What is a gateway? What is the difference between it and a cat?

Gateways are also called gateways and protocol converters. Gateway is located at the transport layer to realize network interconnection. It is the most complex network interconnection equipment, and is only used for the interconnection of two networks with different advanced protocols. Gateway can be used for wide area network interconnection and local area network interconnection. Gateway is a computer system or equipment that plays an important role in conversion. Gateway is a translator between two systems, which use different communication protocols, data formats or languages, or even completely different architectures. Unlike the bridge that only transmits information, the gateway repackages the received information to meet the needs of the destination system. At the same time, the gateway can also provide filtering and security functions. Most gateways run on the top layer of OSI layer 7 protocol-application layer.

Modem (commonly known as cat) is a kind of computer hardware, which can translate the digital signals of the computer into pulse signals that can be transmitted along ordinary telephone lines. These pulse signals can be received by another modem at the other end of the line and translated into computer-readable language. This simple process completes the communication between two computers.

The network is not about the same level of cats. Simply put, cat dialing needs to be connected to the server of ISP (Internet Access Service Provider) through network association.

Gateways are divided into software and hardware, and gateways on home computers are generally software gateways.