Which bits represent the boot field in the configuration register value?
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A. B. C. D.D.
The configuration register is a 16-bit value that controls various settings on Cisco routers and switches, including how the device boots up. One of the fields in the configuration register is the boot field, which determines the boot process for the device.
The boot field is made up of the lowest four bits of the configuration register. These four bits are sometimes referred to as the boot mode bits because they determine the boot mode that the device uses when it powers up.
The boot mode bits have the following values:
Bit 0: If this bit is set to 0, the device uses ROM monitor mode, which allows for low-level troubleshooting and configuration. If this bit is set to 1, the device skips the ROM monitor and boots directly into the IOS software.
Bit 1: If this bit is set to 0, the device uses the default boot image specified in the boot system command. If this bit is set to 1, the device ignores the default boot image and attempts to load the first valid IOS image it finds in flash memory.
Bit 2: If this bit is set to 0, the device uses the default configuration file specified in the boot system command. If this bit is set to 1, the device ignores the default configuration file and enters setup mode, which allows for initial configuration of the device.
Bit 3: If this bit is set to 0, the device boots up normally. If this bit is set to 1, the device boots up in diagnostic mode, which runs a series of diagnostic tests on the hardware.
Therefore, the correct answer to the question is D - the lowest four bits represent the boot field in the configuration register value.