Which interface is designated as the default LAN interface on a SonicWall device?

The default LAN interface on a SonicWall device is designated as X0. This means that when the SonicWall device is initially configured, the X0 interface is pre-set for LAN traffic. Using X0 for the LAN interface helps streamline the configuration process, as it is the interface expected to provide connectivity to the internal network.

By designating X0 for this purpose, SonicWall creates a standardized method for users to connect their networks, making it easier to understand and manage the setup of firewall rules, network policies, and other configurations. The consistent use of X0 for LAN helps both administrators and users in identifying interfaces correctly, ensuring effective communication within the network and security configurations are consistently applied.

In contrast, other interfaces like X1, X2, and any labeled as WAN are geared toward different roles, primarily dealing with external communications.