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NTC/362: Fundamentals of Networking

 NTC/362: Fundamentals of Networking

Q: Your switch is in an air-conditioned locked wiring closet on the first floor of the building. There is a card reader on the door that allows only authorized personnel in the room. On Thursday, you used SSH to connect to this switch and issued the following commands:

Switch(config)# hostname SW1
SW1(config)# end
SW1# logout

The following Monday morning, you telnet into the switch, and run the show version command, and see the following output:

Switch#show version
Cisco IOS Software, C3560 Software (C3560-IPSERVICESK9-M), Version 12.2(53)SE2, RELEASE SOFTWARE (fc3)
Technical Support: Support - Cisco Support and Downloads – Documentation, Tools, Cases
Copyright (c) 1986-2010 by Cisco Systems, Inc.
Compiled Wed 21-Apr-10 05:33 by prod_rel_team
Image text-base: 0x01000000, data-base: 0x02E00000
ROM: Bootstrap program is a C3560 boot loader
BOOTLDR: C3560 Boot Loader (C3560-HBOOT-M) Version 12.2(44)SE5, RELEASE SOFTWARE (fc1)
Switch uptime is 1 day, 3 hours, 24 minutes
System returned to ROM by power-on
System image file is "flash:/c3560-ipservicesk9-mz.122-53.SE2.bin"
This product contains cryptographic features and is subject to United
States and local country laws governing import, export, transfer, and
use. Delivery of Cisco cryptographic products does not imply
third-party authority to import, export, distribute or use encryption.
Importers, exporters, distributors, and users are responsible for
compliance with U.S. and local country laws. By using this product you
agree to comply with applicable laws and regulations. If you are unable
--More--

Based on this output, what is the cause for the state of the hostname for this switch?

A: You forgot to save the configuration to NVRAM.

Explanation: Unless the configuration is saved to NVRAM, the switch will not use the updated configuration information, including the hostname, the next time it reboots. The show version shows a reboot, which could be due to loss of power and restoration of power, that occurred 1 day, 3 hours, and 24 minutes previous to when the user issued the show command, and that is when it reverted back to its original hostname.

Configurations may be saved to NVRAM, TFTP servers, and other destinations, but not to a configuration register. The exit command is not required to effect a change to a hostname, which happens automatically in RAM when Enter is pressed. There is no rollback feature by default in IOS.

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