The network card belongs to the physical layer and link layer of OSI. It works in the MAC sublayer of the physical layer and data link layer.
Network card, also known as network interface controller, also known as network interface controller, network adapter, network card, or LAN receiver, is a piece of equipment designed to allow Computer hardware for computers to communicate on a computer network; the connection between a computer and an external LAN is through a network card. Because it has a MAC address, it belongs to Layer 1 (physical layer) of the OSI model; it allows users to connect to each other via cables or wirelessly.
Main functions of the network card:
1. Realize the communication connection with the host bus, interpret and execute the control commands of the host.
2. Implement the functions of the data link layer.
3. Realize the functions of the physical layer. The network card is referred to as the network interface card. It is one of the important connection devices in the computer LAN. The computer accesses the network through the network card.
Network card classification:
1. Classification according to the type of computer supported by the network card
is mainly divided into standard Ethernet card and PCMCIA network card: standard Ethernet card Networking is used in desktop computers, while PCMCIA network cards are used in laptop computers.
2. According to the transmission rate supported by the network card, it is mainly divided into four categories: 10Mbps network card, 100Mbps network card, 10/100Mbps adaptive network card and 1000Mbps network card.
3. Classification according to the bus type supported by the network card
It can be mainly divided into ISA, EISA, PCI, etc.
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