Global Configuration Mode
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Global Configuration Mode is the privilege level in Cisco Systems IOS used to configure global router and network switch parameters. The mode is entered from enable mode using the command "configure terminal", more commonly expressed as "conf t".
router# configure terminal
router(config)#
From inside this mode, you can enter several types of commands: interface commands to enter Interface Configuration Mode, which allow you to configure physical interfaces, line commands, to configure terminal lines, and router commands to configure routing protocols.