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CORK INSTITUTE OF TECHNOLOGY
INSTITIÚID TEICNEOLAÍOCHTA CHORCAÍ
Semester 1 Examinations 2012/
Module Title: System Administration 1
Module Code: COMP 7020 School: Mathematics & Computing
Programme Title: Bachelor of Science in Computing - Award Bachelor of Science (Honours) in IT Management Higher Certificate in Science in Computing in Information Technology Support – Year 2 Higher Certificate in science in Computing – Year 2
Programme Code: KCOMP_7_Y3KITMN_8_Y KITSU_6_Y KCOME_6_Y
External Examiner(s): Dr. Anthony Keane Internal Examiner(s): Mr. Gerard Mac Sweeney
Instructions: Answer 4 questions. All questions are worth equal marks
Duration: 2 Hours Sitting: Winter 2012
Requirements for this examination: Note to Candidates: received the correct examination. Please check the Programme Title and the Module Title to ensure that you have If in doubt please contact an Invigilator.
(a) What items of information are held in the passwd file? ( 6 Marks ) (b) Why are Linux passwords regarded as being secure? ( 3 Marks ) (c) With reference to passwords, what is a salt and what is its purpose? ( 4 Marks ) (d) What is a dictionary attack? ( 2 Marks ) (e) What are the characteristics of a good password? ( 3 Marks ) (f) How might an administrator disable a user’s account? ( 2 Marks ) (g) A user’s default directory is located at /home. How would you change it to a remote disk mounted at /media/remoteDisk? ( 3 Marks ) (h) Write down one advantage and one disadvantage of using Linux instead of Microsoft Windows. ( 2 Marks )
(a) Name the only Linux process not to have a parent. ( 1 Mark ) (b) Write down an example of an independent boot loader. ( 1 Mark ) (c) Where would you normally expect to find the bootloader? ( 2 Marks ) (d) What file would you edit to change the default run-level? ( 2 Marks ) (e) Why should you never change the default run-level to 0 or 6? ( 2 Marks ) (f) The following is the name of one of the files in a particular run-level lrwxrwxrwx... S18httpd -> ../init.d/httpd What type of file is it and what is the purpose of the S and 18 as part of the filename? ( 3 Marks )
(g) How might an administrator stop a service running permanently? ( 1 Mark ) (h) How might an administrator stop a service running temporarily? ( 1 Mark ) (i) What is the last program to run at the end of the boot sequence (just before the user logs on)? ( 1 Mark ) (j) What is the purpose of the Linux service at? ( 2 Marks ) (k) In Suse Linux, how would you know if the at service is running. ( 2 Marks ) (l) Name another service that performs a similar function to at. ( 2 Marks ) (m) In Linux, how would you stop a process? ( 3 Marks ) (n) Name the Linux protocol which can be used to synchronise computer clocks on a network. ( 2 Marks )
(a) Using octal notation, set the permissions for the file myFile to – rwxr-xr--. ( 3 Marks ) (b) How might an administrator allow two (or more) users to be able to copy files from each others’ home directories. ( 3 Marks ) (c) How could an ordinary user allow all other users to be able to copy files to his / her directory? ( 2 Marks ) (d) Write a script which prompts the administrator to create a new user, grants apassword and adds the user to the group myGroup. ( 6 Marks )
(e) How might an administrator remove many users at once? ( 2 Marks ) (f) Name three environmental variables. ( 3 Marks ) (g) If java compiler is located at /java/bin, how might a user access it without having to enter the full path every time? ( 2 Marks ) (h) In a typical Linux system, what type of files would you expect to find in thefollowing directories: /dev, /root/, /sbin and /lib? ( 4 Marks )
