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Question:

A PC has been set up as a print server that will be accessible 24 hours a day, seven days a week. When not in use, the PC should be turned off to save energy. When a print job is received, what feature of the Network Interface Card allows a powered down or sleeping PC to power on?

A Wake-on-LAN
Explaination

When a PC is set to use Wake-on-LAN, it will turn on when a print job is sent. A similar feature is available for modems, which allows the PC to be powered on when the modem identifies a call. This is Wake-On-Ring, which is frequently used when PCs are set up to receive faxes.