In fact, switches and routers are about the same, but there are also big differences. Regarding how much the switch is , its price is actually very different. It depends on what you choose. Xiaobian will then go with you to understand the difference between the switch and the router, and the price of the switch is probably.
With the development of the economy, how much is the switch today? The price difference is very large. Klip can give some approximate price of the switch. It ranges from tens of yuan to several thousand yuan. If it is a few hundred yuan for household use, it is enough. So what are the differences between switches and routers? Traditional switches have evolved from bridges and belong to the second layer of OSI, the data link layer device. It is addressed according to the MAC address, routing is selected through the station table, and the establishment and maintenance of the station table is automatically performed by the switch. The router belongs to the OSI layer 3, the network layer device, which is addressed according to the IP address and generated by the routing table routing protocol. The biggest advantage of the switch is fast. Because the switch only needs to identify the MAC address in the frame, it is simple to generate the selective forwarding port according to the MAC address, which is convenient for the ASIC to implement, so the forwarding speed is extremely high. But the working mechanism of the switch also brings some problems.
1. Loop: According to the switch address learning and station table establishment algorithm, loops are not allowed between switches. Once a loop exists, the spanning tree algorithm must be started to block the port that generated the loop. The router's routing protocol does not have this problem. There can be multiple paths between routers to balance the load and improve reliability.
2. Load concentration: There can only be one path between switches, so that information is concentrated on one communication link, and dynamic allocation cannot be performed to balance the load. The router's routing protocol algorithm can avoid this. The OSPF routing protocol algorithm can not only generate multiple routes, but also select different optimal routes for different network applications.
3. Broadcast Control: The switch can only narrow down the collision domain, but not the broadcast domain. The entire switched network is a large broadcast domain, and broadcast messages are scattered throughout the switched network. The router can isolate the broadcast domain, and broadcast packets cannot continue to be broadcast through the router.
4. Confidentiality: Although the switch can also filter the frame according to the source MAC address, destination MAC address, and other frame contents of the frame, the router reports the source IP address, destination IP address, and TCP port address of the packet. Text filtering is more intuitive and convenient.
To know exactly how much a specific switch , you can give a message to Xiaobian, you can also pay attention to the European.
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