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This option proposes: Inspect compatible IS-IS NET area IDs, interface levels and authentication before changing a routing process after adjacency failure. It addresses the different topic IS-IS area addresses and adjacency prerequisites, not the directly tested IS-IS LSP synchronization using CSNP and PSNP failure in the stated incident (An IS-IS broadcast circuit repeatedly floods the same LSP while the DIS summary shows older entries and convergence stalls.).

This option proposes: Analyze Virtual Router Redundancy Protocol master election using priorities and the virtual router ID instead of a router's physical interface address alone. It addresses the different topic VRRP master election priority and tie breaks, not the directly tested IS-IS LSP synchronization using CSNP and PSNP failure in the stated incident (An IS-IS broadcast circuit repeatedly floods the same LSP while the DIS summary shows older entries and convergence stalls.).

This option proposes: Distinguish level-1 area routing from level-2 backbone-style interarea routing when troubleshooting a missing destination. It addresses the different topic IS-IS level one versus level two reachability, not the directly tested IS-IS LSP synchronization using CSNP and PSNP failure in the stated incident (An IS-IS broadcast circuit repeatedly floods the same LSP while the DIS summary shows older entries and convergence stalls.).

This option proposes: IS-IS uses CLNS-based network entities and level-specific hellos; level-1 neighbors normally require compatible area membership, while level-2 adjacencies have different area constraints and still need link and authentication compatibility. It addresses the different topic IS-IS area addresses and adjacency prerequisites, not the directly tested IS-IS LSP synchronization using CSNP and PSNP failure in the stated incident (An IS-IS broadcast circuit repeatedly floods the same LSP while the DIS summary shows older entries and convergence stalls.).

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 IS-IS LSP synchronization using CSNP and PSNP failure in the stated incident (An IS-IS broadcast circuit repeatedly floods the same LSP while the DIS summary shows older entries and convergence stalls.).

This option proposes: An NSSA permits its local ASBR to originate type 7 external LSAs that can be translated to type 5 by an eligible ABR, while incoming external type 5 advertisements are not flooded into the NSSA. It addresses the different topic NSSA type seven translation and default routing, not the directly tested IS-IS LSP synchronization using CSNP and PSNP failure in the stated incident (An IS-IS broadcast circuit repeatedly floods the same LSP while the DIS summary shows older entries and convergence stalls.).

This option proposes: Inspect BFD discriminator and session state, timer negotiations, neighbor addresses, routing protocol binding and actual packet-loss observations. It addresses the different topic BFD rapid session detection and routing protocol association, not the directly tested IS-IS LSP synchronization using CSNP and PSNP failure in the stated incident (An IS-IS broadcast circuit repeatedly floods the same LSP while the DIS summary shows older entries and convergence stalls.).

This option proposes: Review neighbor state, interface circuit type, NET/area values, hello packets, MTU checks and matching authentication configuration. It addresses the different topic IS-IS area addresses and adjacency prerequisites, not the directly tested IS-IS LSP synchronization using CSNP and PSNP failure in the stated incident (An IS-IS broadcast circuit repeatedly floods the same LSP while the DIS summary shows older entries and convergence stalls.).

This option proposes: Examine the level-1 and level-2 routing tables, leak policy, LSP overload flags and route next hops before modifying metric preferences. It addresses the different topic IS-IS routing leakage and overload bit, not the directly tested IS-IS LSP synchronization using CSNP and PSNP failure in the stated incident (An IS-IS broadcast circuit repeatedly floods the same LSP while the DIS summary shows older entries and convergence stalls.).

That option concerns IS-IS routing leakage and overload bit. That follows from the targeted Recommended action: Trace IS-IS link-state synchronization through LSP sequence numbers and summary or acknowledgment PDUs when databases differ.

That option concerns Stateful firewall sessions versus basic packet ACL filtering. That follows from the targeted Recommended action: Trace IS-IS link-state synchronization through LSP sequence numbers and summary or acknowledgment PDUs when databases differ.

That option concerns IS-IS designated intermediate system and pseudonode. That follows from the targeted Recommended action: Trace IS-IS link-state synchronization through LSP sequence numbers and summary or acknowledgment PDUs when databases differ.

