A Cisco Catalyst switch supports three duplex settings:The full option sets full-duplex mode.The half option sets half-duplex mode. The auto option sets autonegotiation of duplex mode which enables two ports to decide the best mode of operation.For Fast Ethernet and 10/100/1000 ports, the default is auto. For 100BASE-FX ports, the default is full. The 10/100/1000 ports operate in either half- or full-duplex mode when they are set to 10 or 100 Mb/s, but when set to 1,000 Mb/s, they operate only in full-duplex mode.
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