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DTN611S - DATA NETWORKS - 1ST OPP - JUNE 2023 |
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nAm I Bl A un IVERS ITV
OF SCIEnCE Ano TECHnOLOGY
FACULTY OF COMPUTING AND INFORMATICS
DEPARTMENT OF COMPUTER SCIENCE
QUALIFICATION: BACHELOR OF COMPUTER SCIENCE, BACHELOR OF INFORMATICS
QUALIFICATION CODE: 07BACS, 07BAIF
LEVEL: 7
COURSE NAME: DATA NETWORKS
DATE: JUNE 2023
DURATION: 2 HOURS
COURSE CODE: DTN611S
PAPER: THEORY
MARKS: 70 {100%)
FIRST OPPORTUNITY EXAMINATION PAPER
EXAMINERS
MODERATOR
MS. ALBERTINA SHI LONGO, MS. JOVITA MATEUS, MR. PETER GALLERT, MS.
HELENA HAINANA, MS NDESHIHAFELA KAKWAMBI, MR. ERICKY IIPUMBU
MS. LOINI IIYAMBO
THIS QUESTION PAPERCONSISTSOF 6 PAGES(Including this front page)
INSTRUCTIONS
1. Answer ALL the questions on the answer scripts provided.
2. Write clearly and neatly.
3. Be guided by the number of marks allocated when answering the questions.
4. Show all your calculations.
5. Number your questions clearly.
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Question 1: Write down the question number and the correct answer next to it.
1. The _______
is a network device that connects multiple networks:
a) Server
b) Transmission Media
c) Switch
d) Router
[ 15 marks]
2. Which of the following correctly defines the function of the DNS on the network?
a) To assign IP addresses automatically to devices on the network.
b) To translate IP addresses into domain names and vice versa.
c) To act as an intermediary between clients and remote servers.
d) To host websites.
3. The method that enables the network administrators to tailor the subnet mask to their
specifications.
a) Subnetting
b) IP Addressing
c) Subnet masking
d) Routing
4. The protocol used for reporting network errors and performing network diagnostics.
a) Internet Protocol
b) Internet Control Message Protocol
c) Network Address Translation
d) Transmission Control Protocol
5. The layer that ensures correct encoding and decoding of incoming and outgoing data in the
network.
a) Physical
b) Presentation
c) Application
d) Data Link
6. In everyday life, a typical example of a client-server architecture is
a) Customers queueing at the till to wait for their items to be scanned in Shoprite
b) Patients waiting to be assisted by the dentist
c) Students registering for the 2021 academic year
d) All the above
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7. The dotted subnet mask for the network number 10.0.8.0/26 is:
a) 255.255.255.192
b) 255.255.192.255
c) 255.255.0.0
d) 255.0.0.0
8. The default prefix subnet mask for IP address 192.168.3.4 is:
a) /18
b) /17
c) /24
d) /8
9. _________
direct the correct segment to the correct application at the transport
layer.
10. The default TCP header size is --------
11. The ________
layer ensures reliable data transmission between adjacent devices
on the network
12. In HTTP, code 3XX indicates --------
13. The Transport layer takes data datagrams from the upper layers and breaks them into smaller
chunks called ---------
14. Routers are only used in Wide Area Networks.
a) True
b) False
15. Wireless transmission can be done via radio waves only.
a) True
b) False
16. A data transmission session must be terminated at the end of each packet sent.
a) True
b) False
17. Tim is accessing the NUSTwebserver from his home network. Maria, who is in a different town,
also connects to the NUST web server. Both Tim and Maria need to be physically connected to
the same DNS server before they can access the NUST web server ..
a) True
b) False
18. Data transmitted over the fiber optics is in the form of an electrical pulse
a) True
b) False
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19. End-user devices can only interact with one application layer at any given time.
a) True
b) False
20. TCP is an underlying protocol for SMTP
a) True
b) False
Question 2
[14 marks]
2.1 a newly established company recently hired Maria as an IT Technician; The company purchased 300
new computers for their employees. The IT manager asked Maria to configure the computers with
the necessary settings to enable these computers to connect to the company's network and the
Internet, respectively.
a) List four (4) main network settings that Maria needs to configure on the newly purchased
computers and explain the purpose of each setting.
(4)
b) Given the number of computers to be configured, which method of IP address assignment is
suitable and why?
(4)
c) A user received her newly configured computer from Maria and would like to tell the method
of IP address assignment. Explain how the user can go about this.
(2)
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Question 3
Use the figure below to answer the following questions.
!3~y;i'errexfcransfffi>rotoco.l____ _
i ~'Gffjigildesc:xrfaml P/fl\\~\\JL. - --
1 E:[Expe-rItnfo (chat/Sequencec):,n /igddescx. ml HTTP/1\\.1r\\n]
Reques~t ethodG: £T
RequesU-1R!:/igddesc.xal
Requesvtersion:HTI/!P. 1
cache-contronlo: -cache\\r\\n
coonecciocnl:ose\\r\\n
Prag : no-cac11e\\r\\n
Acceptt:ext/Xl11a, pplication/x:rnl'r\\n
Host: 192.168.178.1:49000\\r\\n
user-Agen~t:1icrosoft-•~ind-0lMUiP/6n.P/1D. \\r\\n
\\r\\n
r~ullreouestURI:htro://192.168.178.1:~9000/igddesc.xmll
[HTTrPequest1/1]
[Resfrnnsien fr~: 23]
[24 Marks]
3.1 Identify the following information.
a) The type of HTTPpacket in the figure.
(1)
b) The name oft.he document being requested.
(2)
c) The HTTPversion
(1)
d) Format of acceptable information
(1)
3.2 Explain the purpose of these methods in HTTP.
(3)
a) GET:
b) PUT:
c) POST:
3.3 HTTP runs on TCP services. Name any four (4) TCP attributes that make it a reliable protocol. (4)
3.4 You would like to access the NUST website on your computer using the domain name
(www.nust.na). In detail, outline the series of activities that will take place prior to this page being
delivered to your computer.
(8)
3.5 Explain two types of connections in HTTP.
(4)
3.6 Explain the functions of TCP and UDP when sending an e-mail
(4)
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Question 4
4.1 Consider the network topology below to answer the questions following.
[17 Marks]
192.168.11.1/26
AA:AA:AA:AA:AA:AA
/
TR4331
PeerO
o"'"~
172.16.55.1/21
1A:1A:1A:1A:1A:1A
=- -=----._J-"'
PC-PT
PCO
192.168.11.4/26
BB:BB:BB:BB:BB:BB
WORKSTATION A
Server-PT
ServerO
172.16.55.3/21
1 B:1 B:1 B:1 B:1 B:1 B
WORKSTATION B
a) Write down the_subnet mask for workstation A in a dotted notation. S~ow all your
calculations.
(4)
b) Calculate the network number of workstation A. Show your calculations.
(4)
c) Calculate the broadcast address for workstation A. Show your calculations.
(4)
d) Determine the last usable address for workstation A network.
(2)
e) Determine the number of usable addresses for workstation B network.
(3)
[Total marks: 70]
Paper ends
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