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Question 54 - 100-490 discussion

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Which bits represent the boot field in the configuration register value?

A.

highest two bits

Answers
A.

highest two bits

B.

lowest two bits

Answers
B.

lowest two bits

C.

highest four bits

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C.

highest four bits

D.

lowest four bits

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D.

lowest four bits

Suggested answer: D

Explanation:

The configuration register on Cisco devices is a 16-bit value, typically represented in hexadecimal notation (e.g., 0x2102). The lowest four bits (bits 0-3) of this value are designated as the boot field.

The Boot Field's Importance:

The boot field determines how the device will load its operating system (Cisco IOS) during the startup process. Here's a basic breakdown of common boot field values:

0x0: Stay at the ROMmon prompt.

0x1: Boot from ROM (often used for troubleshooting or recovery).

0x2 - 0xF: Load the operating system based on settings in the startup configuration (NVRAM) or from a network server if specified.

Example:

A configuration register value of 0x2102 indicates that the boot field is 0x2 (the last digit). This is a common default setting, instructing the device to load the Cisco IOS image from Flash memory.

Cisco Configuration Register Detailed Explanation: [invalid URL removed]

Configuration Register Settings (Cisco): https://networklessons.com/cisco/ccna-routing-switching-icnd1-100-105/configuration-register-cisco-ios

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asked 07/10/2024
Angelo Gulisano
36 questions
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