Ports show up/down status for physical layer and line protocol. Common error counters: CRC errors (corruption), collisions, late collisions, giants (oversized frames), and runts (undersized frames). High CRC errors suggest cable problems. Late collisions indicate duplex mismatch. Giants may mean jumbo frame misconfiguration. Check port counters first when troubleshooting connectivity issues.
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$ curl repovive.com/roadmaps/network-design/physical-and-data-link-fundamentals/port-status-and-errors
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