Final answer:
In FastEthernet, a firewall transmits data on pins 1 and 2, and receives data on pins 3 and 6 following the T568A and T568B wiring standards.
Step-by-step explanation:
In a FastEthernet connection, a firewall transmits data on pins 1 and 2, and it receives data on pins 3 and 6. These pin assignments pertain to the T568A and T568B wiring standards which are used in 10BASE-T and 100BASE-TX Ethernet standards. To ensure proper communication across network devices like computers, switches, and routers, it is crucial for the transmit and receive pins to be correctly wired as per the Ethernet specifications.