For example, in Figure 1 PC-A’s Ethernet NIC can operate in full-duplex or half-duplex, and in 10 Mb/s or 100 Mb/s. PC-A is connected to switch S1 on port 1, which can operate in full-duplex or half-duplex, and in 10 Mb/s, 100 Mb/s or 1000 Mb/s (1 Gb/s). If both devices are using autonegotiation, the operating mode will be full-duplex and 100 Mb/s.