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Stateful firewalls can distinguish permitted connection initiation from return traffic. It does not examine TTL and validation-related response fields.

Different answers identify stale or incorrect resolution. It does not examine TTL and validation-related response fields.

DHCP assigns client network parameters through a supported lease exchange. It does not examine TTL and validation-related response fields.

Inspecting LLDP or CDP neighbor information on the managed interface would not meet the need for tcpdump or equivalent packet capture on the relevant interface.

Running a tightly scoped authorized Nmap TCP scan would not meet the need for tcpdump or equivalent packet capture on the relevant interface.

Inspecting sockets with ss or netstat to confirm the intended listener would not meet the need for tcpdump or equivalent packet capture on the relevant interface.

Neighbor and physical map consistency validate adjacency. That check cannot demonstrate completion of the TCP three-way handshake.

Compare bound port output before and after starting the service. That check cannot demonstrate completion of the TCP three-way handshake.

Stateful firewalls can distinguish permitted connection initiation from return traffic. That check cannot demonstrate completion of the TCP three-way handshake.

Discovery advertisements reveal directly adjacent device and port identifiers. That does not establish packet-level timing is not visible in basic connection logs.

Port scans enumerate reachable listeners but do not prove vulnerabilities. The missing change involves packet-level timing is not visible in basic connection logs.

A service not listening cannot accept a transport handshake. That does not establish packet-level timing is not visible in basic connection logs.

Running a tightly scoped authorized Nmap TCP scan would not inspect sockets with ss or netstat to confirm the intended listener. A service not listening cannot accept a transport handshake.

Using tcpdump or equivalent packet capture on the relevant interface would not inspect sockets with ss or netstat to confirm the intended listener. A service not listening cannot accept a transport handshake.

Using ping with expected ICMP filtering caveats to test echo reachability would not inspect sockets with ss or netstat to confirm the intended listener. A service not listening cannot accept a transport handshake.

Directional packet evidence isolates the failing leg. It does not compare bound port output before and after starting the service.

Compare wiremap and crosstalk readings with cable category limits. It does not compare bound port output before and after starting the service.

VLAN membership and 802.1Q tagging determine which Layer 2 broadcast domain carries each frame. It does not compare bound port output before and after starting the service.

Basic IP connectivity has not been tested. That does not establish local socket listening state is unknown.

Packet-level timing is not visible in basic connection logs. That does not establish local socket listening state is unknown.

Continuity alone misses some pair construction defects. That does not establish local socket listening state is unknown.

Inspecting ARP neighbor entries and investigating conflicting IP-MAC associations would not run ipconfig /all and inspect the complete adapter configuration.

Using ping with expected ICMP filtering caveats to test echo reachability would not run ipconfig /all and inspect the complete adapter configuration.

Using tcpdump or equivalent packet capture on the relevant interface would not run ipconfig /all and inspect the complete adapter configuration.

Communication between different IP subnets requires a routed interface or gateway rather than Layer 2 bridging alone. Verification of this result involves comparing reported lease parameters with the intended subnet and DHCP scope.

Run ip route get for a remote address after correction. That check cannot demonstrate successful client IP addressing from the correct scope.

Directional packet evidence isolates the failing leg. That check cannot demonstrate successful client IP addressing from the correct scope.

A forwarded frame uses the local next-hop MAC even when its encapsulated IP destination stays constant. That does not establish local interface IP configuration is not documented.

Discovery advertisements reveal directly adjacent device and port identifiers. That does not establish local interface IP configuration is not documented.

Packet-level timing is not visible in basic connection logs. That does not establish local interface IP configuration is not documented.

Querying affected names using nslookup against specific recursive and authoritative servers would not inspect and correct routes using ip route commands.

Running ipconfig /all and inspecting the complete adapter configuration would not inspect and correct routes using ip route commands.

Inspecting ARP neighbor entries and investigating conflicting IP-MAC associations would not inspect and correct routes using ip route commands.