1 Gateway and network card are not the same.
A gateway is a facility dao that operates above the OSI transport layer in the du interconnection network, so it is called a zhuan facility because the gateway is not necessarily a device, and it is possible to implement the gateway function in a host. Of course, the use of a computer to specifically implement the protocol conversion function of the gateway is not excluded.
Because the gateway is the facility that realizes interconnection, intercommunication and application interoperability. It is usually used to connect to dedicated systems, so there has never been an advertisement or company that sells gateways in the market. Therefore, in this sense, the gateway is a concept or an abstraction of a function. The scope of the gateway is very wide. In the TCP/IP network, the gateway sometimes refers to the router. In the MHS system, in order to realize the interoperability between the CCITTX.400 and the SMTPL simple mail transport protocol, there is also the concept of a gateway. SMTP is an e-mail used in the TCP/IP environment. Its standard is RFC-822. The international standard CCITTX.400 developed late, but it is supported worldwide by Europe as a pioneer. In order to interconnect the two systems, the TCP/IP standard-making body specifically defined the conversion standard RFC987 (applicable to X.400 in 1984) between X.400 and RFC-822, and RFC1148 (applicable to X.400 in 1988) ). The facility that implements the above conversion standards is also called a gateway.
2
Gateway: Router bai, is the mark that transcends the local network in the network du, (Gateway) is the zhuan "gateway" that connects a dao network to another network.
Network Card Shu: Short for Network Interface Card (NIC), it is one of the most important connection devices in a computer local area network. The computer connects to the network through a network card.
A network hardware device. The network card is the interface device between the network terminal and the network. The
gateway may be hardware or software. It has two functions. One is to connect two or more different networks with the same protocol, and the other is to convert different protocols in the same network.
3
The network card is a piece of hardware. The
gateway
is the "gateway" that connects one network to another. The network card is a network hardware device. The network card is the interface device between the network terminal and the network.
The gateway may be hardware or software. It has two functions. One is to connect two or more different networks using the same protocol, and the other is to convert different protocols in the same network.