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

Correcting access VLAN membership to VLAN 30 would not set the accurate subnet mask and route off-subnet traffic through the gateway.

Adding correctly scoped reverse-direction TCP return rules would not set the accurate subnet mask and route off-subnet traffic through the gateway.

DHCP assigns client network parameters through a supported lease exchange. Verification of this result involves inspecting ARP and route behavior for remote prefix after correction.

Progress without repeated hop cycle validates route fix.

TCP connections require an accepted SYN, SYN-ACK and ACK exchange before application requests. That check cannot demonstrate a valid Layer 3 route toward the remote subnet.

Communication between different IP subnets requires a routed interface or gateway rather than Layer 2 bridging alone. The missing change involves the oversized mask causes an incorrect on-link decision.

Ethernet switching learns source MAC addresses from admitted frames on a forwarding VLAN port. That does not establish the oversized mask causes an incorrect on-link decision.

IP routing depends on a route to the destination prefix and a reachable next hop. That does not establish the oversized mask causes an incorrect on-link decision.

Adding correctly scoped reverse-direction TCP return rules would not install the appropriate upstream default route with healthy next hop.

Adding the correct IP helper to forward DHCP requests to the server would not install the appropriate upstream default route with healthy next hop.

Excluding the gateway address and clear conflicting leases safely would not install the appropriate upstream default route with healthy next hop.

TCP connections require an accepted SYN, SYN-ACK and ACK exchange before application requests. It does not inspect route lookup to 8.8.8.8 and trace actual forwarded hops.

VLAN membership and 802.1Q tagging determine which Layer 2 broadcast domain carries each frame. It does not inspect route lookup to 8.8.8.8 and trace actual forwarded hops.

DHCP assigns client network parameters through a supported lease exchange. It does not inspect route lookup to 8.8.8.8 and trace actual forwarded hops.

Communication between different IP subnets requires a routed interface or gateway rather than Layer 2 bridging alone. The missing change involves its routing table has no default route.

Return traffic policy lacks matching allow rule. That does not establish its routing table has no default route.

Ethernet switching learns source MAC addresses from admitted frames on a forwarding VLAN port. That does not establish its routing table has no default route.

Installing the appropriate upstream default route with healthy next hop would not add correctly scoped reverse-direction TCP return rules.

Setting the accurate subnet mask and routing off-subnet traffic through the gateway would not add correctly scoped reverse-direction TCP return rules.

Correcting the DHCP router option to the actual local gateway would not add correctly scoped reverse-direction TCP return rules.

Inspect route lookup to 8.8.8.8 and trace actual forwarded hops. That check cannot demonstrate completion of the TCP three-way handshake.

DHCP assigns client network parameters through a supported lease exchange. That check cannot demonstrate completion of the TCP three-way handshake.

Packets sent to gateway validate mask repair. That check cannot demonstrate completion of the TCP three-way handshake.

Its routing table has no default route. That does not establish return traffic policy lacks matching allow rule.

The oversized mask causes an incorrect on-link decision. That does not establish return traffic policy lacks matching allow rule.

Ethernet switching learns source MAC addresses from admitted frames on a forwarding VLAN port. That does not establish return traffic policy lacks matching allow rule.

Expanding the subnet scope or reclaim expired reservations after planning would not update the A record and manage resolver cache TTL during migration.

Adding the correct IP helper to forward DHCP requests to the server would not update the A record and manage resolver cache TTL during migration.

Setting the accurate subnet mask and routing off-subnet traffic through the gateway would not update the A record and manage resolver cache TTL during migration.

Renew multiple new clients and inspect free address count. That check cannot demonstrate query authoritative and recursive records and retest hostname connection.

VLAN membership and 802.1Q tagging determine which Layer 2 broadcast domain carries each frame. That check cannot demonstrate query authoritative and recursive records and retest hostname connection.

DHCP assigns client network parameters through a supported lease exchange. That check cannot demonstrate query authoritative and recursive records and retest hostname connection.