Final answer:
In a FastEthernet connection, a PC transmits data on pins 1 and 2, which is the standard for Ethernet wiring schemes T568A and T568B.
Step-by-step explanation:
In a FastEthernet connection, a PC transmits data on pins 1 and 2. FastEthernet refers to Ethernet connections that have a data transfer rate of 100 Mbps. The connection uses twisted pair cabling, and the standard layout for these cables is known as the T568A or T568B wiring schemes. In both of these schemes, pins 1 and 2 are used for transmitting data while pins 3 and 6 are used for receiving data. This is specified by the Ethernet standards along with crossover cable configurations where the receiving and transmitting pins are switched to allow for direct device-to-device communication without a switch or hub.