The alternative targets missing default gateway, where traffic bound for other subnets needs a reachable Layer 3 next hop; a functioning local broadcast domain does not provide routing. It does not establish the intended route missing in correct VRF behavior described in the scenario.

Stateful firewalls can drop replies they did not see established; checking only the outbound route misses asymmetric forwarding. Trace both forward and return paths through stateful security boundaries. would address asymmetric path enforcement, but the reported facts instead point to route missing in correct VRF. That change would leave the actual requirement unresolved.

That action—Trace DHCP relay, VLAN forwarding and server responses after successful WLAN authentication—is relevant to wireless DHCP failure stage. Client association and 802.1X success occur before address allocation; VLAN or relay faults can prevent DHCP without an RF fault. It does not correct the observed route missing in correct VRF condition.

That action—Check the endpoint's 802.1X supplicant configuration and initial EAPOL exchange—is relevant to 802.1X supplicant disabled. An authentication server cannot authorize an endpoint that never initiates the intended EAP handshake on the controlled link. It does not correct the observed captive portal redirect fault condition.

The alternative targets missing default gateway, where traffic bound for other subnets needs a reachable Layer 3 next hop; a functioning local broadcast domain does not provide routing. It does not establish the intended captive portal redirect fault behavior described in the scenario.

Strong signal cannot cure collisions or non-Wi-Fi interference; airtime contention and retransmission consume the shared radio medium. Measure channel utilization, interference and retries before changing AP power. would address RF interference and retries, but the reported facts instead point to captive portal redirect fault. That change would leave the actual requirement unresolved.

Successful application traffic is only half of policy correctness; overbroad authorization can create exposure while the reported symptom appears resolved. The indicated result—positive and negative flow tests confirm approved connectivity and continuing rejection of disallowed destinations—checks a different mechanism and would not confirm the required certificate expiry monitoring outcome.

This would validate configuration revision and approval history, not certificate expiry monitoring. Auditability requires associating control-plane changes with an identity, time, reason and prior state, not just the new value. It is therefore insufficient acceptance evidence for the reported condition.

That result—A pilot validates critical services and the production plan provides checkpoints, maintenance windows and restoration conditions—concerns firmware rollout staging. Software changes can alter forwarding, management or authentication behavior, so a limited pilot provides evidence before broad deployment. It can be healthy even while the current certificate expiry monitoring problem remains.

The alternative targets roaming reassociation delay, where roaming quality depends on usable overlap and timely client/security transitions; stationary speed tests cannot diagnose roaming interruption. It does not establish the intended spanning-tree blocked forwarding behavior described in the scenario.

Repeated link transitions and frame errors point to Layer 1 quality or negotiation rather than an unseen WLAN authentication issue. Inspect and test the physical medium, transceiver and negotiated interface state before changing higher-layer policy. would address physical layer link fault, but the reported facts instead point to spanning-tree blocked forwarding. That change would leave the actual requirement unresolved.

That action—Inspect the switch's per-port and aggregate PoE allocation against endpoint power requirements—is relevant to power-over-Ethernet failure. A data VLAN or management group cannot correct a switch power budget that denies the PD enough electrical power. It does not correct the observed spanning-tree blocked forwarding condition.

VSX peers retain independent control planes and only designated supported feature sets synchronize; unchecked settings may diverge. Configure and verify explicit VSX synchronization for supported shared features while managing independent settings separately. would address VSX peer synchronization, but the reported facts instead point to new Central scoped inheritance. That change would leave the actual requirement unresolved.

The alternative targets central device inventory onboarding, where a functioning Ethernet link does not establish cloud-management ownership; onboarding requires the correct device identity, management association and supported connectivity. It does not establish the intended new Central scoped inheritance behavior described in the scenario.

That action—Distinguish Central's site/location assignment from the group-based configuration scope in Classic Central—is relevant to classic Central site versus group. Classic Central uses groups to distribute shared configuration while sites provide physical-location organization, so modifying location alone need not change running intent. It does not correct the observed new Central scoped inheritance condition.

If IP connectivity works but hostname access fails, DNS queries, responses or resolver policy may be broken despite healthy network routes. The indicated result—the client resolves the intended address using the approved DNS server and connects using the application hostname—checks a different mechanism and would not confirm the required missing default gateway outcome.

This would validate OSPF prefix advertisement omission, not missing default gateway. A healthy neighbor relationship does not imply every desired route is present; network statements, redistribution and policy can omit a prefix. It is therefore insufficient acceptance evidence for the reported condition.

