Traditional Culture Encyclopedia - Traditional stories - What is the main difference between a switch and a router?
What is the main difference between a switch and a router?
1. Different working levels: Switches work at the data link layer of the OSI/RM open architecture, while routers are designed to work at the network layer of the OSI model from the beginning.
2. Data forwarding is based on different objects: the switch uses the physical address or MAC address to determine the destination address of the forwarded data.
The router uses the ID numbers (i.e. IP addresses) of different networks to determine the address for data forwarding.
3. Traditional switches can only divide collision domains, but not broadcast domains; routers can divide broadcast domains.
4. Routers provide firewall services. Switches are generally used for LAN-LAN connections. Switches are classified as bridges and are devices at the data link layer. Some switches can also implement third-layer switching.
5. In specific metropolitan area networks, switches often play the role of VLAN transparent transmission, that is, they are bridges.
The router does not support Layer 2 by default. Each port of the router is an independent broadcast domain and collision domain.
Extended information: Switch purpose: The main functions of the switch include physical addressing, network topology, error checking, frame sequence and flow control.
The switch also has some new functions, such as support for VLAN (Virtual LAN), support for link aggregation, and some even have firewall functions.
Router Purpose: From the perspective of filtering network traffic, routers function very similarly to switches and bridges.
However, unlike switches that work at the network data link layer and physically divide network segments, routers use specialized software protocols to logically divide the entire network.
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