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That option concerns Root protection policy. An IRB interface represents an L3 gateway associated with a VLAN while Layer2 bridging remains within that VLAN.

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: Clients can communicate inside VLAN220 but cannot reach their configured gateway. the best answer here is: Use IRB interfaces when authorized L3 routing is needed between distinct VLAN 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: Clients can communicate inside VLAN220 but cannot reach their configured gateway. the best answer here is: Use IRB interfaces when authorized L3 routing is needed between distinct VLAN broadcast domains.

That option concerns IPv6 neighbor discovery. An IRB interface represents an L3 gateway associated with a VLAN while Layer2 bridging remains within that VLAN.

Check the learning history and topology before disabling the port 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: Clients can communicate inside VLAN220 but cannot reach their configured gateway. the best answer here is: Inspect IRB unit, VLAN association and L3 address.

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: Clients can communicate inside VLAN220 but cannot reach their configured gateway. the best answer here is: Inspect IRB unit, VLAN association and L3 address.

The forwarding entry maps the MAC to the actual active customer handoff 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: Clients can communicate inside VLAN220 but cannot reach their configured gateway. the best answer here is: The IRB responds for its gateway address on the intended VLAN.

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: Clients can communicate inside VLAN220 but cannot reach their configured gateway. the best answer here is: The IRB responds for its gateway address on the intended VLAN.

That option concerns Segment-routing MPLS prefix SIDs. An IRB interface represents an L3 gateway associated with a VLAN while Layer2 bridging remains within that VLAN.

That option concerns STP root and designated port roles. Junos virtual-switch instances provide separate switching contexts and VLAN bridge domains on suitable platforms.

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 metro provider must keep two customer L2 circuits logically separate. the best answer here is: Use a virtual-switch or bridge-domain context to isolate eligible L2 customer switching domains.

Enable permitted 802.1Q VLAN tags on a trunk only for intended tenant broadcast domains is relevant to the different engineering topic "Trunk tagging and VLAN allowlist", but it is not the most directly supported technical design or decision for this precise case: A metro provider must keep two customer L2 circuits logically separate. the best answer here is: Use a virtual-switch or bridge-domain context to isolate eligible L2 customer switching domains.

That option concerns IBGP route propagation constraints. Junos virtual-switch instances provide separate switching contexts and VLAN bridge domains on suitable platforms.

Configure supported VLAN-to-IRB associations and appropriate routes is relevant to the different engineering topic "Integrated routing and bridging", but it is not the most directly supported implementation and troubleshooting step for this precise case: A metro provider must keep two customer L2 circuits logically separate. the best answer here is: Assign interfaces and bridge domains to the intended virtual-switch contexts.

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 metro provider must keep two customer L2 circuits logically separate. the best answer here is: Assign interfaces and bridge domains to the intended virtual-switch contexts.

That option concerns Segment-routing MPLS prefix SIDs. Junos virtual-switch instances provide separate switching contexts and VLAN bridge domains on suitable platforms.

Both allowed VLANs pass while VLAN700 is absent 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: A metro provider must keep two customer L2 circuits logically separate. the best answer here is: MAC learning and flooding remain isolated by customer context.

The VLAN and learned endpoint mapping match the service design is relevant to the different engineering topic "Junos VLAN operational validation", but it is not the most directly supported operational verification evidence for this precise case: A metro provider must keep two customer L2 circuits logically separate. the best answer here is: MAC learning and flooding remain isolated by customer context.

Use IRB interfaces when authorized L3 routing is needed between distinct VLAN broadcast domains is relevant to the different engineering topic "Integrated routing and bridging", but it is not the most directly supported technical design or decision for this precise case: An interface is assigned to the wrong virtual-switch and learns unintended customer MACs. the best answer here is: Use a virtual-switch or bridge-domain context to isolate eligible L2 customer switching domains.

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 interface is assigned to the wrong virtual-switch and learns unintended customer MACs. the best answer here is: Use a virtual-switch or bridge-domain context to isolate eligible L2 customer switching domains.

That option concerns GRES Routing Engine failover. Junos virtual-switch instances provide separate switching contexts and VLAN bridge domains on suitable platforms.

Check both ends for matching VLAN allowlists and tags is relevant to the different engineering topic "Trunk tagging and VLAN allowlist", but it is not the most directly supported implementation and troubleshooting step for this precise case: An interface is assigned to the wrong virtual-switch and learns unintended customer MACs. the best answer here is: Review routing-instance membership and bridge-domain configuration.

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: An interface is assigned to the wrong virtual-switch and learns unintended customer MACs. the best answer here is: Review routing-instance membership and bridge-domain configuration.

That option concerns BGP MED and peer comparison. Junos virtual-switch instances provide separate switching contexts and VLAN bridge domains on suitable platforms.

That option concerns Unknown unicast and flooding. Junos virtual-switch instances provide separate switching contexts and VLAN bridge domains on suitable platforms.

The IRB responds for its gateway address on the intended VLAN is relevant to the different engineering topic "Integrated routing and bridging", but it is not the most directly supported operational verification evidence for this precise case: An interface is assigned to the wrong virtual-switch and learns unintended customer MACs. the best answer here is: The corrected context learns only authorized MAC addresses.

That option concerns OSPF DR/BDR priority election. Junos virtual-switch instances provide separate switching contexts and VLAN bridge domains on suitable platforms.

Understand unknown-destination unicast flooding within a bridge domain until learning occurs is relevant to the different engineering topic "Unknown unicast and flooding", but it is not the most directly supported technical design or decision for this precise case: A tagged customer handoff fails while adjacent VLANs remain healthy. the best answer here is: Inspect VLAN membership and Ethernet-switching MAC tables to confirm layer-2 implementation.

That option concerns BGP best-path selection order. VLAN interface state and learned MAC entries reveal different parts of the access-to-trunk forwarding path.

Assign single-VLAN untagged endpoint traffic to the correct access VLAN on Junos switches is relevant to the different engineering topic "Access port VLAN membership", but it is not the most directly supported technical design or decision for this precise case: A tagged customer handoff fails while adjacent VLANs remain healthy. the best answer here is: Inspect VLAN membership and Ethernet-switching MAC tables to confirm layer-2 implementation.

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.