Linux: Users and Groups

What is the name of the file in which details of user accounts are stored?

• /etc/uac

• /etc/accounts

• /etc/passwd

• /etc/shadow

What is the name of the file that stores salted/hashed versions of user passwords for authentication?

• /etc/uac

• /etc/passwd

• /etc/shadow

• /etc/.pws

What command can be used to change password policies such as minimum and maximum password age?

• usermod

• chage

• passwd

• pwd

Given the following entry in a the /etc/shadow file, what does the $6 tell you?

$6$CsSxcYg1Ll.....

• 6 days till password expiration

• 6 days since password last changed

• Sha-512 Hashing algorithm was used

• The password is 6 characters long

If you enter a command like the following, what does the ( -I 7 ) portion do?

sudo chage -m 1 -M 90 -W 7 -I 7 tatortot

• sets an inactivity grace period of 7 days before account is disabled

• sets the account as inactive after 7 failed login attempts

• remembers the last 7 logins

• logs out tatortot after 7 minutes of inactiviy

What is the default sudo command reprompt behavior; when will it ask you to enter your password when using sudo repeatedly?

• Trick question, it always does

• Only once per session

• every 5 minutes

• every 5 attempts

What file allows you to set defaults for account and password expiration for all newly created users?

• /etc/passwd

• /etc/login.defs

• /etc/usermods

• /etc/acct.defs

What term is used for groups that a user is a member of, but are not the users primary group?

• secondary groups

• tertiary groups

• additive groups

• supplementary groups

Match the following UID/s with the account/s that go with them.

• UID 1-200

• System Processes that don't own files on the system.

• UID 1000+

• System Accounts statically assigned to system processes

• UID 0

• root

• UID 201-999

• Regular users.

What does the following command do?

usermod -L tot

• Displays the last login time for user tot.

• Locks user tot's account out from logging in.

• Adds current user to the group tot.

• Lists user tot's supplementary groups.