This option proposes: Ignore a router's active IS-IS overload bit and force all area-to-area traffic through it because its loopback is reachable. It addresses the different topic IS-IS routing leakage and overload bit, not the directly tested IS-IS LSP synchronization using CSNP and PSNP failure in the stated incident (An IS-IS broadcast circuit repeatedly floods the same LSP while the DIS summary shows older entries and convergence stalls.).

This option proposes: Assume an IS-IS level-1-only router automatically has complete routes to all other areas without an L1/L2 exit or explicit reachability. It addresses the different topic IS-IS level one versus level two reachability, not the directly tested IS-IS LSP synchronization using CSNP and PSNP failure in the stated incident (An IS-IS broadcast circuit repeatedly floods the same LSP while the DIS summary shows older entries and convergence stalls.).

This option proposes: Assume two routes with the same IPv4 prefix in different VRFs automatically merge into the global routing table and communicate freely. It addresses the different topic VRF traffic separation and route leaking controls, not the directly tested IS-IS LSP synchronization using CSNP and PSNP failure in the stated incident (An IS-IS broadcast circuit repeatedly floods the same LSP while the DIS summary shows older entries and convergence stalls.).

This option proposes: Inspect compatible IS-IS NET area IDs, interface levels and authentication before changing a routing process after adjacency failure. It addresses the different topic IS-IS area addresses and adjacency prerequisites, not the directly tested IS-IS routing leakage and overload bit failure in the stated incident (A core router enters an overload state during a planned restart, yet operators expect its IS-IS neighbors to keep forwarding transit traffic through it unchanged.).

This option proposes: Distinguish level-1 area routing from level-2 backbone-style interarea routing when troubleshooting a missing destination. It addresses the different topic IS-IS level one versus level two reachability, not the directly tested IS-IS routing leakage and overload bit failure in the stated incident (A core router enters an overload state during a planned restart, yet operators expect its IS-IS neighbors to keep forwarding transit traffic through it unchanged.).

This option proposes: Diagnose RSTP forwarding state by identifying root, designated and alternate ports and the topology's point-to-point characteristics. It addresses the different topic RSTP port roles and rapid convergence, not the directly tested IS-IS routing leakage and overload bit failure in the stated incident (A core router enters an overload state during a planned restart, yet operators expect its IS-IS neighbors to keep forwarding transit traffic through it unchanged.).

This option proposes: IS-IS uses CLNS-based network entities and level-specific hellos; level-1 neighbors normally require compatible area membership, while level-2 adjacencies have different area constraints and still need link and authentication compatibility. It addresses the different topic IS-IS area addresses and adjacency prerequisites, not the directly tested IS-IS routing leakage and overload bit failure in the stated incident (A core router enters an overload state during a planned restart, yet operators expect its IS-IS neighbors to keep forwarding transit traffic through it unchanged.).

This option proposes: In IS-IS, level-1 routers exchange area-local routes while level-2 routers connect areas; an L1/L2 router can provide an appropriate exit and the attached indication informs L1 routing behavior. It addresses the different topic IS-IS level one versus level two reachability, not the directly tested IS-IS routing leakage and overload bit failure in the stated incident (A core router enters an overload state during a planned restart, yet operators expect its IS-IS neighbors to keep forwarding transit traffic through it unchanged.).

This option proposes: A Virtual Routing and Forwarding instance keeps a distinct routing table for assigned interfaces, and inter-VRF connectivity needs explicit appropriate route sharing or security-controlled transit rather than an assumption of global-table access. It addresses the different topic VRF traffic separation and route leaking controls, not the directly tested IS-IS routing leakage and overload bit failure in the stated incident (A core router enters an overload state during a planned restart, yet operators expect its IS-IS neighbors to keep forwarding transit traffic through it unchanged.).

This option proposes: Inspect LAN IIH priorities, elected DIS system ID, pseudonode LSPs and neighbor topology before changing interface priority. It addresses the different topic IS-IS designated intermediate system and pseudonode, not the directly tested IS-IS routing leakage and overload bit failure in the stated incident (A core router enters an overload state during a planned restart, yet operators expect its IS-IS neighbors to keep forwarding transit traffic through it unchanged.).

