External network cards are of two types: Wireless and USB based. In desktops and laptops that do not have an internal NIC, external NICs are used. The first type uses Peripheral Component Interconnect (PCI) connection, while the second type uses Industry Standard Architecture (ISA).
It requires network cables to provide network access. In internal networks cards, motherboard has a slot for the network card where it can be inserted. it provides the necessary hardware circuitry so that the physical layer processes and some data link layer processes can run on it. NIC is both a physical layer and a data link layer device, i.e. NIC allows communications between computers connected via local area network (LAN) as well as communications over large-scale network through Internet Protocol (IP). NIC allows both wired and wireless communications. It is also called network interface controller, network adapter or LAN adapter. It is a circuit board installed in a computer that provides a dedicated network connection to the computer.
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