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That option concerns IS-IS IPv6 reachability. Q-in-Q adds a provider S-VLAN tag while retaining the customer's inner C-VLAN tag.

That option concerns Unknown unicast and flooding. Q-in-Q adds a provider S-VLAN tag while retaining the customer's inner C-VLAN tag.

That option concerns Native VLAN and untagged trunk behavior. Q-in-Q adds a provider S-VLAN tag while retaining the customer's inner C-VLAN tag.

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 provider interconnect needs to map customer VLAN120 to VLAN520 on egress. the best answer here is: Choose VLAN tag translation when the service needs intentional replacement of an 802.1Q tag.

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 provider interconnect needs to map customer VLAN120 to VLAN520 on egress. the best answer here is: Choose VLAN tag translation when the service needs intentional replacement of an 802.1Q tag.

That option concerns GRE underlay route recursion. VLAN translation rewrites a tag rather than stacking an additional outer tag as Q-in-Q does.

Assign interfaces and bridge domains to the intended virtual-switch contexts is relevant to the different engineering topic "Virtual-switch routing instance", but it is not the most directly supported implementation and troubleshooting step for this precise case: A provider interconnect needs to map customer VLAN120 to VLAN520 on egress. the best answer here is: Configure an approved VLAN tag mapping without changing unrelated services.

That option concerns IPv6 static route next hop. VLAN translation rewrites a tag rather than stacking an additional outer tag as Q-in-Q does.

That option concerns Unknown unicast and flooding. VLAN translation rewrites a tag rather than stacking an additional outer tag as Q-in-Q does.

That option concerns IPv6 link-local next-hop scope. VLAN translation rewrites a tag rather than stacking an additional outer tag as Q-in-Q does.

Frames arrive in the intended bridge domain without a VLAN tag from the host is relevant to the different engineering topic "Access port VLAN membership", but it is not the most directly supported operational verification evidence for this precise case: A provider interconnect needs to map customer VLAN120 to VLAN520 on egress. the best answer here is: Traffic exits using the translated tag required by the remote segment.

Devices reach the IRB gateway and authorized inter-VLAN destinations 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: A provider interconnect needs to map customer VLAN120 to VLAN520 on egress. the best answer here is: Traffic exits using the translated tag required by the remote segment.

That option concerns GRE protocol and security limitations. VLAN translation rewrites a tag rather than stacking an additional outer tag as Q-in-Q does.

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 customer sees unexpected double-tagged frames from what should be a simple translation. the best answer here is: Choose VLAN tag translation when the service needs intentional replacement of an 802.1Q tag.

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: A customer sees unexpected double-tagged frames from what should be a simple translation. the best answer here is: Choose VLAN tag translation when the service needs intentional replacement of an 802.1Q tag.

Review routing-instance membership and bridge-domain configuration is relevant to the different engineering topic "Virtual-switch routing instance", but it is not the most directly supported implementation and troubleshooting step for this precise case: A customer sees unexpected double-tagged frames from what should be a simple translation. the best answer here is: Inspect whether the interface uses a swap or push operation.

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 customer sees unexpected double-tagged frames from what should be a simple translation. the best answer here is: Inspect whether the interface uses a swap or push operation.

That option concerns Graceful restart helper coordination. VLAN translation rewrites a tag rather than stacking an additional outer tag as Q-in-Q does.

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: A customer sees unexpected double-tagged frames from what should be a simple translation. the best answer here is: Only the intended tag replacement is applied.

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: A customer sees unexpected double-tagged frames from what should be a simple translation. the best answer here is: Only the intended tag replacement is applied.

That option concerns BGP local preference selection. VLAN translation rewrites a tag rather than stacking an additional outer tag as Q-in-Q does.

That option concerns BGP local preference selection. 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: A provider switch must route between an internal operations VLAN and a monitoring VLAN. the best answer here is: Use IRB interfaces when authorized L3 routing is needed between distinct VLAN broadcast 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 provider switch must route between an internal operations VLAN and a monitoring VLAN. the best answer here is: Use IRB interfaces when authorized L3 routing is needed between distinct VLAN broadcast domains.

Set trunk membership to approved VLANs and verify tag handling 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: A provider switch must route between an internal operations VLAN and a monitoring VLAN. the best answer here is: Configure supported VLAN-to-IRB associations and appropriate routes.

That option concerns BGP peer-group policy inheritance. An IRB interface represents an L3 gateway associated with a VLAN while Layer2 bridging remains within that VLAN.

Verify VLAN membership and source-learning behavior for the endpoint is relevant to the different engineering topic "Unknown unicast and flooding", but it is not the most directly supported implementation and troubleshooting step for this precise case: A provider switch must route between an internal operations VLAN and a monitoring VLAN. the best answer here is: Configure supported VLAN-to-IRB associations and appropriate routes.

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 provider switch must route between an internal operations VLAN and a monitoring VLAN. the best answer here is: Devices reach the IRB gateway and authorized inter-VLAN destinations.

That option concerns Native VLAN and untagged trunk behavior. An IRB interface represents an L3 gateway associated with a VLAN while Layer2 bridging remains within that VLAN.

That option concerns IPv6 link-local next-hop scope. An IRB interface represents an L3 gateway associated with a VLAN while Layer2 bridging remains within that VLAN.

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.