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Finding the added loop and restoring spanning-tree protection would not set controlled root priorities and appropriate BPDU guard/root guard. Root guard prevents unauthorized switches becoming topology root.

Expanding the subnet scope or reclaim expired reservations after planning would not set controlled root priorities and appropriate BPDU guard/root guard.

Correcting access VLAN membership to VLAN 30 would not set controlled root priorities and appropriate BPDU guard/root guard. Root guard prevents unauthorized switches becoming topology root.

DHCP assigns client network parameters through a supported lease exchange. That check cannot demonstrate attach an authorized simulated superior-BPDU device at edge and inspect protection.

Remove loop path and observe stable STP topology and broadcast rate. That check cannot demonstrate attach an authorized simulated superior-BPDU device at edge and inspect protection.

Correct answers and service connection validate DNS repair. That check cannot demonstrate attach an authorized simulated superior-BPDU device at edge and inspect protection.

An uncontrolled Layer 2 loop produces repeated frames. That does not establish root election is not protected from inferior edge equipment.

Communication between different IP subnets requires a routed interface or gateway rather than Layer 2 bridging alone. The missing change involves root election is not protected from inferior edge equipment.

Ethernet switching learns source MAC addresses from admitted frames on a forwarding VLAN port. That does not establish root election is not protected from inferior edge equipment.

Setting the accurate subnet mask and routing off-subnet traffic through the gateway would not correct static routes or routing advertisements that form the loop.

Adding correctly scoped reverse-direction TCP return rules would not correct static routes or routing advertisements that form the loop. IP TTL decrements until loops expire rather than delivering traffic.

Correcting the DHCP router option to the actual local gateway would not correct static routes or routing advertisements that form the loop. IP TTL decrements until loops expire rather than delivering traffic.

Packets sent to gateway validate mask repair. Verification of this result involves repeat traceroute and inspect unidirectional next hops.

TCP connections require an accepted SYN, SYN-ACK and ACK exchange before application requests. Verification of this result involves repeat traceroute and inspect unidirectional next hops.

Communication between different IP subnets requires a routed interface or gateway rather than Layer 2 bridging alone. Verification of this result involves repeat traceroute and inspect unidirectional next hops.

The oversized mask causes an incorrect on-link decision. That does not establish an authorized inter-subnet routed path.

One IP cannot reliably identify two simultaneous hosts. That does not establish an authorized inter-subnet routed path.

IP routing depends on a route to the destination prefix and a reachable next hop. The missing change involves the two routers' forwarding entries point at each other.

Correcting access VLAN membership to VLAN 30 would not permit VLAN 90 on approved trunk ports with consistent tagging.

Finding the added loop and restoring spanning-tree protection would not permit VLAN 90 on approved trunk ports with consistent tagging.

Adding the correct IP helper to forward DHCP requests to the server would not permit VLAN 90 on approved trunk ports with consistent tagging.

Remove loop path and observe stable STP topology and broadcast rate. That check cannot demonstrate correct switch VLAN and trunk classification.

DHCP assigns client network parameters through a supported lease exchange. Verification of this result involves inspecting VLAN 90 frames and test end-host Layer 2 reachability.

VLAN membership and 802.1Q tagging determine which Layer 2 broadcast domain carries each frame. Verification of this result involves inspecting VLAN 90 frames and test end-host Layer 2 reachability. The observed condition is a network team addresses this situation: VLAN 90 works on each side of a campus link but hosts cannot communicate across it and the trunk allowed list lacks 90..

An uncontrolled Layer 2 loop produces repeated frames. That does not establish correct switch VLAN and trunk classification.

Ethernet switching learns source MAC addresses from admitted frames on a forwarding VLAN port. That does not establish correct switch VLAN and trunk classification.

Communication between different IP subnets requires a routed interface or gateway rather than Layer 2 bridging alone. The missing change involves the trunk drops traffic for a missing allowed VLAN.

Applying supported QoS queueing and validating buffering for real-time traffic would not prioritize latency-sensitive flows and manage capacity or scheduled bulk transfers.

Repairing fiber loss or select compatible reach optics with adequate margin would not prioritize latency-sensitive flows and manage capacity or scheduled bulk transfers.

Selecting latency-tolerant applications or lower-latency transport where required would not prioritize latency-sensitive flows and manage capacity or scheduled bulk transfers.

Measure RTP interarrival jitter and call quality under load. That check cannot demonstrate the current HTTP endpoint and expected application response.

Optical transceiver compatibility and receive-light measurements diagnose the physical signal path before higher-layer work. That check cannot demonstrate the current HTTP endpoint and expected application response.

Compare RTT on the satellite and a terrestrial backup link. That check cannot demonstrate the current HTTP endpoint and expected application response.