Troubleshooting cabling issues (Layer 1 troubleshooting) can sometimes be a very easy process because you can directly see and inspect the cable. However, sometimes cabling problems are invisible, in which case you will have to engage in a systematic troubleshooting process to make sure that the problem is really localized at Layer 1.
Sometimes you simply plug in a cable but get no connection, so you may want to troubleshoot the cable itself. You might run into cases where you plug in the cable and have a connection but there is very low throughput on that connection. You might also . . .
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