Which of the following statements is true regarding SonicWall's default policy settings?

The statement that all rules are set to deny by default is accurate because SonicWall devices are designed with a security-first approach. This means that when a SonicWall firewall is first installed, it will not allow any traffic to pass through unless explicitly permitted by specific rules that are created by the administrator. This default configuration helps to safeguard the network from unauthorized access and potential vulnerabilities by ensuring that only well-defined traffic flows are authorized.

The importance of this default deny policy lies in its basic principle of least privilege, which is critical for maintaining security. By denying all traffic initially, administrators have the opportunity to carefully analyze and define the rules that best fit the needs of the organization without inadvertently exposing the network to risks associated with open access.

In contrast, the other options suggest varying levels of openness or restricted access that do not align with the fundamental security posture of SonicWall’s default settings, which prioritizes blocking until explicitly allowed.