Chapter 15
The "Epoch" began on January 1, 1970. True or False?
True
The sudo command allows regular users to... ...execute commands as another user. ...execute any command as root, after providing the root password. ...run any command as root, after providing the sudo password. ...run any commands as a system account without logging in.
...execute commands as another user.
A user can belong to... At least 16 groups Only five groups Only groups with a GID over 500 Only one group
At least 16 groups
The last command displays reboot records... By default Never Only when issued by the root user After restarting the system When issued with the -p switch
By default
A value of 0 in the "minimum" password aging field means the user cannot change their password. True or False?
False
All Linux systems allow administrators to log in as root. True or False?
False
File permissions cannot be edited by the root user. True or False?
False
Which command can be used to view the /var/log/wtmp file entries? getent uptime getpasswd uppasswd last
Last
What would an account with the UID 376 typically be used for? White hat hackers. Temporary employees. New users with full privileges. System service access. Root user access.
System service access.
What is the default user for the su command? All users The root user Any member of the password group The most recently created user
The root user
Which user can view the /etc/shadow file? Any member of the password group No users The root user All users
The root user
A GID is associated with a group name. True or False?
True
Each user belongs to at least one group. True or False?
True
In distributions that do not allow the root user to login directly or via the su command, the installation process automatically configures one user account to be able to use the sudo command to execute commands as if they were executed by the root user. True or False?
True
Sudo privileges allow users to execute commands as another user. True or False?
True
Sudo privileges can be used to specify which user can use the sudo command to execute commands as other users. True or False?
True
The /etc/shadow file contains encrypted passwords. True or False?
True
When using the sudo command to execute a command as the root user, the command prompts for the user's own password, not that of the root user. True or False?
True
Which command can be used to view the /etc/passwd file entries? uptime uppasswd getpasswd getent
getent
The /etc/group file follows what structure? group:GID:user_list groups -a user:group group_name:password_placehoder:GID:user_list
group_name:password_placehoder:GID:user_list
To display the group(s) a user belongs to use this command: all id grep group whoami
id
Which command will display the UID, GID and groups your current user belongs to? whoami Who id about
id
Which of the following commands will display the group(s) a user belongs to? all id whoami group
id
Which command is used to display only the user's primary group? who id -g man whoami about
id -g
Which of the following commands will display the groups that the user bob belongs to? group bob id bob groups -a all bob
id bob
Which command will display the groups that the root user belongs to? all -t groups -a id root all group -r
id root
Which command would allow a user to execute commands as root? whoami about sudo who grep
sudo
Which of the following commands will display how long the system has been running since the last boot? (choose two) who id uptime w
uptime w
The first line of this command displays how long the system has been running since being rebooted. su getent w id who
w
Which command will display the users that are currently logged in to the system? about who id whoami
who
Which files contain user account information? (choose two) /etc/shadow /etc/group /etc/passwords /etc/passwd
/etc/shadow /etc/passwd
Traditional UNIX systems allowed users to belong to how many groups? 10,000 1 65,000 256 16
16
The /etc/shadow file contains plain-text passwords. True or False?
False
Usernames cannot be the same as group names. True or False?
False
