The difference between a Layer 2 switch and a Layer 3 switch

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RicherLink Switch
1. The working level is different: the Layer 2 switch works at the data link layer, and the Layer 3 switch works at the network layer. The Layer 3 switch not only realizes high-speed forwarding of data packets, but also achieves optimal network performance according to different network conditions.
2. The principle is different: the principle of the Layer 2 switch is that when the switch receives a packet from a port, it will first read the source MAC address in the packet, then read the destination MAC address in the packet, and in the address table. Find the corresponding port. If there is a port corresponding to the destination MAC address in the table, copy the packet directly to this port. The principle of a three-layer switch is relatively simple. It is a route exchange multiple times. In general, it is the first source-to-destination route. The Layer 3 switch will transfer this data to the second layer, so next time it is the destination to the source. Source to destination can be exchanged quickly.
3. Different functions: Layer 2 switches are based on MAC address access, only data forwarding, and can not be configured with IP addresses, while Layer 3 switches combine Layer 2 switching technology and Layer 3 forwarding functions, that is, Layer 3 switches are in On the basis of the Layer 2 switch, the routing function is added. You can configure the IP addresses of different VLANs. The VLANs can communicate between different VLANs through Layer 3 routes.
4. Different applications: Layer 2 switches are mainly used for the network access layer and aggregation layer, while Layer 3 switches are mainly used for the network core layer, but there are also a small number of Layer 3 switches used for the aggregation layer.
5. Different supported protocols: Layer 2 switches support physical layer and data link layer protocols, such as Ethernet switches and Layer 2 switches. This hub HUB functions similarly, while Layer 3 switches support the physical layer, data link layer, and network. Layer protocol.

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