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Network layer protection can ensure the inbound network packets are legitimate, but it can do little about the contents hiding in the packets.

It is the first personal firewall with an application-based intrusion detection system (IDS). With newly added network layer protection measures and existing application level protection, Sygate Personal Firewall Pro provides complete security from the network to the application layer. It is the first personal firewall that offers real protocol driver-level protection, preventing hostile programs such as Trojan Horses and malicious mobile code from accessing the network using their own protocol driver.