Quick Reference Guide to Auto-Negotiation
The priorities are listed in the table below in a ranking from the highest to the lowest. The full duplex mode of operation is given higher priority than the original (half duplex) Ethernet, since the full duplex system can send more data than a half duplex link operating at the same speed. Therefore if the devices at both ends of the link can support full duplex operation, and if they also both support Auto-Negotiation of this capability, then they will automatically configure themselves for the higher performance full duplex mode.
The table shows that if both devices on the link can support, for example, 10BASE-T and 100BASE-TX, then the Auto-Negotiation protocol at both ends will connect using the 100BASE-TX mode instead of 10BASE-T.
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