1. How Do UTM Firewalls Protect Users? Whether they’re called unified threat management, next-generation, software-defined WAN or secure access service edge, firewalls need to have advanced Layer 7 knowledge to protect users. A combination of application intelligence and threat mitigation is needed. The buzzword isn’t as important as the features you turn on: application management, anti-malware, URL filtering, intrusion prevention and (in many environments) user authentication.