Speed & Duplex on NIC - Auto Negotiation setting - how does it detrmine speed?

fuzzyfreak
fuzzyfreak used Ask the Experts™
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I just wondered why my server NIC, which is set to auto negotiate speed, is running at 100mbps.  Though the NIC is capable of 1Gbps, my switches are 100mbps - is this why the auto negotiation will set my NIC speed to 100mbps?
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Simply answered: Yes

Less simply answered: Auto-negotiation works like this:

http://en.wikipedia.org/wiki/Autonegotiation#Electrical_signals

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Thanks!

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