What role does a switch, router, firewall, and wireless AP play in the network?
The connection process is as follows: the external network fiber enters the firewall after passing through the gateway, and the outbound end of the firewall accesses the core switch. The outbound end of the core switch is connected to the AC controller and the aggregation switch, the aggregation switch is connected to the router and the AP, and the terminal PC and the wireless network are connected. The device connects to the Internet through the AP and the router.
1, The firewall
The firewall mainly plays an isolation role in the whole network. It separates and then connects the external network and the intranet users from the physical level. It combines software and hardware to first access the intranet from the external network. Users and data are blocked outside the door, and then through unified analysis and judgment of established rules, users who meet the rules and have access to the internal network, users who do not meet the rules and have no rights can not enter the intranet.
2, The core switch
The core switch is the entire network data processing center, which requires huge data throughput and processing functions. The internal network link is divided by it. The IP address of the used terminal and intermediate network device is uniformly allocated by it, and the network bandwidth required by all the connected devices. It is provided by it in unison.
3, AC controller
The main function of the AC controller is to provide unified management and various functional implementations for the AP, which is what we often call WIFI. Such as: AP address pool setting, AP connectable user number setting, AP traffic data monitoring, AP bandwidth limitation, and so on. Simply put, the AP's own functions are centralized on the AC controller, so you don't have to set each AP separately.
4, Aggregation switch
Its function is to uniformly process the data of the terminal Internet access device, routing device, switching device, AP, etc., and communicate with the core switch to ensure that the back-end devices can connect to the Internet. At the same time, it also has the function of signal amplification and power supply to the AP.
5, Router and AP
Today's routers and APs have basically the same functions. It is a comprehensive device that integrates routing, switching, and WIFI functions. The role is data exchange processing, network link and IP distribution, wireless transceiver. At the same time, it also has a signal relay amplification function.
6, The end of the Internet device
Terminal devices such as computers, IPADs, mobile phones, etc., through wired and wireless data interaction with end routers and APs, to connect to the Internet, browse and acquire network resources.