That result—The intended peer-access policy is confirmed and permitted test clients connect while prohibited peers remain isolated—concerns client isolation and peer access. Client isolation can intentionally prevent peer-to-peer wireless communication despite successful association, addressing and external reachability. It can be healthy even while the current missing default gateway problem remains.

Successful reboot and version display do not establish that all intended policies and interface behaviors survived the change. The indicated result—the post-upgrade configuration matches approved intent and critical wired/wireless service tests pass—checks a different mechanism and would not confirm the required power-over-Ethernet failure outcome.

That result—The bundle shows all intended collecting/distributing members with consistent partner and interface parameters—concerns LACP partner mismatch. LACP only selects compatible links for aggregation; forcing an incompatible member can create unexpected hashing or forwarding behavior. It can be healthy even while the current power-over-Ethernet failure problem remains.

This would validate optics compatibility and signal levels, not power-over-Ethernet failure. An unsupported or poorly coupled optical path prevents reliable Ethernet signalling regardless of correct routing or authentication configuration. It is therefore insufficient acceptance evidence for the reported condition.

A data VLAN or management group cannot correct a switch power budget that denies the PD enough electrical power. Inspect the switch's per-port and aggregate PoE allocation against endpoint power requirements. would address power-over-Ethernet failure, but the reported facts instead point to LACP partner mismatch. That change would leave the actual requirement unresolved.

The alternative targets duplex and speed negotiation, where mismatched physical link parameters can create collisions or errors despite a link-up status, so higher-layer policy changes cannot repair them. It does not establish the intended LACP partner mismatch behavior described in the scenario.

That action—Compare OSPF area and interface parameters between the two peers—is relevant to OSPF neighbor area mismatch. OSPF requires compatible area identity, network type and essential adjacency parameters; IP reachability alone does not establish a neighbor. It does not correct the observed LACP partner mismatch condition.

MAC authentication can support devices without a supplicant but is weaker than cryptographic identity, so narrow policy and inventory are essential. The indicated result—the registered device reaches only its designated services and unknown MAC identities are denied or quarantined—checks a different mechanism and would not confirm the required wired 802.1X port control outcome.

That result—The effective device configuration reflects documented scoped intent and any deliberate higher-priority exception—concerns new Central scoped inheritance. New Central includes global, collection, site and device scopes; more specific applicable configuration can override broader inherited values. It can be healthy even while the current wired 802.1X port control problem remains.

This would validate SSID-to-forwarding path consistency, not wired 802.1X port control. Wireless association is only the first hop; downstream tunnel, VLAN and gateway mappings must agree for application access. It is therefore insufficient acceptance evidence for the reported condition.

That result—A walk test records acceptable handoff delay and voice packet loss under normal movement paths—concerns roaming voice latency. Fast reliable handoff requires compatible client capabilities, adequate AP overlap and secure authentication continuity rather than just increasing bandwidth. It can be healthy even while the current optimization with rollback problem remains.

Infrastructure availability is necessary but not sufficient for usable service; end-to-end user journeys expose service dependencies beyond device health. The indicated result—synthetic or real-user results show acceptable authentication, address acquisition, DNS and application response at representative sites—checks a different mechanism and would not confirm the required optimization with rollback outcome.

This would validate energy and utilization efficiency, not optimization with rollback. Right-sized operation reduces unnecessary resource use, but energy or capacity savings must not remove availability when users actually need the network. It is therefore insufficient acceptance evidence for the reported condition.

The alternative targets ACL deny versus service outage, where an ACL can block selected Layer 4 flows while other connectivity remains healthy; removing all controls is an unsafe shortcut. It does not establish the intended MAC authentication fallback fault behavior described in the scenario.

That action—Apply appropriate IPv6 RA protection on untrusted access ports—is relevant to IPv6 router-advertisement spoofing. IPv4 ARP safeguards do not inspect ICMPv6 router announcements; RA protection constrains unauthorized router information on client segments. It does not correct the observed MAC authentication fallback fault condition.

The VLAN used for an untagged or dynamically authorized session determines its broadcast and DHCP context; physical link state is not enough. Inspect the effective access VLAN and any role-based VLAN override on the affected port. would address access VLAN misassignment, but the reported facts instead point to MAC authentication fallback fault. That change would leave the actual requirement unresolved.