The ports (the interfaces) do not have an IP address, since they are layer 2. The ports are configured for auto-negotiation with Fast and Gigabit Ethernet. The switch senses the attached devices modes – if a device does not support auto-negotiation, then the switch sets that port to half-duplex by default.
There are four modes :
Auto – default for 100 Mbps ports – includes autonegotiation
Full – full duplex
Full Flow-Control - full duplexs with flow control
Half – half duplex – default for 10 Mbps ports