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200-150 · Question #128

On a Cisco router, which configuration register setting bypasses the contents of the NVRAM?

The correct answer is E. 0x2142. Configuration register value 0x2142 sets bit 6, instructing the Cisco router to ignore the startup configuration in NVRAM during boot, which is the standard password recovery method.

Cisco Data Center Networking Technologies

Question

On a Cisco router, which configuration register setting bypasses the contents of the NVRAM?

Options

  • A0x102
  • B0x2102
  • C0x2120
  • D0x2124
  • E0x2142

How the community answered

(20 responses)
  • A
    5% (1)
  • D
    5% (1)
  • E
    90% (18)

Why each option

Configuration register value 0x2142 sets bit 6, instructing the Cisco router to ignore the startup configuration in NVRAM during boot, which is the standard password recovery method.

A0x102

0x102 is not a standard Cisco configuration register value and does not map to a defined NVRAM bypass or special boot behavior.

B0x2102

0x2102 is the factory default configuration register that boots the router normally, loading the startup-config from NVRAM rather than bypassing it.

C0x2120

0x2120 is not a recognized standard Cisco configuration register setting and does not bypass NVRAM contents.

D0x2124

0x2124 is not a defined Cisco configuration register value associated with bypassing NVRAM or password recovery.

E0x2142Correct

0x2142 sets bit 6 in the 16-bit configuration register, which tells the router's bootstrap code to skip loading the startup-config from NVRAM during the boot sequence. This bypasses any stored enable or console passwords, allowing an administrator to enter privileged mode and recover access to the device.

Concept tested: Cisco configuration register 0x2142 NVRAM bypass for password recovery

Source: https://www.cisco.com/c/en/us/support/docs/routers/10000-series-routers/50421-config-register-use.html

Topics

#configuration register#NVRAM bypass#password recovery

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