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ccna certification in nigeria.User mode: Allows only a limited number of basic monitoring commands, often referred to as watch-only mode, which does not allowChapter 3 Device Access and IOS Configuration . 27 .Execute any commands that may change the configuration of the device. level 1. the prompt is privileged mode: All configuration and management commands can be executed. level 15. the prompt is "#". Global configuration mode: Entering global configuration mode from privileged mode allows you to configure global parameters or enter other configuration sub-modes, such as interface mode, routing mode and linear mode. The prompt is "# (config)". The privileged mode can be returned by the letter t or end command, the difference is that the exit command returns step by step, while the end command returns directly to the privileged mode. Interface mode: used to configure a network interface, the prompt is "# (config-if),,o Line mode: used to configure a line, including an actual line (such as console and AUX) or a virtual line (such as VTY, etc.), the prompt is "# (config-line)Mo Routing mode. Used to configure a routing protocol, such as RIP, EIGRP, and OSPF, etc., with the prompt "# (config.router)".The CLI provides simple but complete editing and help functions. The common editing key combinations used in the CLI are shown in Table 3-1.Table 3.1 Commonly used editing keys in CLIEdit Key Command Function[Crtl+A] Moves the cursor to the beginning of the command line[Crtl+E] Move the cursor to the end of the command line[Crtl+P] (or [ t]) Reuse the previous command[Crtl+N] (or [1]) Reuse the next command