In a FastEthernet connection, which pins does a router use to transmit data?

In a FastEthernet connection, the correct pins used for transmitting data are 1 and 2. This corresponds to the standard wiring for Ethernet connections, specifically for 10BaseT and 100BaseT, which utilize the same pin configuration. In these standards, pins 1 and 2 on an RJ-45 connector are designated for transmitting data from the device. These pins are responsible for sending signals when transmitting data packets over the network.

Additionally, it is essential to understand the role of other pin pairs in Ethernet connections. For example, pins 3 and 6 are used for receiving data and pins 4, 5, 7, and 8 may be utilized in specific situations such as in 1000Base-T (Gigabit Ethernet), which can use all four pairs for data transmission. However, in the context of standard FastEthernet, pins 1 and 2 are specifically designated for transmission, making them the correct answer in this scenario.