10/100

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10/100 refers to Ethernet adapters or switch ports that supports two different speeds of Ethernet on the same port. The two speed supported are 10BASE-T, 100BASE-TX. When the link is established the correct speed is selected using autonegotiation to set the speed and duplex for the best values supported by both connected devices. If auto-negotiation fails, a multiple speed device will sense the speed used by its partner, but will assume half-duplex. ^[1]