Which layer does the router work on?

A router is a device in the network that works at the computer network layer. The computer network layer is the third layer in the OSI model. It is also called the network layer protocol and is responsible for transmitting data packets between different networks. , and determine the best path for data packets. As one of the key devices of the network layer, the router is responsible for forwarding and routing of data packets in the network.

# Operating system for this tutorial: Windows 10 system, Dell G3 computer.

A router is a device in the network that works at the computer network layer (network layer).

The computer network layer is the third layer in the OSI (Open Systems Interconnection) model, also known as the network layer protocol. It is responsible for transmitting data packets between different networks and deciding the best path for the data packets. Among them, the router, as one of the key devices in the network layer, is responsible for forwarding and routing of data packets in the network.

Specifically, the router checks the destination IP address in the header of the data packet, determines the next hop path of the data packet based on the preset routing table, and sends the data packet to the appropriate destination network. In this way, the router is able to forward information from the source network to the destination network and implement data switching and routing within the network.

Routers can connect to different networks, such as local area networks (LAN), wide area networks (WAN), or the Internet. It can handle multiple network protocols, such as IPv4, IPv6, etc., and use routing protocols (such as RIP, OSPF, BGP, etc.) to maintain and update routing tables to ensure that data packets can be forwarded correctly according to the best path.

In short, routers work at the network layer in computer networks and are responsible for the forwarding and routing of data packets, so that data can be effectively transmitted between different networks.

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