What is the difference between a switch and a router?
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The difference between a switch and a router: In comparison, the function of the router is stronger than that of the switch, but the speed is relatively slow and expensive. The Layer 3 switch has both the switch line rate forwarding packet capability and the router good control function. Therefore, it is an ideal choice for everyone.
â– What are the switches and routers?
★ Switch (Switch) is a MAC (network card-based hardware address) identification, establishing a temporary networking path between the originator and the receiver.
Switches are classified into Layer 2 switches, Layer 3 switches, or higher-level switches. Layer 3 switches can have routing capabilities and are faster than the low-end routers.
The main features of the switch are: one route, multiple forwarding.
★ Router, also known as a router, is a device that interconnects at the network layer. Network devices that can connect to multiple networks or network segments, including local area networks and wide area networks.
The router has two typical functions, namely data channel function and control function.
â– What are the differences between routers and switches?
A. Different levels of work: switches are simpler than routers, and routers can get more information than switches.
The original switch was at the data link layer of the OSI/RM open architecture, the second layer, and the router was designed to work at the network layer of the OSI model. Since the switch works in the second layer (data link layer) of OSI, its working principle is relatively simple, and the router works in the third layer (network layer) of OSI, which can get more protocol information, and the router can make Smarter forwarding decisions.
B. Data forwarding is based on different objects
The switch uses the physical address or MAC address to determine the destination address for forwarding data. The router uses the ID number (ie IP address) of the different network to determine the address for data forwarding. The IP address is implemented in software and describes the network where the device is located. Sometimes the addresses of these Layer 3 are also called protocol addresses or network addresses. The MAC address is usually provided by the hardware, distributed by the network card manufacturer, and has been solidified into the network card, which is generally unchangeable. IP addresses are usually assigned automatically by the network administrator or the system.
C. The traditional switch can only split the collision domain and cannot divide the broadcast domain; the router can split the broadcast domain.
The network segments connected by the switch still belong to the same broadcast domain. Broadcast packets are transmitted on all network segments connected to the switch. In some cases, communication congestion and security holes are caused. The network segments connected to the router are assigned to different broadcast domains, and the broadcast data does not pass through the router. Although the switch above the third layer has the VLAN function, the broadcast domain can also be divided, but the sub-broadcast domains cannot communicate with each other, and communication between them still requires a router.
(4) The router provides a firewall service
The router only forwards packets of a specific address, does not transmit packet transmissions that do not support routing protocols, and transmits unknown unknown network packets, thereby preventing broadcast storms.
The most fundamental difference is that switches are generally used for LAN-WAN connections, switches are owned by bridges, and are devices at the data link layer. Some switches can also implement Layer 3 switching. The router is used for the connection between the WAN and the WAN, and can solve the forwarding packet between the heterosexual networks and acts on the network layer.
In comparison, the function of the router is stronger than that of the switch, but the speed is relatively slow and expensive. The Layer 3 switch has the ability to forward packets at the line rate and has good control functions of the router. Therefore, it is ideal for everyone. select.

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