Linux Essentials 2.0 Chapter 15 Exam Answers

n n 0C ap er 1 5 Ex am A sw e LLiiinu in nux u ux xE Essse en nti ntttia ial alls 2 2...0 Ch ha p pttte er 15 xa am An n nsw wer ers rs s 11 Wh less con co us a 1. Whi hich icch ffiiles conta tain tain nu use serr ac acc cco cou oun unt n ntt iin inf nfo form orrrma ma mat at ati ti tio io ion on? on n? (c hoos ttwo (cho ch hoo ose se tw w wo o)) /etc/shadow /etc/group /etc/passwords /etc/passwd • • • • 22 hu us e 2. Whi hic iicch use ser err ca can can nv viiie ew th the the /etc/shadow fi fil iille? e? Any member of the password group No users The root user All users • • • • 3. Wh nd w illl di UIID, D GIID a an your Whi hi hic ich ch com omma ma an nd wil ill disp d spla lla lay ay y tthe th he eU ID D, GID and nd dg gro ro rou oup ups ups you ur gr yo cu on cur urr rre rent ntt u user err belong ngs gss tto to? o? whoami Who id about • • • • 44 u ser b ngs 4. Ea Eac ach ch h us user bel elo ello on ngs east st o one ne e gr gro rou ou oup up. p. be gs to to a at lea on Tr Tru ru rue ue e orr Fa Fal als lse sse e?? True False • • 55 c com comma ussers h ar n 5. Wh Whi hich icch ommand nd nd w wi wil illl di dis isp spl play ay tth the he eu errss ttha th hat att a are re e ccu cur urre rent ntl tly ly y llo log ogg gg gged ed d iin n p to o tth the e ssys yst ste tem e em m?? about who id whoami • • • • 66 6. The he sudo co com omm mma mand da allo low owss rre reg e eg gu gul ula lar arr u use sers rss tto to… o… u us …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. • • • • 7. Wh icch co mmand diiisssp p us Which ho off th the e fo o oll olllllow owi win ing comm nds ds wi wil illll d plla ayy tth the he eg gro grrou ro oup ou up( up p( p(s (s) ss)) a u user er ffol o be bel elo lon ongs gss tto to? o? all id whoami group • • • • 8. Wh o th fo n cco o w g Whi hic ich h of the he e ffol ollllo low owi wing in ng g com omm mma man ma an and nds d dss wil wiiill lll d displ di pla la ay y the e gro oups ou s tth tha hat att tth the he grrou us bob b n gs tto use ser err bob bel ello o on ngs ng o?? be group bob id bob groups -a all bob • • • • 99 ows wh sttruct uctu 9. The /etc/group fi fililile e fol foll llllows lo wha h ha a att str ru cttur ur ure re re? e? • • • • 10. group:GID:user_list groups -a user:group group_name:password_placehoder:GID:user_list A GID is associated with a group nam name. e. True or False? • • True False 11. A user can belong to… • • • • At least 16 groups Only five groups Only groups with a GID over 500 Only one group 12. Sudo privi privileges leges can be used to specify which user can use the sudo command to execute commands as other users. True or False? • • True False 13. In distri distributions butions that do not allow the root user to log login in directly or via the su command, the installation process automatically configures one user acc account ount to be able to use the sudo command to execute commands as if they were executed by the root user. True or False? • • True False 14. Which of the following commands will display ho how w long the system has been running since the la last st boot? (choose two) • • • • who id uptime w 15. The /etc/shadow file contains plain-text passwords. True or False? • • True False 16. Which command can be u used sed to view the /etc/passwd file entries? • • • • 17. uptime uppasswd getpasswd getent All Linux systems allow administrators to log in as rroot. oot. True or False? • • 18. • • True False What is the defaul defaultt user for the su co command? mmand? All users The root user • Any member of the password group • The most recently created user 19. Which command would allow a user to execute commands as root? whoami about sudo who grep • • • • • 20. File permissions cannot be edited by the root user. True or False? True False • • 21. Which command is used tto o display only the user’s primary group? who id -g man whoami about • • • • • 22. Tradi Traditional tional UNIX systems allowed users to belong to how many groups? 10,000 1 65,000 256 16 • • • • • 23. 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. • • • • • 24. Usernames cannot be th the e same as group names. True or False? True False • • 25. To display the group(s) a user belon belongs gs to use this command: all id grep group whoami • • • • • 26. Which command will display the groups that the root user belongs to? all -t groups -a id root all group -r • • • • • 27. A value of 0 in the “min “minimum” imum” password aging field means the user cannot cchang hang hange e their password. True or False? • True • 28. False The “Epoch” began on January 1, 1970. True or False? • • 29. • • • • • True False 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 30. Sudo privi privileges leges allow users to e execute xecute commands a ass another user. True or False? • • True False 31. 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 False 32. The first line of this command displays how long the system has been running since being reb rebooted. ooted. • • • • • su getent w id who 33. The /etc/shadow file contains encrypted passwords. True or False? • • True False 34. Which command can be u used sed to view the /var/log/wtmp file entries? • • • • • getent uptime getpasswd uppasswd last