11. which of the following commands can be used to extract a tar file?
a. tar -vf
b. tar -xvf
c. tar -e
d. tar -v

12. which of the following commands can be used to create a tar archive file in verbose mode?
a. tar -v
b. tar -cvf
c. tar -c
d. tar -vf

13. in what file do you change default shell variables for all users?
a. /etc/bashrc
b. /etc/profile
c. ~/.bash_profile
d. /etc/skel/.bashrc
e. /etc/skel/.bash_profile

14. which two files in a user's home directory are used to customize the bash environment?
a. bash and .bashrc
b. bashrc and-bash_conf
c. bashrc and bashprofile
d. .bashrc and .bash_profile
e. bash.conf and .bash_profile

15. where are the default settings for the useradd command kept?
a. /etc/default/useradd
b. /etc/sysconfig/useradd.cfg
c. /etc/.useradd
d. /etc/defaults/useradd
e. /etc/login.defs

16. which protocol is used by ping?
a. tcp
b. udp
c. smb
d. icmp
e. ospf

17. if you suspect that a gateway machine on your network has failed but you are unsure which machine, which command will help locate the problem?
a. ps
b. netstat
c. nsloopup
d. ifconfig
e. traceroute