Definition of transparent mode for the firewall

For the firewall, the transparent mode is a common deployment mode.
The service interfaces of the device work at Layer 2 (data link layer) to forward Layer 2 packets. In this case, the device can serve as a switch and can perform security protection on the traffic without changing the original network structure and configuration after being connected to the original gateway device in transparent mode. Therefore, this deployment mode is usually called the "transparent mode".

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