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Inspect the MAC forwarding table for the relevant VLAN and physical interface is relevant to the different engineering topic "MAC-address dynamic learning", but it is not the most directly supported implementation and troubleshooting step for this precise case: A tagged customer handoff fails while adjacent VLANs remain healthy. the best answer here is: Inspect show vlans and show ethernet-switching table with port membership.

Configure an approved VLAN tag mapping without changing unrelated services is relevant to the different engineering topic "VLAN translation distinction", but it is not the most directly supported implementation and troubleshooting step for this precise case: A tagged customer handoff fails while adjacent VLANs remain healthy. the best answer here is: Inspect show vlans and show ethernet-switching table with port membership.

That option concerns STP root and designated port roles. VLAN interface state and learned MAC entries reveal different parts of the access-to-trunk forwarding path.

That option concerns Trunk tagging and VLAN allowlist. VLAN interface state and learned MAC entries reveal different parts of the access-to-trunk forwarding path.

That option concerns IPv6 link-local next-hop scope. VLAN interface state and learned MAC entries reveal different parts of the access-to-trunk forwarding path.

Flooding decreases once the destination MAC is learned is relevant to the different engineering topic "Unknown unicast and flooding", but it is not the most directly supported operational verification evidence for this precise case: A tagged customer handoff fails while adjacent VLANs remain healthy. the best answer here is: The VLAN and learned endpoint mapping match the service design.

Diagnose Ethernet MAC learning by VLAN and ingress port before changing bridge forwarding policy is relevant to the different engineering topic "MAC-address dynamic learning", but it is not the most directly supported technical design or decision for this precise case: A trunk supports a customer VLAN but learns its source MAC on the wrong interface. the best answer here is: Inspect VLAN membership and Ethernet-switching MAC tables to confirm layer-2 implementation.

Treat the trunk native VLAN as a deliberate untagged-frame mapping, not a generic security bypass is relevant to the different engineering topic "Native VLAN and untagged trunk behavior", but it is not the most directly supported technical design or decision for this precise case: A trunk supports a customer VLAN but learns its source MAC on the wrong interface. the best answer here is: Inspect VLAN membership and Ethernet-switching MAC tables to confirm layer-2 implementation.

That option concerns IS-IS overload bit maintenance. VLAN interface state and learned MAC entries reveal different parts of the access-to-trunk forwarding path.

That option concerns IS-IS LAN DIS election. VLAN interface state and learned MAC entries reveal different parts of the access-to-trunk forwarding path.

Check access VLAN assignment and port state is relevant to the different engineering topic "Access port VLAN membership", but it is not the most directly supported implementation and troubleshooting step for this precise case: A trunk supports a customer VLAN but learns its source MAC on the wrong interface. the best answer here is: Compare VLAN-to-port mapping and underlying physical connectivity.

That option concerns Integrated routing and bridging. VLAN interface state and learned MAC entries reveal different parts of the access-to-trunk forwarding path.

That option concerns IS-IS wide metrics. VLAN interface state and learned MAC entries reveal different parts of the access-to-trunk forwarding path.

That option concerns Provider bridging Q-in-Q. VLAN interface state and learned MAC entries reveal different parts of the access-to-trunk forwarding path.

Untagged traffic is consistently mapped and unrelated tenant VLANs remain isolated is relevant to the different engineering topic "Native VLAN and untagged trunk behavior", but it is not the most directly supported operational verification evidence for this precise case: A trunk supports a customer VLAN but learns its source MAC on the wrong interface. the best answer here is: The MAC table correctly points to the intended handoff after repair.

Check BPDU exchange and control-plane filtering when spanning-tree connectivity is unstable is relevant to the different engineering topic "BPDU visibility on trunks", but it is not the most directly supported technical design or decision for this precise case: A new access switch unexpectedly wins root election for a shared enterprise VLAN. the best answer here is: Plan bridge priority so the intended resilient aggregation switch is root for a spanning-tree topology.

That option concerns IPv6-over-IPv4 tunnel migration. The root bridge establishes the reference point for STP path cost and port-role decisions.

Interpret root, designated and alternate port roles relative to the elected bridge is relevant to the different engineering topic "STP root and designated port roles", but it is not the most directly supported technical design or decision for this precise case: A new access switch unexpectedly wins root election for a shared enterprise VLAN. the best answer here is: Plan bridge priority so the intended resilient aggregation switch is root for a spanning-tree topology.

That option concerns MPLS push swap pop forwarding. The root bridge establishes the reference point for STP path cost and port-role decisions.

Inspect roles and path costs across both uplinks is relevant to the different engineering topic "STP root and designated port roles", but it is not the most directly supported implementation and troubleshooting step for this precise case: A new access switch unexpectedly wins root election for a shared enterprise VLAN. the best answer here is: Set the intended aggregation bridge priority and inspect root ID.

Enable supported RSTP and verify the correct point-to-point role handling is relevant to the different engineering topic "RSTP rapid transitions", but it is not the most directly supported implementation and troubleshooting step for this precise case: A new access switch unexpectedly wins root election for a shared enterprise VLAN. the best answer here is: Set the intended aggregation bridge priority and inspect root ID.

That option concerns MSTP region consistency. The root bridge establishes the reference point for STP path cost and port-role decisions.

That option concerns BPDU protection for edge ports. The root bridge establishes the reference point for STP path cost and port-role decisions.

That option concerns MPLS end-to-end troubleshooting. The root bridge establishes the reference point for STP path cost and port-role decisions.

Interpret root, designated and alternate port roles relative to the elected bridge is relevant to the different engineering topic "STP root and designated port roles", but it is not the most directly supported technical design or decision for this precise case: A spare switch with a low bridge ID is connected during a maintenance test. the best answer here is: Plan bridge priority so the intended resilient aggregation switch is root for a spanning-tree topology.

Use RSTP's rapid convergence mechanisms for supported point-to-point and edge roles is relevant to the different engineering topic "RSTP rapid transitions", but it is not the most directly supported technical design or decision for this precise case: A spare switch with a low bridge ID is connected during a maintenance test. the best answer here is: Plan bridge priority so the intended resilient aggregation switch is root for a spanning-tree topology.

That option concerns Access port VLAN membership. The root bridge establishes the reference point for STP path cost and port-role decisions.

That option concerns GRE MTU and encapsulation overhead. The root bridge establishes the reference point for STP path cost and port-role decisions.

Investigate BPDU reception and link failure protection before forcing ports forwarding is relevant to the different engineering topic "BPDU visibility on trunks", but it is not the most directly supported implementation and troubleshooting step for this precise case: A spare switch with a low bridge ID is connected during a maintenance test. the best answer here is: Validate root priority controls before allowing production topology changes.

That option concerns Spanning-tree troubleshooting and edge settings. The root bridge establishes the reference point for STP path cost and port-role decisions.

That option concerns VSTP per-VLAN tree behavior. The root bridge establishes the reference point for STP path cost and port-role decisions.

Operational roles permit the intended rapid transition is relevant to the different engineering topic "RSTP rapid transitions", but it is not the most directly supported operational verification evidence for this precise case: A spare switch with a low bridge ID is connected during a maintenance test. the best answer here is: The spare remains a nonroot participant.

That option concerns IPv6 static route next hop. The root bridge establishes the reference point for STP path cost and port-role decisions.