What are the three deployment options available for a security gateway?

 A security gateway is a device that enforces the security policy on the traffic that passes through it. There are three deployment options available for a security gateway: Standalone, Distributed, and Bridge Mode. Standalone means that the security gateway and the security management server are installed on the same machine. Distributed means that the security gateway and the security management server are installed on separate machines. Bridge Mode means that the security gateway acts as a transparent bridge between two network segments, without changing the IP addressing scheme1. References: Check Point R81 Security Gateway Technical Administration Guide