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Connected reachability is tied to a live interface, rather than being a static committed route independent of state.

OSPF could learn an alternative route from elsewhere, but it cannot reinstate a connected route tied to an operationally down interface.

The routing table does not create summary networks when a physical interface goes down.

A route selects the next hop, but RFC1918 source addresses still need an acceptable translation or an explicit private transport arrangement.

A single static mapping helps one endpoint; sharing one public address across the entire LAN generally requires overload port tracking.

AAA authenticates principals and actions; NAT/PAT is the function that actually translates private IPv4 traffic.

Root bridge priority does not administratively shut links or independently control unrelated VLAN instances.

Spanning-tree root and first-hop redundancy gateway elections are different protocols and require separate configuration.

A spanning-tree instance maintains one elected root for topology calculation; a secondary designation is a backup preference.

The FIB reflects selected routing decisions; it does not independently discover reachability.

LSAs are control-plane messages and are not rebuilt for each data packet.

Forwarding hardware/data-plane logic typically performs the per-packet rewrite, not the topology protocol itself.

Ownership of MIB state does not determine the requester; the switch’s agent responds to the NMS manager.

SNMP has management roles and does not establish routing-protocol adjacencies.

The manager is the monitoring application endpoint and can be remotely hosted with appropriate connectivity and permissions.

A line password can authenticate access generically, but it does not meet the requirement for administrator-specific local user authentication.

Obfuscation of stored line passwords does not create the requested per-administrator local account authentication.

A default gateway is a forwarding setting; it does not authenticate console users.

The VNI identifies overlay segments, not a mechanism to repair missing physical IP routes.

Overlay tunnels depend on the underlay to deliver encapsulated frames; suppressing routing worsens reachability.

Valid overlay identifiers cannot deliver the encapsulated packet when its outer IP destination is unreachable through the physical fabric.

Without the discard fallback, a router may send traffic for nonexistent subnets toward a less-specific route, creating persistent forwarding loops.

Null0 is a discard interface, not an upstream forwarding next hop.

An equal-length alternative does not guarantee safe disposal of nonexistent destinations and can redirect blackholed traffic into a routing loop.

A /28 has 16 total addresses and 14 typical usable IPv4 host addresses; eight is not the subnet count.

Each extra subnet bit doubles the available subnet combinations. Splitting a /24 into /28 adds four subnet bits, yielding two to the fourth power, or sixteen /28 networks.

A /28 reduces host bits compared with /24. The available eight host bits split into four subnet and four host bits.

VLAN IDs are not IPv4 addresses and cannot be set to a dotted-quad host subnet.

A secondary SVI network could create unintended subnet overlap and masks the fact that the endpoint should use the planned VLAN 70 prefix.

A trunk changes Layer 2 tagging expectations, not the workstation’s IPv4 network/gateway mismatch in the intended VLAN.

An up routed interface can still have inbound ACL denies; per-entry show access-lists hit counters supply the relevant filtering evidence.

Uptime can establish restart history but does not show whether a specific HTTPS deny ACE matched.

A description records operational labeling but not ACL decision counts.