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Port-security aging affects learned MAC retention but cannot detect an attacker who successfully imitates an already permitted source address.

A larger permitted set may weaken enforcement and does not validate an endpoint’s identity cryptographically.

Basic port security primarily checks learned/configured MAC values, which can be imitated.

Inventory is useful for hardware fault isolation but does not directly answer which OSPF interface parameters were configured.

Route absence is a downstream symptom; show ip ospf interface directly reports the affected interface’s protocol settings and state.

Neighbor state reveals a symptom but not necessarily the interface settings that caused the OSPF relationship to fail.

IPv4-specific displays do not replace IPv6 route/interface verification for 128-bit destinations.

A Layer 2 CAM view cannot identify all IPv6 destination prefixes and routed next hops.

A healthy local interface and IPv6 address do not prove a route exists to a different /64 prefix; inspect both interface and route information.

STP recalculates topology on failure; an alternate can become eligible if it yields a loop-free path.

PortFast on an interswitch redundant path can create a loop; STP should transition an alternate only after safe topology reconvergence.

A discarding/blocked alternate does not forward normal user traffic until appropriate transition conditions are met.

Reversing range endpoints creates an invalid or unintended pool specification.

The translated public pool must contain the allocated global addresses, not unrelated private hosts.

The pool length does not determine the network mask; /16 conflicts with the specified /24 context.

A UI label does not replace checking the actual API result and device/applied configuration evidence.

Application APIs can return a successful transport response while a job later fails policy validation or deployment.

For asynchronous operations, task identifiers and completion status can be necessary to establish whether a change was applied.

Private address classification does not supply a reachable next-hop adjacency.

Static route recursion does not turn an unknown unicast next hop into multicast forwarding.

AD only affects source preference; the router still needs a valid path to the specified next-hop IP.

ACL placement must match real packet flow; simply moving it to an unrelated link can miss or misclassify guest traffic.

Changing match addresses cannot cure a direction mismatch on the intended source-facing interface, and can create new policy errors.

Logging volume is not proof of correct direction or flow matches; inspect the ingress binding and packet counters.

A wider mask could appear to join the addresses locally but changes the approved subnet boundaries and can create gateway and overlap problems.

In .0/25 broadcast is .127; .140 is a usable address in the different .128/25 network.

ARP maps an on-link IPv4 neighbor to a MAC, but host routing still treats the peer in the other /25 as off-link; Layer 3 forwarding is required.

Without the access VLAN 20 setting, the untagged data host may land in the wrong broadcast domain even if the phone tags voice.

Then untagged PC frames join the voice segment, defeating the intended data VLAN 20 assignment.

A trunk might carry tagged traffic from capable endpoints, but the stated phone-plus-untagged-PC pattern expects a data access VLAN and tagged voice VLAN.

Protocol settings should be consistent; an incompatible type can cause adjacency or topology interpretation problems.

Broadcast OSPF normally performs a DR/BDR election on eligible multiaccess links; point-to-point configuration matches the no-election requirement.

Area mismatch can prevent neighbor formation; area separation is not how to suppress DR election.