No, Garnet Shield™ does not replace your antivirus software or firewall, but it is an essential part of the Defense in Depth strategy for your computing environment to provide an additional and complementary level of security while protecting your data from multiple forms of attack.
A firewall is the first line of defense and performs actions such as blocking and filtering of network traffic based on IP address and port numbers. An Intrusion Detection System (IDS) behind a firewall detects and alerts a system administrator to malicious activity; an Intrusion Prevention System (IPS) prevents the malicious activity from occurring.
Both firewalls and IDS/IPS solutions are deployed to prevent malicious threats from getting to network endpoints, such as servers, computers or other devices in the first place.
Antivirus software, on the other hand, is typically deployed to protect those endpoint devices from files that do reach your computer. These technologies are complementary in their use and, when deployed together, provide a multi-layered approach to network security.