CCNA Discovery 1, Chapter 9
9.2.1: You will likely identify some serious switch hardware problems with your senses. Hot, loud, lightless switches can indicate problems with your switch hardware. Check for a malfunctioning fan, possible overheating, and faulty power or network connections.
9.3.1–9.3.3: The following test can help you isolate issues on a switched network:
• Look at LED indicators on your networking devices. LEDs can show network or processing activity, power, and the status of a device. An inactive LED can indicate power or hardware failure as well as an improper configuration for a port or connection.
• To check connectivity issues, you should ping your default gateway to ensure connectivity between your host and the router. You ...
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