What is the purpose of the command 'configure terminal'?

The command 'configure terminal' is used to access global configuration mode on a Cisco device. This mode allows administrators to make changes to the device's configuration. In global configuration mode, various settings can be adjusted that affect the operation of the device, including interface configurations, routing protocols, and access control lists.

By entering 'configure terminal' from user exec mode, an administrator transitions into a more privileged state that allows for the configuration of the device's settings. It is a foundational step for any configuration changes desired on the device, as global configuration mode provides access to all relevant command sets for configuration.

Contextually, understanding this command is essential for anyone managing Cisco devices, as the global configuration mode is where the majority of the configuration tasks are performed.