What is commonly found in a network interface card that indicates activity?

In a network interface card (NIC), an LED indicator is commonly included to signal activity. This LED lights up to show data transmission or reception, providing visual feedback on the operational status of the network connection. When the NIC is active, the LED typically blinks, indicating that data packets are being sent or received over the network. This functionality helps users and technicians quickly diagnose whether the NIC is working correctly or if there are connectivity issues.

The other components mentioned do not serve the same purpose. A fan is used for cooling but does not provide information regarding data activity. A port is simply the physical connection point where the network cable plugs in and does not indicate activity itself. A chipset is a component that manages data transfer but does not have a direct indicator for network activity.