(In the current networking use, network security is becoming more and more important, but in the early solution networking, the security requirements were not considered. As a result, the early network design did not consider security equipment. In this situation, the user proposed the network It also requires network security equipment to be upgraded without changing the user's network design; the transparent mode of the firewall came into being in this context, without affecting the user's network. The addition of security devices to the user network not only reduces the workload and risks caused by network adjustment, but also provides users with the required network security functions, protects the use of services in the network, and prevents attacks from causing serious damage.)
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