerns IS-IS hello adjacency negotiation, not the requirement in this case.

Inspect which router is the DIS for the relevant level is relevant to the different engineering topic "IS-IS LAN DIS election", but it is not the most directly supported implementation and troubleshooting step for this precise case: An IS-IS adjacency fails immediately after an authentication key rotation. the best answer here is: Confirm matching authentication parameters without exposing secret material.

Only the approved network appears in the branch Level-1 routing view is relevant to the different engineering topic "IS-IS leaking between levels", but it is not the most directly supported operational verification evidence for this precise case: An IS-IS adjacency fails immediately after an authentication key rotation. the best answer here is: The intended adjacency restores while authentication stays enforced.

An RSVP session and operational MPLS LSP become visible is relevant to the different engineering topic "RSVP LSP signaling", but it is not the most directly supported operational verification evidence for this precise case: An IS-IS adjacency fails immediately after an authentication key rotation. the best answer here is: The intended adjacency restores while authentication stays enforced.

The chosen DIS advertises pseudonode information for the LAN is relevant to the different engineering topic "IS-IS LAN DIS election", but it is not the most directly supported operational verification evidence for this precise case: An IS-IS adjacency fails immediately after an authentication key rotation. the best answer here is: The intended adjacency restores while authentication stays enforced.

Verify LSP origination and flooding before assuming an IS-IS prefix is eligible for SPF is relevant to the different engineering topic "IS-IS link-state database", but it is not the most directly supported technical design or decision for this precise case: A router receives hellos but does not accept valid LSP updates. the best answer here is: Match IS-IS authentication configuration on participating interfaces and levels.

That option concerns OSPF DR/BDR priority election. Authentication protects IS-IS protocol exchanges; mismatched keys or algorithms can stop adjacency or LSP acceptance.

Use supported wide IS-IS metrics to reflect link cost and network design at the correct level is relevant to the different engineering topic "IS-IS wide metrics", but it is not the most directly supported technical design or decision for this precise case: A router receives hellos but does not accept valid LSP updates. the best answer here is: Match IS-IS authentication configuration on participating interfaces and levels.

That option concerns BGP best-path selection order. Authentication protects IS-IS protocol exchanges; mismatched keys or algorithms can stop adjacency or LSP acceptance.

That option concerns IS-IS TLV reachability advertisements. Authentication protects IS-IS protocol exchanges; mismatched keys or algorithms can stop adjacency or LSP acceptance.

Observe the new DIS election and LSP convergence is relevant to the different engineering topic "IS-IS LAN DIS election", but it is not the most directly supported implementation and troubleshooting step for this precise case: A router receives hellos but does not accept valid LSP updates. the best answer here is: Inspect level-specific authentication and rejection counters.

Database convergence restores the intended reachability without stale entries is relevant to the different engineering topic "IS-IS link-state database", but it is not the most directly supported operational verification evidence for this precise case: A router receives hellos but does not accept valid LSP updates. the best answer here is: Accepted LSPs correspond to authenticated peers.

The pseudonode reflects the selected DIS after the topology stabilizes is relevant to the different engineering topic "IS-IS LAN DIS election", but it is not the most directly supported operational verification evidence for this precise case: A router receives hellos but does not accept valid LSP updates. the best answer here is: Accepted LSPs correspond to authenticated peers.

That option concerns MSTP region consistency. Authentication protects IS-IS protocol exchanges; mismatched keys or algorithms can stop adjacency or LSP acceptance.

That option concerns IS-IS LAN DIS election. IS-IS Level-1/Level-2 route advertisement follows configured policies and defaults; prefix leaking is a deliberate design choice.

That option concerns OSPF interface metric selection. IS-IS Level-1/Level-2 route advertisement follows configured policies and defaults; prefix leaking is a deliberate design choice.

Use the IS-IS overload bit to discourage unwanted transit through a router during constrained operation is relevant to the different engineering topic "IS-IS overload bit maintenance", but it is not the most directly supported technical design or decision for this precise case: A branch area needs one approved external route from the Level-2 backbone. the best answer here is: Apply controlled route advertisement between Level-1 and Level-2 areas instead of relying on blanket reachability.

Generate unique system identifiers and configure their intended NET addresses is relevant to the different engineering topic "IS-IS NET addressing", but it is not the most directly supported implementation and troubleshooting step for this precise case: A branch area needs one approved external route from the Level-2 backbone. the best answer here is: Configure supported controlled Level-2-to-Level-1 route leaking as appropriate.

That option concerns Loop protection when BPDUs vanish. IS-IS Level-1/Level-2 route advertisement follows configured policies and defaults; prefix leaking is a deliberate design choice.

Inspect the originating and received IS-IS LSP database entries is relevant to the different engineering topic "IS-IS link-state database", but it is not the most directly supported implementation and troubleshooting step for this precise case: A branch area needs one approved external route from the Level-2 backbone. the best answer here is: Configure supported controlled Level-2-to-Level-1 route leaking as appropriate.

The network prefix appears in the appropriate LSP and becomes eligible for route calculation is relevant to the different engineering topic "IS-IS link-state database", but it is not the most directly supported operational verification evidence for this precise case: A branch area needs one approved external route from the Level-2 backbone. the best answer here is: Only the approved network appears in the branch Level-1 routing view.

That option concerns STP root bridge placement. IS-IS Level-1/Level-2 route advertisement follows configured policies and defaults; prefix leaking is a deliberate design choice.

Transit traffic avoids it while routing state becomes ready is relevant to the different engineering topic "IS-IS overload bit maintenance", but it is not the most directly supported operational verification evidence for this precise case: A branch area needs one approved external route from the Level-2 backbone. the best answer here is: Only the approved network appears in the branch Level-1 routing view.

That option concerns MPLS route and forwarding tables. IS-IS Level-1/Level-2 route advertisement follows configured policies and defaults; prefix leaking is a deliberate design choice.

Use supported wide IS-IS metrics to reflect link cost and network design at the correct level is relevant to the different engineering topic "IS-IS wide metrics", but it is not the most directly supported technical design or decision for this precise case: A Level-1 prefix must be known outside its area for service reachability. the best answer here is: Apply controlled route advertisement between Level-1 and Level-2 areas instead of relying on blanket reachability.

Interpret IS-IS TLVs as typed data for advertised topology, protocol reachability and capabilities is relevant to the different engineering topic "IS-IS TLV reachability advertisements", but it is not the most directly supported technical design or decision for this precise case: A Level-1 prefix must be known outside its area for service reachability. the best answer here is: Apply controlled route advertisement between Level-1 and Level-2 areas instead of relying on blanket reachability.