Which mode is indicated by the prompt (config)# in Cisco IOS?

The prompt (config)# in Cisco IOS indicates that the device is in Global Configuration mode. This mode is where a network administrator can make changes to the device's configuration. In Global Configuration mode, you can configure system-wide settings as well as enter sub-modes for specific configurations, such as interface configuration or routing protocols.

This mode is accessed from Privileged EXEC mode, which is indicated by the prompt (hostname)#. When in Global Configuration mode, you can perform tasks such as enabling interfaces, configuring protocols, setting passwords, and defining other system-wide parameters that affect the entire device. The configuration made in this mode is saved to the device’s running configuration and can be saved to the startup configuration if desired.

Understanding the hierarchy of Cisco IOS modes is crucial for managing network devices effectively, as each mode has a distinct purpose and set of commands available.