I assume that you are talking about Ethernet and FastEthernet devices. Auto-negotiation and auto-sensing features built into Ethernet hubs, switches and NICs can determine if a given link will operated at half or full duplex and 10 or 100 Mbps. To learn more, read this primer: http://inetd.com/CriticalNetworks/resources/speeduplex.htmlhttp://inetd.com/CriticalNetworks/resources/speeduplex.html.
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