A(n) is the unit of network information nics and switches work with.

Network card

Explanation:

 A network card is unit of the network information NIC (Network interface card) and worked with the switches. The working is basically perform at the given physical layer and subsequently organizing different types of devices that are physically associated together to execute as individual unit.  

The network interface card (NIC) is also known as network adapter and the ethernet card in the network. It is the expansion of the card that basically enable the computer system to connect with the networks.

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