Which pins does a switch use to transmit data in a FastEthernet connection?

In a FastEthernet connection using an unshielded twisted pair (UTP) cable, the specific pairs of pins used for transmitting data are crucial for network communication. FastEthernet operates at 100 Mbps and uses two pairs of wires within the eight-wire cable.

For data transmission in a FastEthernet setup, pins 1 and 2 are used for transmitting data, while pins 3 and 6 are used for receiving data. This allows the device to send and receive information effectively.

The correct choice is based on the fact that for FastEthernet, it significantly depends on the wiring standard being employed (T568A or T568B). However, pins 1 and 2 are universally recognized for transmitting data as part of the differential signaling used in this standard.

This understanding of the pin configurations is essential for ensuring that switches and other networking devices can communicate effectively. In contrast, options that refer to other pins or pairings do not align with the standard configurations for FastEthernet data transmission, as they relate to either receiving data or are not utilized for the purposes defined in 100Base-TX Ethernet specifications.