check layer 1

networkingIT support

The first commandment of troubleshooting: before anything clever, confirm the cable, the port, the power.

The OSI model doubles as a debugging ladder, and an embarrassing share of 'routing problems' end at an unplugged patch lead or a dead SFP. Start at the bottom; the physical layer has no sense of humor.

Also known as: layer 1 problem, is it plugged in

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