Kevin Wigle wrote:
> 
> no, the port wouldn't shut down if a promiscuous mode nic was plugged in.

It doesn't matter in what mode nic is working, prom or not. If nic
is not sending traffic, port will stay up.

> but that PC would not be able to send anything

Maybe owner of that PC don't want to send. That PC will be able to sniff
everything, that's the point.

> But consider this....... what info is passed between the switch and the NIC
> so that the Link light goes on?

No MAC packets are exchanged.

> will the switch still learn the MAC even if "real" traffic is not passed?

No.

Regards,
  Sasa
  CCIE 8635




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