Computer security alarms are the same. They will greatly reduce your risk of network compromise. Because we can apply economies of scale to firewall management and monitoring, our security solutions will do a better job than what a customer can do at 2 or 3 times the price. A perimeter security solution can prevent certain IP addresses from reaching the Internet. Application level filtering can restrict certain IP addresses on an application or service basis.
Filters can be either inclusive or exclusive.
Packet filtering will reduce the chances that someone from the Internet will be able to exploit some administrative errors or well known application implementation flaws. They will not protect you from unknown weaknesses in the network protocols or application flaws. In addition, packet filters will not be able to detect if someone does managed to get through. Application level filtering will greatly reduce the chances someone will be able to exploit administrative errors or application implementation flaws. This happens because the application filter actually understands the application commands and protocol.