CFS uses Content Filter Action Objects in Content Filter Rules (see OBJECT | Action Objects > Content Filter Actions | +Add) to identify URIs and domains for filtering and to specify the type of action to be taken when filtering.
Under the CFS rating design, a domain can be resolved to one of four ratings; from highest to lowest priority, the ratings are:
If the URL is not categorized into any of these ratings, then the operation is allowed. For more information about Content Filter Action Objects, see Configuring Content Filter Objects.