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Inspecting the access VLAN port state and MAC-learning controls rather than changing IP routes would not correct neighbor resolution or next-hop Layer 2 adjacency while retaining the intended IP destination.

Standardizing the negotiated character encoding and serialization format would not correct neighbor resolution or next-hop Layer 2 adjacency while retaining the intended IP destination.

The frame's next-hop destination is wrong even when the inner IP address is correct.

Ethernet switching learns source MAC addresses from admitted frames on a forwarding VLAN port. That check cannot demonstrate correct Layer 2 next-hop resolution for the intended IP route.

A matching route and progressing hops prove Layer 3 forwarding. That check cannot demonstrate correct Layer 2 next-hop resolution for the intended IP route.

Matching decoding proves the presentation translation is consistent. That check cannot demonstrate correct Layer 2 next-hop resolution for the intended IP route.

Both endpoints must agree on character encoding for transmitted bytes to produce readable text. The missing change involves the frame's next-hop destination is wrong even when the inner IP address is correct.

IP routing depends on a route to the destination prefix and a reachable next hop.

The data-link frame path is not being learned or forwarded. The missing change involves the frame's next-hop destination is wrong even when the inner IP address is correct.

Configuring application-relevant health checks and removing failed targets automatically would not provide a router or routed switch interface for each subnet with appropriate policy.

Publishing the application behind a hardened reverse proxy and block direct origin reachability would not provide a router or routed switch interface for each subnet with appropriate policy.

Installing an appropriately managed access switch and connecting it to the existing uplink would not provide a router or routed switch interface for each subnet with appropriate policy.

A load balancer routes requests only to backends that satisfy its configured health checks.

Success through proxy and denial direct to origin validate isolation. That check cannot demonstrate an authorized inter-subnet routed path.

Learning multiple hosts proves the local switching function. That check cannot demonstrate an authorized inter-subnet routed path.

Unprotected origin servers are an inbound reverse-proxy exposure, not a failure of client outbound web filtering.

Unhealthy backends remain eligible for traffic distribution. That does not establish no Layer 3 device forwards between the distinct IP networks.

The office lacks sufficient local Layer 2 access ports. That does not establish no Layer 3 device forwards between the distinct IP networks.

Configuring application-relevant health checks and removing failed targets automatically would not install an appropriately managed access switch and connect it to the existing uplink.

Using a suitably tuned inline intrusion prevention function for the attack path would not install an appropriately managed access switch and connect it to the existing uplink.

Using a NAS file service with appropriate SMB or NFS access controls would not install an appropriately managed access switch and connect it to the existing uplink.

A load balancer routes requests only to backends that satisfy its configured health checks. Verification of this result involves confirming link negotiation and MAC learning for clients on different access ports.

Mount the shared directory from two authorized clients and test permissions. That check cannot demonstrate frame admission and MAC learning on the affected access port.

A blocked test packet proves enforcement, not merely detection. That check cannot demonstrate frame admission and MAC learning on the affected access port.

Unhealthy backends remain eligible for traffic distribution. That does not establish the office lacks sufficient local Layer 2 access ports.

Both endpoints must agree on character encoding for transmitted bytes to produce readable text. That does not establish the office lacks sufficient local Layer 2 access ports.

Passive detection does not interrupt malicious flows. That does not establish the office lacks sufficient local Layer 2 access ports.

Using a NAS file service with appropriate SMB or NFS access controls would not deploy stateful filtering allowing approved inbound sessions and their return traffic.

Configuring application-relevant health checks and removing failed targets automatically would not deploy stateful filtering allowing approved inbound sessions and their return traffic.

Using a suitably tuned inline intrusion prevention function for the attack path would not deploy stateful filtering allowing approved inbound sessions and their return traffic.

Try an approved site and a blocked destination with a test user. That check cannot demonstrate attempt a denied new session and confirm permitted reply packets still pass.

A working Layer 3 path establishes correct routed connectivity. That check cannot demonstrate attempt a denied new session and confirm permitted reply packets still pass.

Mount the shared directory from two authorized clients and test permissions. That check cannot demonstrate attempt a denied new session and confirm permitted reply packets still pass.