(Network security includes not only user oriented terminal devices, such as servers, workstations, but also network transmission devices, such as routers, switches, etc. Once these devices have problems, they will bring disastrous consequences to the network. To protect the security of the network, we first need to ensure that all the devices inside the network are safe and reliable. In order to protect the security of the access devices in the network, we can generally authenticate and manage the security of all the accessed users in the network on the port of the access switch, so as to protect the security inside the network. The external network security can be realized on the router.)
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