What are the three principal physical deployment methods for the ProxySG?

The three principal physical deployment methods for the ProxySG are indeed best represented by inline, virtually inline, and out of path.

In an inline deployment, the ProxySG is placed directly in the data path between the client and the internet, allowing it to inspect and control all traffic that passes through. This method offers the highest level of security and performance because all packets are processed without bypassing the proxy.

The virtually inline deployment method offers a balance; it requires configuration that allows it to still analyze traffic without being in the direct data path. This setup often leverages techniques like port mirroring or network taps, enabling the proxy to gather necessary data without affecting the flow of traffic.

Out of path deployment refers to configurations where the ProxySG is not directly in the traffic path, but still collects or assesses traffic information. This setup is beneficial for environments where direct insertion would create bottlenecks or performance issues.

This specific classification allows organizations to choose the deployment method that best fits their architecture and performance requirements, maximizing both security and efficiency.