From architecture perspective, Cisco ASA and FTD (Firepower Threat Defense) operate in different ways. ASA operate at Layer 3/4, whereas FTD operate at Layer 7. Even the CLI behaves in such different ways. So, will look at most important commands which are to be used on Cisco FTD devices.
01. CLI mode for Advanced troubleshooting
By default, you will see something like this.
But in order to run additional commands, you will have to access the CLI. In order to access the CLI, you can simply execute the command system support diagnostic-cli
02. Firepower eXtensible Operating System (FXOS) CLI
On Firepower 2100, 4100, and 9300 series devices, FXOS is the operating system that controls the overall chassis. Depending on the model, you use FXOS for configuration and troubleshooting. From FXOS, you can enter the Firepower Threat Defense CLI using the connect ftd command.
you may either use connect ftd or connect fxos
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