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FHRP failover preserves the virtual gateway identity; a failed router’s individual interface IP does not migrate between devices.

Changing the virtual gateway address defeats the intended stable first-hop endpoint and can strand clients until reconfigured.

Reconfiguring every host's IP gateway would negate the purpose of a virtual first hop. The group keeps the gateway IP stable during active-router failover.

Link-local addresses begin with fe80::/10 and are confined to one link for discovery and local communication. The supplied fd address has a different scope.

The public global unicast category commonly uses 2000::/3. The fd prefix belongs to unique-local space, even if an organization routes that address internally.

Multicast starts with ff00::/8 and targets groups of receivers. The supplied fd address identifies unicast unique-local space, not a multicast group.

HTTPS management should protect the actual privileged session, not merely read-only telemetry while configuration remains exposed.

Changing the TCP port number does not encrypt HTTP. Credentials and settings remain vulnerable to interception on the path and the port is readily discoverable.

HTTP has no TLS certificate for the browser to validate. Ignoring warnings does not add confidentiality and may encourage a false belief that the management session is secure.

Router ID can influence tie breaking in DR election, but it does not override network mask compatibility. A larger ID cannot repair an incorrectly addressed shared segment.

A static route may provide reachability through another path but does not correct the OSPF Hello parameters on the shared Ethernet link. Fix the connected addressing.

Reference bandwidth controls interface cost calculations. A mask mismatch remains even if calculated costs are changed, so this would not establish normal neighbor formation.

SNMP can alter or query device objects but is not generally the simple whole-file backup transport requested.

TFTP has low operational overhead but does not protect credentials or file contents; the scenario’s trust assumptions matter.

Secure copy is defensible for sensitive links, but the stated choice weighs low overhead on a trusted isolated lab against additional encrypted-transfer setup.

Broad standard ACLs on unrelated LAN interfaces can interrupt legitimate users and cannot express all extended traffic conditions. The known error is incorrect direction on the external interface.

ACL sequence numbers affect entry order, not the direction in which a whole list is evaluated. The inbound traffic bypasses a WAN outbound-only filter.

ACL address matching requires the intended wildcard or equivalent syntax; removing it does not create stateful TCP inspection. An explicit ingress policy is needed.

Overlay encapsulation still depends on the routed transport fabric; a VNI alone cannot carry packets between unreachable VTEPs.

Virtual tunnel endpoints require packets to traverse real links, so an overlay cannot eliminate the underlay or its routing reachability. A broken transport still breaks the virtual service.

Fabric describes the coordinated network architecture and forwarding environment, not a credential. Authentication is a separate management control rather than the packet topology itself.

A higher administrative distance makes a route less preferred, not more preferred. It is an intentional way to keep a backup dormant under normal operation.

Cisco IOS allows manually configured IPv4 default routes. Dynamic routing is optional; a correct static next hop can install whenever its route is preferred and reachable.

Different static-route distances define a preferred primary and floating backup, not automatic equal-path sharing.

A /30 provides four total addresses and two ordinary usable host addresses. It fits a classic point-to-point pair, not the requested shared device VLAN.

A /27 would work technically with thirty usable hosts but is not the smallest subnet meeting twelve assignments. The request emphasizes minimizing wasted address space.

A /29 provides eight total addresses, six ordinary usable hosts, so it cannot accommodate eleven readers and the gateway. Increasing address assignments cannot change that capacity.

VTP distributes or manages VLAN databases in supported modes; a domain-name change cannot make different native VLAN IDs represent the same untagged traffic safely.

The allowed VLAN list controls which VLANs can traverse a trunk and may help tagged VLANs, but it does not resolve differing native VLAN identifiers for untagged frames.

The current mismatch concerns inconsistent untagged frame handling, not an STP root issue; align the native VLAN deliberately.

A local username/secret must be referenced by login local; a shared line password does not satisfy per-user local login policy.

The simple `login` setting can use a configured line password rather than the local username database. Removing the user definition defeats the requested account-based sign-in.

The enable secret protects privileged mode after a login succeeds. It does not determine how VTY access authenticates the incoming user's name and password.