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1. A network security appliance is any network appliance that has the purpose of protecting a computer network from any potential threats and unwanted traffic. Network security appliances usually consist of various embedded network appliances network management protocols or rules and security devices that are installed on-site. A network appliance is a broader term then a network security appliance. Network appliances are all appliances that provide security to the network but also make remote management easier, cut costs and aid the flow of information between computing devices inside one system. They also improve communication between two different networks, or one network and the Internet. Some of the services provided by a network appliance include authentication, IP address management caching, network address translation, firewall functions and many more. All-in-one security devices, also known as Unified Threat Management (UTM), are the most popular form of network security for businesses and organizations because they are extensive and effective. These devices are designed to protect companies from various threats and to reduce complexity at the same time. UTM’s integrate a wide variety of security features in one appliance, like firewalls, anti-viruses, intrusion prevention and intrusion detection systems, etc.