Practice Test Geeks(010-160) LPI Linux Essentials Practice Test
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System Security & User Permissions Flashcards

7 cards from real 010-160 practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. Which file defines which users and groups can use sudo?

    Answer: /etc/sudoers

    /etc/sudoers (edited safely with visudo) controls sudo access policies.

  2. How would you add an existing user 'alice' to the 'wheel' group without removing her from other groups?

    Answer: usermod -aG wheel alice

    `usermod -aG wheel alice` appends (-a) alice to the supplementary group (-G) wheel.

  3. What does 'umask 027' mean for newly created files?

    Answer: Files get permissions 640

    Default file permissions (666) minus umask (027) = 640, giving rw-r----- for new files.

  4. Which command locks a user account so they cannot log in with a password?

    Answer: usermod -L username

    `usermod -L username` locks the account by prepending a '!' to the password hash in /etc/shadow.

  5. In the output of `ls -l`, what does the first character 'd' indicate?

    Answer: The item is a directory

    A 'd' as the first character of the permission string indicates the item is a directory.

  6. What is the numeric (octal) representation of permissions rwxr-xr-x?

    Answer: 755

    rwx=7, r-x=5, r-x=5 → 755.

  7. Which command shows failed login attempts on a Linux system?

    Answer: lastb

    `lastb` reads /var/log/btmp and displays a list of failed login attempts.