Which two keystrokes will auto-complete a command in a Junos CLI? (Choose two.)

In the Junos CLI, using the Tab key is the primary way to auto-complete commands. When you start typing a command and press the Tab key, the system will attempt to complete the command based on what has been partially entered. If there are multiple possible completions, pressing Tab twice will display a list of available command options that match the input.

Also, using Shift + Tab can be functional in some contexts to cycle through previous inputs for certain terminal emulators, but in the context of the Junos CLI, the Tab key is standard for auto-completion of commands. This is specific to the command-line interface and aids users in quickly and efficiently navigating the command structure without having to recall the exact command syntax. The other options, such as the Spacebar or Enter key, do not serve the purpose of auto-completing commands in this environment.