An OfficeScan client uses the Smart Scan Agent Pattern to scan for security risks and only queries the Smart Scan Pattern if the Smart Scan Agent Pattern cannot determine the risk of a file. The client queries the Web Blocking List when a user attempts to access a website. Advanced filtering technology enables the client to "cache" the query results. This eliminates the need to send the same query more than once.

Clients that are currently in your intranet can connect to a Smart Protection Server to query the Smart Scan Pattern or Web Blocking List. Network connection is required to connect to the Smart Protection Server. If more than one Smart Protection Server has been set up, administrators can determine the connection priority.

Clients that are currently not in your intranet can connect to Trend Micro Smart Protection Network for queries. Internet connection is required to connect to the Smart Protection Network.

Clients without access to the network or the Internet still benefit from protection provided by the Smart Scan Agent Pattern and the cache containing previous query results. The protection is reduced only when a new query is necessary and the client, after repeated attempts, is still unable to reach any smart protection source. In this case, a client flags the file for verification and temporarily allows access to the file. When connection to a smart protection source is restored, all the files that have been flagged are re-scanned. Then, the appropriate scan action is performed on files that have been confirmed as a threat.

The following table summarizes the extent of protection based on the client’s location.