Episode 100 — Link problems: link down, negotiation failures, can’t ping server reasoning

Link-layer problems are on Linux+ because they are the first gate in network troubleshooting, and failures here can masquerade as routing, DNS, or application issues if you skip the basics. This episode explains link down conditions and negotiation failures as issues where the physical or data-link connection is not establishing a stable, expected state. You’ll learn what exam prompts often provide: interface status indicators, error counters, duplex or speed mismatches, and symptoms like intermittent connectivity that tracks with cable or port issues. The core skill is “can’t ping server…