In the below configuration, what does
aaa authentication login CON local aaa authentication login VTY group VTY local aaa authentication dot1x default group DOT1x aaa authorization exec VTY group VTY if-authenticated
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That stands for Authentication, Authorization, and Accounting. It controls who is authorized on a device, what authorization each has, and accounting of who is doing what.
Cisco has documents, e.g. Cisco IOS Security Configuration Guide, Release 12.2, that explain what it is and how it works on Cisco devices.