Which actions can add a host to the blocked sites list?

Enabling the AUTO-block sites feature in a deny policy is a valid action to add a host to the blocked sites list because it automatically identifies and blocks sites that match particular criteria, effectively managing and controlling access to unwanted content based on predefined rules. This approach allows administrators to maintain a dynamic response to potentially harmful or non-compliant web traffic without needing to manually update the list frequently.

The other actions, while related to managing site blocking, do not directly add a host to the blocked sites list in the automatic manner that the AUTO-block feature does. Adding a site to the Blocked Sites Exceptions list primarily serves to specify exceptions rather than block access, and utilizing the Add function in either the Blocked Sites tab of the Firebox System Manager or the Policy Manager's settings requires manual input which may not be as efficient in managing specific threats as the automatic feature.