(An essential part of any enterprise security strategy is the implementation and maintenance of firewalls, so firewalls play a major role in the implementation of network security. Firewalls are generally located at the edge of an enterprise network, which blocks the internal network from the Internet or from other external networks, restricts network access and maintains the internal network of the enterprise. The purpose of setting the firewall is to build the only channel between the internal network and the external network, and simplify the security management of the network.)
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