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Onboard and add-on Network Interface Cards (NICs) perform the same fundamental function, which is to enable a device to connect to a network and communicate with other devices. Both types of NICs facilitate data transmission over a network and allow for internet connectivity.
Onboard NICs are integrated directly into the motherboard of a computer, meaning they are built-in and rely on the motherboard's capabilities for functionality. In contrast, add-on NICs are separate cards that can be installed in expansion slots on the motherboard, providing users the option to enhance or upgrade networking capabilities as needed.
Although they may differ in terms of installation and potential upgrade options, both types operate under similar principles and serve the same purpose when it comes to networking. Therefore, the option stating that they both function the same captures the essence of their roles accurately.