XK0-005 Question #1179: Real Exam Question with Answer & Explanation

Question

A systems administrator wants to disable the Linux Kernel WatchDog Timer Driver for security purposes. Which of the following will accomplish this task?

Options

• AAdd blacklist watchdog to the /etc/modprobe.d/blacklist file.
• BRename the /etc/modprobe.d/watchdog file to watchdog.off instead.
• CRemove the watchdog=1 from the /usr/modules/watchdog.conf file.
• DAdd watchdog=0 to the /etc/modprobe.conf file.

Explanation

To disable the Linux Kernel WatchDog Timer Driver for security purposes, the administrator should blacklist the watchdog module.

Common mistakes.

• B. Renaming a file in /etc/modprobe.d/ might prevent specific configurations from being loaded, but it's not a direct or guaranteed way to stop a module from being loaded if it's referenced elsewhere or loaded by default.
• C. There is no standard /usr/modules/watchdog.conf file, and removing a line like watchdog=1 is not the correct mechanism to disable a kernel module.
• D. Adding watchdog=0 to /etc/modprobe.conf is not a valid or standard way to disable a kernel module; the blacklist directive is used for this purpose.

Concept tested. Linux kernel module blacklisting

Reference. https://man7.org/linux/man-pages/man5/modprobe.d.5.html

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