Cisco CATALYST 2960 - Understanding no and default Forms of Commands; Almost every configuration command also has a no form. In general, use the no form to disable a feature or function or reverse the action of a command. For example, the no shutdown interface configuration command reverses the shutdown of an interface. Use the command without the keyword no to re-enable a disabled feature or to enable a feature that is disabled by default.; Configuration commands can also have a default form. The default form of a command returns the command setting to its default. Most commands are disabled by default, so the default form is the same as the no form. However, some commands are enabled by default and have variables set to certain default values. In these cases, the default command enables the command and sets variables to their default values.; Understanding CLI Error Messages

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Catalyst 2960 Switch Hardware Installation Guide
OL-7075-09
Chapter 4 Troubleshooting
Locating the Switch Serial Number
The switch now behaves like an unconfigured switch. You can configure the switch by using Express
Setup as described in the switch getting started guide that is included with the switch.
You can also configure the switch by using the CLI setup procedure described in Appendix C,
“Configuring the Switch with the CLI-Based Setup Program.”
Locating the Switch Serial Number
If you contact Cisco Technical Assistance, you need to know the serial number of your switch. See
Figure 4-1 through Figure 4-3 to locate the serial number on your switch. You can also use the show
version command to get the serial number.
Figure 4-1 Serial Number Location on the Catalyst 2960-24PC-L, 2960-24LT-L, 2960-48PST-L, 2960-24TC-S,
2960-48TC-S, 2960-24TT-L, 2960-48TT-S, 2960-48TT-L, 2960G-24TC-L, 2960-24PC-S, 2960-24LC-S,
2960-48PST-S, and 2960G-48TC-L Switches
Figure 4-2 Serial Number Location on the Catalyst 2960-24-S, 2960-24TC-S, and 2960-48TC-S Switches
Cisco 11-character label
SN: XXXNNNNXXXX
140035, 0781-00374-01
191931
SN: XXXNNNNXXXX