ITST 305 NA

What is the main difference between the su and sudo commands in Linux?

• su changes the user's shell, sudo runs a command with temporary privileges

• su allows passwordless login, sudo does not

• sudo logs the user in as root, su does not

• su is only available in graphical environments

Which file stores encrypted user passwords in a modern Linux system?

• /etc/passwd

• /etc/users

• /etc/shadow

• /etc/login.defs

What is the purpose of the /etc/skel directory?

• It stores system-wide login logs

• It contains default configuration files for new user home directories

• It maintains kernel parameters

• It is used to store all encrypted passwords

What does the UID 0 represent in Linux systems?

• A system service

• An unprivileged user

• The root user

• A daemon process

Which command is used to safely edit /etc/passwd?

• nano /etc/passwd

• edit /etc/passwd

• vipw

• vi /etc/passwd

What does the command usermod -aG wheel user do?

• Adds the user to a system account

• Adds the user to the wheel group, enabling sudo access

• Removes the user from all groups

• Grants root access permanently

What happens when you use useradd -m?

• It disables the home directory

• It creates a user and skips setting a home directory

• It creates a user and also a home directory

• It sets a temporary user shell

Which field in /etc/shadow defines when a user must change their password?

• UID

• Encrypted password

• Days after which password must be changed

• Comment field

Which command sets the password for a user to expire in 90 days with a 3-day warning?

• chage -M 90 -W 3 user

• passwd -x 90 -w 3 user

• passwd -n 3 -x 90 user

• chage -x 90 -w 3 user

Where are the default values for useradd stored?

• /etc/shadow

• /etc/user.config

• /etc/login.defs and /etc/default/useradd

• /etc/default/shadow