200-150 · Question #104
A network engineer is changing the boot process of a router from its original state to one that boots from ROMMON. Which option in Cisco IOS should be changed?
The correct answer is A. config register number. The Cisco configuration register is a 16-bit value in NVRAM that controls the router boot behavior, including forcing the router into ROMMON mode by setting it to 0x2100.
Question
A network engineer is changing the boot process of a router from its original state to one that boots from ROMMON. Which option in Cisco IOS should be changed?
Options
- Aconfig register number
- BRMON
- Cbootflash settings
- Dterminal history
How the community answered
(42 responses)- A93% (39)
- C5% (2)
- D2% (1)
Why each option
The Cisco configuration register is a 16-bit value in NVRAM that controls the router boot behavior, including forcing the router into ROMMON mode by setting it to 0x2100.
The configuration register value determines how and from where the Cisco IOS router boots. Setting the config register to 0x2100 instructs the router to bypass the normal IOS load process and boot directly into ROM Monitor (ROMMON) mode, which is used for password recovery and low-level diagnostics.
RMON (Remote Monitoring) is a network management MIB standard used for traffic analysis and monitoring - it has no relationship to the router boot sequence.
Bootflash is the internal flash storage where IOS images reside; modifying files there does not change the boot mode to ROMMON - that behavior is controlled solely by the config register.
Terminal history is a CLI feature that stores previously entered commands for recall, and has no effect on the router boot process.
Concept tested: Cisco IOS config register boot mode control
Source: https://www.cisco.com/c/en/us/support/docs/routers/10000-series-routers/50421-config-register-use.html
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