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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 IS-IS designated intermediate system and pseudonode failure in the stated incident (A network operator changes interface DIS priority during maintenance and needs to identify which pseudonode LSPs should change on that LAN.).

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 designated intermediate system and pseudonode failure in the stated incident (A network operator changes interface DIS priority during maintenance and needs to identify which pseudonode LSPs should change on that LAN.).

This option proposes: Assess fast roaming within and between AP coverage cells using the configured mobility relationship and authentication requirements. It addresses the different topic Wireless roaming mobility and session continuity, not the directly tested IS-IS designated intermediate system and pseudonode failure in the stated incident (A network operator changes interface DIS priority during maintenance and needs to identify which pseudonode LSPs should change on that LAN.).

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 designated intermediate system and pseudonode failure in the stated incident (A network operator changes interface DIS priority during maintenance and needs to identify which pseudonode LSPs should change on that LAN.).

This option proposes: LOCAL_PREF is an intra-AS BGP path attribute, with larger values generally preferred at its stage of best-path selection; it is not normally advertised to eBGP neighbors. It addresses the different topic BGP LOCAL_PREF within one autonomous system, not the directly tested IS-IS designated intermediate system and pseudonode failure in the stated incident (A network operator changes interface DIS priority during maintenance and needs to identify which pseudonode LSPs should change on that LAN.).

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 designated intermediate system and pseudonode failure in the stated incident (A network operator changes interface DIS priority during maintenance and needs to identify which pseudonode LSPs should change on that LAN.).

This option proposes: Inspect the client's DHCP Discover/Offer exchange, relay agent address, server route, configured pool and interface addressing. It addresses the different topic DHCP relay across a routed user VLAN, not the directly tested IS-IS designated intermediate system and pseudonode failure in the stated incident (A network operator changes interface DIS priority during maintenance and needs to identify which pseudonode LSPs should change on that LAN.).

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 designated intermediate system and pseudonode failure in the stated incident (A network operator changes interface DIS priority during maintenance and needs to identify which pseudonode LSPs should change on that LAN.).

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 designated intermediate system and pseudonode failure in the stated incident (A network operator changes interface DIS priority during maintenance and needs to identify which pseudonode LSPs should change on that LAN.).

That option concerns IS-IS area addresses and adjacency prerequisites. That follows from the targeted Recommended action: Explain the DIS role on broadcast IS-IS circuits and why it differs from an OSPF DR/BDR election.

That option concerns IS-IS level one versus level two reachability. That follows from the targeted Recommended action: Explain the DIS role on broadcast IS-IS circuits and why it differs from an OSPF DR/BDR election.

That option concerns OSPF external LSAs and E1 versus E2 cost. That follows from the targeted Recommended action: Explain the DIS role on broadcast IS-IS circuits and why it differs from an OSPF DR/BDR election.

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 designated intermediate system and pseudonode failure in the stated incident (A network operator changes interface DIS priority during maintenance and needs to identify which pseudonode LSPs should change on that LAN.).

This option proposes: Diagnose an unexpected OSPF intra-area path by comparing cumulative interface costs through the shortest-path tree. It addresses the different topic OSPF SPF calculation and interface cost changes, not the directly tested IS-IS designated intermediate system and pseudonode failure in the stated incident (A network operator changes interface DIS priority during maintenance and needs to identify which pseudonode LSPs should change on that LAN.).

This option proposes: Diagnose a packet-forwarding discrepancy by separating control-plane routes recorded in the RIB from hardware or software forwarding entries installed in the FIB. It addresses the different topic Network forwarding planes RIB versus FIB, not the directly tested IS-IS designated intermediate system and pseudonode failure in the stated incident (A network operator changes interface DIS priority during maintenance and needs to identify which pseudonode LSPs should change on that LAN.).

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 LSP synchronization using CSNP and PSNP failure in the stated incident (Two IS-IS neighbors remain up but report different topology after a packet-loss episode, and the engineer observes PSNP requests for missing LSPs.).

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 (Two IS-IS neighbors remain up but report different topology after a packet-loss episode, and the engineer observes PSNP requests for missing LSPs.).

This option proposes: Explain the DIS role on broadcast IS-IS circuits and why it differs from an OSPF DR/BDR election. It addresses the different topic IS-IS designated intermediate system and pseudonode, not the directly tested IS-IS LSP synchronization using CSNP and PSNP failure in the stated incident (Two IS-IS neighbors remain up but report different topology after a packet-loss episode, and the engineer observes PSNP requests for missing LSPs.).

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 LSP synchronization using CSNP and PSNP failure in the stated incident (Two IS-IS neighbors remain up but report different topology after a packet-loss episode, and the engineer observes PSNP requests for missing LSPs.).

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 IS-IS LSP synchronization using CSNP and PSNP failure in the stated incident (Two IS-IS neighbors remain up but report different topology after a packet-loss episode, and the engineer observes PSNP requests for missing LSPs.).

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 (Two IS-IS neighbors remain up but report different topology after a packet-loss episode, and the engineer observes PSNP requests for missing LSPs.).

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 (Two IS-IS neighbors remain up but report different topology after a packet-loss episode, and the engineer observes PSNP requests for missing LSPs.).

This option proposes: Inspect local and remote BFD configured minima, actual negotiated intervals, multiplier values, CPU pressure and observed detection timestamps. It addresses the different topic BFD detection multiplier and negotiated timers, not the directly tested IS-IS LSP synchronization using CSNP and PSNP failure in the stated incident (Two IS-IS neighbors remain up but report different topology after a packet-loss episode, and the engineer observes PSNP requests for missing LSPs.).

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 (Two IS-IS neighbors remain up but report different topology after a packet-loss episode, and the engineer observes PSNP requests for missing LSPs.).

That option concerns IS-IS area addresses and adjacency prerequisites. That follows from the targeted action: Trace IS-IS link-state synchronization through LSP sequence numbers and summary or acknowledgment PDUs when databases differ.

That option concerns IS-IS level one versus level two reachability. That follows from the targeted action: Trace IS-IS link-state synchronization through LSP sequence numbers and summary or acknowledgment PDUs when databases differ.

That option concerns IGMPv3 source-specific selection and SSM. That follows from the targeted action: Trace IS-IS link-state synchronization through LSP sequence numbers and summary or acknowledgment PDUs when databases differ.

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 IS-IS LSP synchronization using CSNP and PSNP failure in the stated incident (Two IS-IS neighbors remain up but report different topology after a packet-loss episode, and the engineer observes PSNP requests for missing LSPs.).

This option proposes: Investigate IPv6 neighbor resolution using ICMPv6 Neighbor Solicitation and Neighbor Advertisement rather than IPv4 ARP assumptions. It addresses the different topic IPv6 neighbor discovery NS NA and address resolution, not the directly tested IS-IS LSP synchronization using CSNP and PSNP failure in the stated incident (Two IS-IS neighbors remain up but report different topology after a packet-loss episode, and the engineer observes PSNP requests for missing LSPs.).

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 LSP synchronization using CSNP and PSNP failure in the stated incident (Two IS-IS neighbors remain up but report different topology after a packet-loss episode, and the engineer observes PSNP requests for missing LSPs.).

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.).