5.1 Basic Security and Identifying User Types (weight: 2) LINUX-ESSENTIALS Practice Questions (Page 1)

Questions 1–5

1. 1foundation · easy

   Which of the following is a special privilege of the root user in Linux?

   • AReading any file on the system regardless of permissions
   • BCreating new user accounts without using commands
   • CAccessing the internet without a firewall
   • DAutomatically backing up all files daily
   Reveal Solution Discussion Select an answer first
2. 2expert · hard

   A junior admin accidentally ran `chmod -R 777 /` as root, changing permissions on the entire filesystem. What is the most important immediate concern, and what should be done first?

   • AThe root user will lose access to the system.
   • BThe system will run faster because all files are now accessible.
   • CThe system is now insecure because many files are world-writable; restore permissions from a backup or reinstall the affected system packages.
   • DThe system will automatically revert the changes after a reboot.
   Reveal Solution Discussion Select an answer first
4. 3application · medium

   A company policy states that administrators must perform daily tasks with a regular user account and only elevate privileges when necessary. Which practice best follows this policy?

   • ACreate a second regular user with a UID of 0 for administrative work.
   • BLog in as a regular user and use sudo for individual administrative commands.
   • CLog in directly as root for all tasks to avoid permission errors.
   • DUse su to switch to root once at the start of the day and stay in that shell.
   Reveal Solution Discussion Select an answer first
5. 4application · medium

   An admin needs to run a script that requires root privileges, but the script must run in the background and the admin wants to log out of the SSH session afterward. Which approach is most appropriate?

   • ALog in as root directly and run the script.
   • BUse su to switch to root and run the script in the foreground.
   • CRun the script with sudo and close the terminal immediately.
   • DUse sudo to run the script with nohup so it continues after logout.
   Reveal Solution Discussion Select an answer first
6. 5application · medium

   An admin is reviewing /etc/passwd and sees the following entries: `root:x:0:0:root:/root:/bin/bash`, `sshd:x:104:65534::/run/sshd:/usr/sbin/nologin`, and `jane:x:1001:1001:Jane:/home/jane:/bin/bash`. Which statement correctly identifies the user types?

   • Aroot and sshd are system users, and jane is a regular user.
   • BAll three are system users.
   • Croot is the superuser, sshd is a system user, and jane is a regular user.
   • Droot is a regular user, sshd is a system user, and jane is a superuser.
   Reveal Solution Discussion Select an answer first