Which of the following commands overwrites the bootloader located on /dev/sda without overwriting the partition table or any data following it?

1. A. dd if=/dev/zero of=/dev/sda bs=512
2. B. dd if=/dev/zero of=/dev/sdabs=512 count=1
3. C. dd if=/dev/zero of=/dev/sda bs=440 count=1
4. D. dd if=/dev/zero of=/dev/sda bs=440

Correct Answer: C

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Which parameter must be passed to ifconfig to activate a previously inactive network interface? (Specify the parameter only without any command, path or additional options)

1. A.

Correct Answer: up

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In which file, if present, must all users be listed that are allowed to use the cron scheduling system? (Specify the full name of the file, including path.)

1. A.

Correct Answer: /etc/cron.allow

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Which file lists which users can execute commands using sudo? (Specify the full name of the file, including path.)

1. A.

Correct Answer: /etc/sudoers

When starting a program with the nice command without any additional parameters, which nice level is set for the resulting process?

1. A. -10
2. B. 10
3. C. 20

Correct Answer: C