Network adapters are also called network cards or network interface cards. A network card is a piece of computer hardware designed to allow computers to communicate on a computer network. It enables users to connect with each other by cable or wireless.
The crab card network card is the realtek network card, and its icon looks like a crab, so it is called the crab card network card. Each network card has a unique 48-bit serial number called MAC address, which is written in a ROM on the card. The network card is equipped with a processor and a memory (including RAM and ROM). The communication between the network card and the LAN is carried out by serial transmission through cables or twisted pairs.
Network card selection guide
1, network type
There are Ethernet, token ring network, FDDI network and so on, and the corresponding network card should be selected according to the type of network.
2. Transmission rate
The transmission rate of the network card should be selected according to the bandwidth requirements of the server or workstation and the maximum transmission rate provided by the physical transmission medium. Take Ethernet as an example, there are many available rates, such as 10Mbps,100 Mbps, 1000Mbps, or even 10Gbps, but the higher the rate, the more appropriate it is. For example, it is a waste to configure a 1000M network card for a computer connected to a twisted pair with a transmission speed of only1000 m, because it can only achieve a transmission speed of1000 m at most.
3. Bus type
Common bus slot types in computers are ISA, EISA, VESA, PCI and PCMCIA. The intelligent network card with PCI or EISA bus is usually used on the server, the common network card with PCI or ISA bus is used on the workstation, and the network card with PCMCIA bus or portable network card with parallel interface is used on the notebook computer. PC basically no longer supports ISA connection, so when buying a network card for your own PC, don't buy an outdated ISA network card, but buy a PCI network card.
4. Cable interfaces supported by the network card
The network card is ultimately connected to the network, so there must be an interface to connect the network cable with other computer network devices through it. Different network interfaces are suitable for different network types. Common interfaces mainly include RJ-45 interface of Ethernet, BNC interface of thin coaxial cable, AUI interface of thick coaxial cable, FDDI interface and ATM interface. Moreover, some network cards provide two or more types of interfaces in order to be suitable for a wider application environment. For example, some network cards will provide RJ-45, BNC interface or AUI interface at the same time.