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Directional packet evidence isolates the failing leg. It does not compare peer-reported port ID with physical cable tracing.

Physical break identification validates the tool choice. It does not compare peer-reported port ID with physical cable tracing.

Communication between different IP subnets requires a routed interface or gateway rather than Layer 2 bridging alone. Verification of this result involves comparing peer-reported port ID with physical cable tracing.

Optical transceiver compatibility and receive-light measurements diagnose the physical signal path before higher-layer work. That does not establish link-layer neighbor identity is unknown.

Packet-level timing is not visible in basic connection logs. That does not establish link-layer neighbor identity is unknown.

Local interface IP configuration is not documented. That does not establish link-layer neighbor identity is unknown.

Using a visual fault locator within its supported safety limits to trace or identify the break would not meet the need for a proper cable certifier to inspect wiremap, pair integrity and NEXT.

Using ping with expected ICMP filtering caveats to test echo reachability would not meet the need for a proper cable certifier to inspect wiremap, pair integrity and NEXT.

Using tcpdump or equivalent packet capture on the relevant interface would not meet the need for a proper cable certifier to inspect wiremap, pair integrity and NEXT.

Physical break identification validates the tool choice. It does not compare wiremap and crosstalk readings with cable category limits.

Run ip route get for a remote address after correction. It does not compare wiremap and crosstalk readings with cable category limits.

Directional packet evidence isolates the failing leg. It does not compare wiremap and crosstalk readings with cable category limits.

Optical transceiver compatibility and receive-light measurements diagnose the physical signal path before higher-layer work. That does not establish copper wiring arrangement is not certified.

IP routing depends on a route to the destination prefix and a reachable next hop. That does not establish copper wiring arrangement is not certified.

DNS resolution maps hostnames to records and can fail independently of packet forwarding. That does not establish copper wiring arrangement is not certified.

Inspecting LLDP or CDP neighbor information on the managed interface would not meet the need for a visual fault locator within its supported safety limits to trace or identify the break.

Using a proper cable certifier to inspect wiremap, pair integrity and NEXT would not meet the need for a visual fault locator within its supported safety limits to trace or identify the break.

Using ping with expected ICMP filtering caveats to test echo reachability would not meet the need for a visual fault locator within its supported safety limits to trace or identify the break.

Neighbor and physical map consistency validate adjacency. That check cannot demonstrate restoration and verification of received optical light.

Compare wiremap and crosstalk readings with cable category limits. That check cannot demonstrate restoration and verification of received optical light.

VLAN membership and 802.1Q tagging determine which Layer 2 broadcast domain carries each frame. That check cannot demonstrate restoration and verification of received optical light.

Discovery advertisements reveal directly adjacent device and port identifiers. That does not establish restoration and verification of received optical light.

Continuity alone misses some pair construction defects. That does not establish restoration and verification of received optical light.

Basic IP connectivity has not been tested. That does not establish restoration and verification of received optical light.

Running traceroute or tracert and interpreting TTL-expiry responses would not meet the need for a Wi-Fi analyzer and, for non-Wi-Fi emitters, a spectrum analyzer.

Querying affected names using nslookup against specific recursive and authoritative servers would not meet the need for a Wi-Fi analyzer and, for non-Wi-Fi emitters, a spectrum analyzer.

Inspecting LLDP or CDP neighbor information on the managed interface would not meet the need for a Wi-Fi analyzer and, for non-Wi-Fi emitters, a spectrum analyzer.

Compare outbound hop progression before and after route repair. It does not compare channel utilization and spectrum before and after RF changes.

Communication between different IP subnets requires a routed interface or gateway rather than Layer 2 bridging alone. Verification of this result involves comparing channel utilization and spectrum before and after RF changes.

Run ip route get for a remote address after correction. It does not compare channel utilization and spectrum before and after RF changes.

A missing WAN default route would interrupt reachability, not selectively raise wireless retries and airtime utilization when nearby APs are active.

An HTTPS session timer can interrupt application sessions but does not explain radio-layer channel occupancy and retransmissions.

DHCP exhaustion causes address-assignment failures; the observed retries and heavy channel usage indicate an RF medium problem.