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Cisco's IOS commands are associated with fifteen different levels of privilege.
- Level one is user mode; users can look at configurations but make no changes.
- Level two is used with minimal access. Commands such as show, ping, and debug are used for monitoring and testing.
- Level fifteen is the highest privilege mode; reload, erase NVRAM, erase flash, and shutdown are examples of level fifteen commands.
To customize privilege levels, use the privilege level configuration command.
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