Why Are Some Fastethernet Ports On The Switches Are Up And Down?
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The FastEthernet ports on switches can be up or down for a variety of reasons. These include:
-Link errors due to a bad cable, faulty port, or the port being set to a different speed or duplex than the rest of the switch
-Misconfigured VLANs on the port
-The port being disabled
-The port being connected to a device that is not responding
-Incorrect mtu configuration causing the link to fail
-The port being connected to a device that is not compatible with the switch