5.1 Security - Basic Security and Identifying User Types

Question 1

What information is stored in /etc/passwd?

A) Username, information about a user’s password, user ID, group ID, user ID info, home directory, command/shell

B) Username, information about a user’s password, user ID, group ID, secondary group membership, home directory, command/shell

C) Username, information about a user’s password, user ID, group ID, last password change, home directory, command/shell

D) Username, information about a user’s password, user ID, group ID, number of days before password is to expire, home directory, command/shell

Answer 1

Username, information about a user’s password, user ID, group ID, user ID info, home directory, command/shell

Question 2

What commands could you use to show the group membership of cloud_user? (Pick 3)

A) groups cloud_user

B) id cloud_user

C) cat /etc/groups | grep cloud_user

D) cat /etc/group | grep cloud_user

Answer 2

cat /etc/group | grep cloud_user

id cloud_user

groups cloud_user

Question 3

System users normally __. (Pick 3)

A) Have a default password set
B) Do not have an interactive login shell
C) Have a lower UID than standard users
D) don’t have a home directory

Answer 3

don’t have a home directory

Have a lower UID than standard users

Do not have an interactive login shell

Question 4

The /etc/shadow is readable by whom and what information is stored?

Answer 4

/etc/shadow file is readable only by root and users with root privileges and contains the encrypted passwords of the users, each on a separate line

• Username
• Encrypted password
• Date of last password change
• Minimum password age
• Maximum password age
• Password warning period
• Password inactivity period
• Account expiration date
• A reserved field

Question 5

What utility can you preface a command with to execute with elevated privileges?

A) su -
B) su-do
C) sudo
D) exec

Answer 5

sudo