Which method allows the execution of advanced settings and diagnostics on FortiGate?

The correct answer is the CLI, as it provides comprehensive control and access to advanced settings and diagnostics on FortiGate devices. The Command Line Interface (CLI) allows network professionals to execute detailed commands and scripts that can provide deep insights into the configuration, status, and performance of the firewall.

Through the CLI, users can perform tasks that often go beyond the capabilities found in the graphical user interface (GUI), such as executing configuration changes in bulk, running diagnostic commands that offer real-time feedback, and accessing advanced options that may not be exposed in the GUI. The CLI is particularly valuable for troubleshooting, as it allows for precise commands that can pinpoint issues and swiftly resolve them.

While the GUI and web interface provide user-friendly navigation and management of the FortiGate devices, they may not give access to all advanced settings or diagnostics needed for in-depth network management. The REST API, while increasingly used for automation and integration purposes, may also lack the immediacy and detail that can be obtained through CLI commands.

The CLI stands out as the most powerful tool for detailed configuration and analysis, making it the method of choice for executing advanced settings and diagnostics effectively on FortiGate.