At which layer does the gateway work?
The gateway works at the third layer "network layer" and the seventh layer "application layer": 1. The network layer gateway, called a router, is responsible for transmitting data packets between different networks and transmitting them according to the target IP addresses make forwarding and routing decisions; 2. Application layer gateway, called proxy gateway or application gateway, provides conversion and processing functions of application layer protocols, allowing communication between different types of applications.
# Operating system for this tutorial: Windows 10 system, Dell G3 computer.
Gateways usually work at layer 3 (network layer) and layer 7 (application layer) in the network model. Depends on what it does and how it's implemented.
Network layer gateway: This kind of gateway is also called a router and works on the third layer of the network model. It is responsible for delivering packets between different networks and making forwarding and routing decisions based on the destination IP address. Network layer gateways can connect multiple LANs or WANs to help achieve cross-network communication and interconnection.
Application layer gateway: also called proxy gateway or application gateway, it works on the seventh layer of the network model. It provides conversion and processing functions of application layer protocols, allowing communication between different types of applications. The application layer gateway can handle HTTP, FTP, SMTP and other protocols, and perform protocol conversion, security encryption, load balancing and other operations to achieve application layer services and control.
It should be noted that the function and location of the gateway can vary depending on the specific network architecture and needs. Some network deployments may involve gateways located at other levels to complete specific tasks and functions.
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