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That option concerns Active-route versus hidden-route triage. An access port generally carries one untagged VLAN, unlike a trunk carrying multiple tagged VLANs.

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: An endpoint moves to a new port but cannot reach peers within its service VLAN. the best answer here is: Assign single-VLAN untagged endpoint traffic to the correct access VLAN on Junos switches.

Choose VLAN tag translation when the service needs intentional replacement of an 802.1Q tag is relevant to the different engineering topic "VLAN translation distinction", but it is not the most directly supported technical design or decision for this precise case: An endpoint moves to a new port but cannot reach peers within its service VLAN. the best answer here is: Assign single-VLAN untagged endpoint traffic to the correct access VLAN on Junos switches.

That option concerns Loop protection when BPDUs vanish. An access port generally carries one untagged VLAN, unlike a trunk carrying multiple tagged VLANs.

That option concerns Junos VLAN operational validation. An access port generally carries one untagged VLAN, unlike a trunk carrying multiple tagged VLANs.

Inspect whether the interface uses a swap or push operation 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: An endpoint moves to a new port but cannot reach peers within its service VLAN. the best answer here is: Check access VLAN assignment and port state.

The expected tagged VLAN appears on the port and forwarding resumes is relevant to the different engineering topic "Trunk tagging and VLAN allowlist", but it is not the most directly supported operational verification evidence for this precise case: An endpoint moves to a new port but cannot reach peers within its service VLAN. the best answer here is: The endpoint MAC is learned in the expected VLAN.

That option concerns Unknown unicast and flooding. An access port generally carries one untagged VLAN, unlike a trunk carrying multiple tagged VLANs.

That option concerns LDP-IGP synchronization. An access port generally carries one untagged VLAN, unlike a trunk carrying multiple tagged VLANs.

That option concerns Static-route next-hop resolution. Trunk ports carry multiple allowed VLANs with tagged frames while access ports generally carry one untagged domain.

Inspect VLAN membership and Ethernet-switching MAC tables to confirm layer-2 implementation is relevant to the different engineering topic "Junos VLAN operational validation", but it is not the most directly supported technical design or decision for this precise case: An inter-switch uplink must transport VLANs 210 and 211 but not customer VLAN 700. the best answer here is: Enable permitted 802.1Q VLAN tags on a trunk only for intended tenant broadcast domains.

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: An inter-switch uplink must transport VLANs 210 and 211 but not customer VLAN 700. the best answer here is: Enable permitted 802.1Q VLAN tags on a trunk only for intended tenant broadcast domains.

That option concerns Access port VLAN membership. Trunk ports carry multiple allowed VLANs with tagged frames while access ports generally carry one untagged domain.

Inspect show vlans and show ethernet-switching table with port membership is relevant to the different engineering topic "Junos VLAN operational validation", but it is not the most directly supported implementation and troubleshooting step for this precise case: An inter-switch uplink must transport VLANs 210 and 211 but not customer VLAN 700. the best answer here is: Set trunk membership to approved VLANs and verify tag handling.

That option concerns GRE encapsulation purpose. Trunk ports carry multiple allowed VLANs with tagged frames while access ports generally carry one untagged domain.

Traffic exits using the translated tag required by the remote segment is relevant to the different engineering topic "VLAN translation distinction", but it is not the most directly supported operational verification evidence for this precise case: An inter-switch uplink must transport VLANs 210 and 211 but not customer VLAN 700. the best answer here is: Both allowed VLANs pass while VLAN700 is absent.

The host's source MAC is learned on the correct interface is relevant to the different engineering topic "MAC-address dynamic learning", but it is not the most directly supported operational verification evidence for this precise case: An inter-switch uplink must transport VLANs 210 and 211 but not customer VLAN 700. the best answer here is: Both allowed VLANs pass while VLAN700 is absent.

That option concerns BGP best-path selection order. Trunk ports carry multiple allowed VLANs with tagged frames while access ports generally carry one untagged domain.

Inspect VLAN membership and Ethernet-switching MAC tables to confirm layer-2 implementation is relevant to the different engineering topic "Junos VLAN operational validation", but it is not the most directly supported technical design or decision for this precise case: A customer VLAN stops crossing a newly replaced trunk link. the best answer here is: Enable permitted 802.1Q VLAN tags on a trunk only for intended tenant broadcast domains.

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 customer VLAN stops crossing a newly replaced trunk link. the best answer here is: Enable permitted 802.1Q VLAN tags on a trunk only for intended tenant broadcast domains.

That option concerns IS-IS NET addressing. Trunk ports carry multiple allowed VLANs with tagged frames while access ports generally carry one untagged domain.

That option concerns OSPF hello/dead agreement. Trunk ports carry multiple allowed VLANs with tagged frames while access ports generally carry one untagged domain.

Compare native VLAN configuration on each side is relevant to the different engineering topic "Native VLAN and untagged trunk behavior", but it is not the most directly supported implementation and troubleshooting step for this precise case: A customer VLAN stops crossing a newly replaced trunk link. the best answer here is: Check both ends for matching VLAN allowlists and tags.

Compare VLAN-to-port mapping and underlying physical connectivity is relevant to the different engineering topic "Junos VLAN operational validation", but it is not the most directly supported implementation and troubleshooting step for this precise case: A customer VLAN stops crossing a newly replaced trunk link. the best answer here is: Check both ends for matching VLAN allowlists and tags.

That option concerns IS-IS authentication checks. Trunk ports carry multiple allowed VLANs with tagged frames while access ports generally carry one untagged domain.

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 customer VLAN stops crossing a newly replaced trunk link. the best answer here is: The expected tagged VLAN appears on the port and forwarding resumes.

Only the intended tag replacement is applied is relevant to the different engineering topic "VLAN translation distinction", but it is not the most directly supported operational verification evidence for this precise case: A customer VLAN stops crossing a newly replaced trunk link. the best answer here is: The expected tagged VLAN appears on the port and forwarding resumes.

That option concerns Integrated routing and bridging. On platforms supporting a native VLAN, untagged frames on a trunk can be assigned to a designated VLAN.

That option concerns Network-LSA type-two interpretation. On platforms supporting a native VLAN, untagged frames on a trunk can be assigned to a designated VLAN.

Use a virtual-switch or bridge-domain context to isolate eligible L2 customer switching domains is relevant to the different engineering topic "Virtual-switch routing instance", but it is not the most directly supported technical design or decision for this precise case: A service-management port sends untagged control traffic on a shared trunk. the best answer here is: Treat the trunk native VLAN as a deliberate untagged-frame mapping, not a generic security bypass.

Assign separate provider S-VLANs while retaining each customer inner tag is relevant to the different engineering topic "Provider bridging Q-in-Q", but it is not the most directly supported implementation and troubleshooting step for this precise case: A service-management port sends untagged control traffic on a shared trunk. the best answer here is: Check native VLAN policy on both peers and avoid accidental customer mixing.

Inspect show vlans and show ethernet-switching table with port membership is relevant to the different engineering topic "Junos VLAN operational validation", but it is not the most directly supported implementation and troubleshooting step for this precise case: A service-management port sends untagged control traffic on a shared trunk. the best answer here is: Check native VLAN policy on both peers and avoid accidental customer mixing.

That option concerns VRRP virtual gateway failover. On platforms supporting a native VLAN, untagged frames on a trunk can be assigned to a designated VLAN.