This option proposes: Compare LSP identifiers, sequence numbers, aging, CSNP summaries, PSNP entries and adjacency state on the affected circuit. It addresses the different topic IS-IS LSP synchronization using CSNP and PSNP, not the directly tested IS-IS routing leakage and overload bit failure in the stated incident (A core router enters an overload state during a planned restart, yet operators expect its IS-IS neighbors to keep forwarding transit traffic through it unchanged.).

This option proposes: Trace the NSSA ASBR's type 7 LSA, translator ABR status, resulting type 5 advertisement outside the area and any intentionally configured default. It addresses the different topic NSSA type seven translation and default routing, not the directly tested IS-IS routing leakage and overload bit failure in the stated incident (A core router enters an overload state during a planned restart, yet operators expect its IS-IS neighbors to keep forwarding transit traffic through it unchanged.).

That option concerns IS-IS level one versus level two reachability. That follows from the targeted action: Check IS-IS level-1-to-level-2 route leaking and the overload bit before selecting a device as a transit path.

That option concerns IS-IS designated intermediate system and pseudonode. That follows from the targeted action: Check IS-IS level-1-to-level-2 route leaking and the overload bit before selecting a device as a transit path.

That option concerns DHCP relay across a routed user VLAN. That follows from the targeted action: Check IS-IS level-1-to-level-2 route leaking and the overload bit before selecting a device as a transit path.

This option proposes: Trace IS-IS link-state synchronization through LSP sequence numbers and summary or acknowledgment PDUs when databases differ. It addresses the different topic IS-IS LSP synchronization using CSNP and PSNP, not the directly tested IS-IS routing leakage and overload bit failure in the stated incident (A regional L1/L2 router learns a branch prefix but another area does not; the team needs to identify whether configured interlevel route leaking is missing.).

This option proposes: Validate resilient AC roles and per-user access decisions when WLAN controller failure or endpoint authorization affects service. It addresses the different topic WLAN controller redundancy and NAC integration, not the directly tested IS-IS routing leakage and overload bit failure in the stated incident (A regional L1/L2 router learns a branch prefix but another area does not; the team needs to identify whether configured interlevel route leaking is missing.).

This option proposes: Inspect compatible IS-IS NET area IDs, interface levels and authentication before changing a routing process after adjacency failure. It addresses the different topic IS-IS area addresses and adjacency prerequisites, not the directly tested IS-IS routing leakage and overload bit failure in the stated incident (A regional L1/L2 router learns a branch prefix but another area does not; the team needs to identify whether configured interlevel route leaking is missing.).

This option proposes: The IS-IS designated intermediate system generates pseudonode LSP information for a broadcast LAN, and IS-IS does not create an OSPF-style backup designated intermediate system for the same segment. It addresses the different topic IS-IS designated intermediate system and pseudonode, not the directly tested IS-IS routing leakage and overload bit failure in the stated incident (A regional L1/L2 router learns a branch prefix but another area does not; the team needs to identify whether configured interlevel route leaking is missing.).

This option proposes: VRRP uses a virtual router identity and virtual MAC per IPv4 group to preserve a stable next-hop identity across master changes; correct failover still requires matching VLAN, neighbor learning and eligible router state. It addresses the different topic VRRP virtual MAC and endpoint ARP continuity, not the directly tested IS-IS routing leakage and overload bit failure in the stated incident (A regional L1/L2 router learns a branch prefix but another area does not; the team needs to identify whether configured interlevel route leaking is missing.).

This option proposes: IS-IS floods LSPs and uses Complete Sequence Number PDUs and Partial Sequence Number PDUs to summarize holdings, request missing LSPs and acknowledge entries depending on circuit behavior. It addresses the different topic IS-IS LSP synchronization using CSNP and PSNP, not the directly tested IS-IS routing leakage and overload bit failure in the stated incident (A regional L1/L2 router learns a branch prefix but another area does not; the team needs to identify whether configured interlevel route leaking is missing.).