Cisco CATALYST 2960 - Controlling Environment Variables; With a normally operating switch, you enter the boot loader mode only through a switch console connection configured for 9600 b;s. Unplug the switch power cord, and press the switch Mode button while reconnecting the power cord. You can release the Mode button a second or two after the LED above port 1 turns off. Then the boot loader switch: prompt appears.; The switch boot loader software provides support for nonvolatile environment variables, which can be used to control how the boot loader, or any other software running on the system, behaves. Boot loader environment variables are similar to environment variables that can be set on UNIX or DOS systems.

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Catalyst 2960 Switch Command Reference
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Chapter 2 Catalyst 2960 Switch Cisco IOS Commands
dot1x critical (global configuration)
Related Commands Command Description
dot1x critical (interface
configuration)
Enables the inaccessible authentication bypass feature, and
configures the access VLAN for the feature.
show dot1x Displays IEEE 802.1x status for the specified port.