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SAD622S - SYSTEMS ADMINISTRATION - 2ND OPP - JAN 2020 |
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1D
NAMIBIA UNIVERSITY
OF SCIENCE AND TECHNOLOGY
FACULTY OF COMPUTING AND INFORMATICS
DEPARTMENT OF COMPUTER SCIENCE
QUALIFICATION:
BACHELOR OF COMPUTER SCIENCE
QUALIFICATION CODE: O7BACS
COURSE: SYSTEMS ADMINISTRATION
DATE: JANUARY 2020
DURATION: 2 HOURS
LEVEL: 6
COURSE CODE: SAD622S
SESSION: 2
MARKS: 50
SECOND OPPORTUNITY / SUPPLEMENTARY EXAMINATION QUESTION PAPER
EXAMINER(S)
SHADRECK CHITAURO, SHOOPALA NAMBAHU, EDWARD NEPOLO, TERESIA ANKOME
MODERATOR:
ISAAC NHAMU
THIS QUESTION PAPER CONSISTS OF 4 PAGES
(Excluding this front page)
INSTRUCTIONS
Answer all questions.
Write all your answers in the answer booklet provided and number every question.
Please, ensure that your writing is legible, neat and presentable.
Marks/scores per question are given in square brackets [ ].
Do not use or bring into the examination venue books, programmable calculators, mobile
devices and other material that may provide you with unfair advantage. Should you be in
possession of one right now, draw the attention of the examination officer or invigilator.
6. All things that should not be marked, e.g. any “rough work”, have to be crossed out
unambiguously.
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1. True or False
[10]
(a) RAID level 5: - Includes striping, error correction and checksum verification, and all
are spread across all of the disks.
(b) A domain is a logical grouping of network objects such as user, computers and
network devices.
(c) The windows command nslookup can be used to test DNS functionalities.
(d) Bind-chroot is used to increase security in Linux DNS.
(e) To append text from a given file to an existing file we use the symbol >
(f) The command dir in windows is the same as Is in Linux.
(g) The & is used to resume background jobs in Linux.
(h) Windows scheduled tasks are called cron jobs in Linux.
(i) Command net user is used to check if an account is disabled or not.
(j) Packages with extension .msi can be displayed using GPO.
2. Short Questions
(a) You are employed as the Systems Administrator for Contoso Enterprise. One day you
decide to create Group Policies on the local machine and on the Organisational Unit
level. After you refresh your group policies you discovered that the policies you
applied on the Organisational Unit level were not applied. Explain why the system is
behaving this way.
[2]
(b) What is meant by lockout policy and password history in Windows?
[2]
(c) Give a clear distinction between a DNS recursive lookup process and iterative
lookup process.
[2]
(d) What do you understand by group policy object?
[2]
(e) What do you understand by incremental backup? State one advantage of
incremental backup.
[2]
(f) In systems administration, APT is an acronym for?
[1]
(g) What do you understand by task-based delegation in Active Directory?
[2]
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(h) With reference to the activities labeled A in the migration activities in figure 1
below, what is prototyping and why is it used?
[2]
Legacy
System
Baselines
New
System
Baseline
Figure 1
3: Long Questions
(a) Analyse figure 2 and answer the questions which follows. Figure 2 is a screen shot
from a Windows 10 Client machine.
Coe Administrator: C\\Windows\\system32\\cmd.exe - nslookup <
mC >\\Users\\Administratolro>oknusp
a
mDefault Server: station254.example.con
=
eS
19.188.54.254
Pane)
BServer:s
Address:
station254.example.com
16.180.54.254
\\Etuas
web.exanple.con
ddresses: 18.160.54.261
19.186.54.262
16.1868.54.268
as et q=mx
>e xample.com
oy vers station254.example.con
dd ress: 16.180.54.254
me Xa nple.con
ebatsl nple.con
Das -example.com
eeu -example.com
Dis
MR preference = 10, mail exchanger = prt.example.con
MR preference = 9, mail exchanger = txr.example.con
internet address = 19.100.54.58
internet address = 18.1860.54.51
Figure 2
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(i) Using information shown in figure 2, what is the fully qualified domain name of the
primary DNS server for this client machine.
[1]
(ii) How many email servers are responding to example.com domain? List their fully
qualified domain names and corresponding IPs
[2]
(iii) You have been hired as a consultant to troubleshoot problems existing at Example cc.
They told you that emails are being delivered to one server and yet they want all emails
to be delivered to all available mail servers. What will be your solution to solve this
problem? Use only information from figure 2.
[3]
(iv) Assuming users can access the website for example cc by typing web.example.com.
which server will respond when users type web.example.com and why? [Hint: there are
3 addresses for the same url]
[2]
(b) As an administrator, you can administer active directory running a server 2012 core
edition using the command prompt. Identify the error in the following command for
adding a user to a domain controller active directory and users.
[2]
net user jack /add /domain
(c) You created a user on a domain controller using the following command:
dsadd user “cn=sad,cn=users,dc=cs,dc=net" -In Sad622S -fn Saduser
After creating the account, you discovered that the account sad cannot logon to
your domain controller and gives an error message “account disabled. Contact your
administrator’. From the command used, why would the account be disabled?
[2]
4. Unix Commands
Write down the commands to perform the following:
(i)
Check all group membership(s) for the user sad.
[1]
(ii)
List all processes running.
[1]
(iii) Change the expiry date of an existing user john to 20 December 2019. — [2]
(iv) Display a list of all shells installed on your machine.
[1]
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5. Scripting
(a) Give the result of expr 17+ 7/3.
[2]
(a) Write a script that prompts the user for a filename and then changes the
permissionsto: -fWXIr-XIr--
[3]
(b) The script below will not run correctly due to some syntax errors. Identify these
errors.
[3]
echo “Enter the values of num1, num2 and num3”
read num1 num2 num3
num4="expr Snum1 \\+ Snum2 \\+ Snum3°
product="expr Snum1 * Snum2 * Snum3°
echo “The sum of the three numbers is num4”
echo “The product of the three numbers is product”
End of Question Paper