A network system can face multiple attacks at the same time. For example, different viruses could attack separate parts of a network simultaneously. When such an event takes place and your utilizing different security appliances from different vendors, it will be difficult to control these appliances in preventing all the attacks. This is why the Unified Threat Management (UTM) approach becomes crucial to be implemented in a network.
UTM refers to having a single security device or solution which comes with multiple security features to allow control and managing of your network security from a single central point.
UTM comes with Antivirus, VPN, Firewall, Anti-spam, Intrusion detection and prevention, Anti-spyware and many other security and network features. All of these features can be monitored and controlled from a central point.