Conclusion
The configuration modes discussed here are only a few of those available in the Cisco IOS. All the configuration modes operate in the same fashion. You can enter them and exit them all the same way and with a similar syntax. Use of the ? operator in any of the EXEC or command modes will list the available command options. This help operator is an invaluable tool because no one wants to memorize the command syntax to every feature in the Cisco IOS and rarely do Network Professionals carry the complete IOS command set publications with them.
Table 3.2 recaps the most used command modes, their corresponding router prompts, what the command mode is used for, and the command used to enter that mode.
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