This is a CCNA question, the title pretty much says it all. What would happen if I connected a device with the wrong type of cable? Could the cable damage the device in some way?
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Assuming we're talking about Ethernet connecting to Ethernet, without PoE (power over Ethernet) then no, connecting an Ethernet cable will not harm either device.
Connecting Ethernet to a modem port may harm one of the devices, but I forget which one. Connecting Ethernet with PoE to a device with the incorrect cable MAY harm the device NOT supplying power. There are likely several other combinations which could cause harm to either or both sides.
kronenpj
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