 |
IWT711S - INTERNET AND WAN TELECOMMUNICATIONS - 2ND OPP - JULY 2025 |
|
|
1 Page 1 |
▲back to top |
nAmlBIA UnlVERSITY
OF SCIEn CE Ano TECHn OLOGY
Faculty of Computing and Informatics
Department of Computer Science
QUALIFICATION:Bachelor of Computer Science in Cyber Security
QUALIFICATIONCODE: 07BCCS
LEVEL: 7
COURSE: Internet and WAN Telecommunications
COURSECODE: IWT711S
DATE:July 2025
SESSION: 2
DURATION: 2 hours
MARKS: 70
SECONDOPPORTUNITY/ SUPPLEMENTARYEXAMINATION QUESTION PAPER
EXAMINER(S):
Mr. Nasimane Ekandjo
MODERATOR:
Mr.KudakwasheMadzima
THIS QUESTION PAPERCONSISTSOF 5 PAGES
(Excluding this front page)
INSTRUCTIONS
1. Answer ALL the questions.
2. Write clearly and neatly.
3. Number the answers clearly.
4. When answering questions you should be guided by the allocation of
marks. Do not give too few or too many facts in your answers.
PERMISSIBLEMATERIALS
1. None
|
|
2 Page 2 |
▲back to top |
Section A [12 marks]
Question 1
For the following questions, answer True/False.
[6]
1.1 Inside global - the actual address assigned to an inside host (private address).
1.2 192.192.0.1 is an example of a public IP Address.
1.3 TTL propagation can be disabled to hide the MPLS network topology.
1.4 With unguided media, the antenna is considered more important in terms of the bandwidth
produced.
1.5 Radio waves are converted to an electrical signal to produce sound.
1.6 Outside Local NAT address is an IP address used to translate an outside private IP address.
Question 2
Choose the correct answer from the multiple-choice questions below.
[6]
2.1 In the transmission of terrestrial microwaves
antenna.
can regenerate the signal at each
a) repeaters
b) bridges
c) routers
d) any of the above
2.2 Which two DHCPpacket types contain an IP address to be leased to a client?
a) Offer and Release
b) Offer and NAK
c) Offer and Acknowledgement
d) Offer and Renew
Page 1 of 5
|
|
3 Page 3 |
▲back to top |
2.3 ___
is an analog multiplexing technique usually involving signals in the visible light
frequencies.
a) FOM
b) TOM
c) WOM
d) MOM
2.4 In TDM, slots are further divided into __ _
a) seconds
b) bits
c) packets
d) frames
2.5 In the ___ transmission mode, each station can transmit, but not at the same time.
a) simplex
b) half-duplex
c) full-duplex
d) both b) and c)
2.6 Which of the following is usually not classified as a guided medium?
a) Twisted-pair cable
b) Coaxial cable
c) Fiber-optic cable
d) None of the above
Page 2 of 5
|
|
4 Page 4 |
▲back to top |
Section B [58 marks]
Question 3
Explain the following concepts as used in internet and WAN telecommunications:
3.1 Half-duplex
[2]
3.2 Crosstalk
[2]
Question 4
4.1 The maximum rate at which data can be transmitted over a given communication path, or
channel, under given conditions, is referred to as the channel capacity. Mention four factors
that affect channel capacity.
[4]
4.2 What the three causes signal degradation and bit errors between signal received and signal
transmitted?
[3]
Question 5
5.1 Explain why you would prefer to utilise ADSL rather than cable modem for internet
connectivity?
[3]
5.2 What type of multiplexing method does ADSLutilises?
[1]
5.3 What is the distance range does ADSLscheme provides?
[1]
Question 6
6.1 Explain how Stateless Address Autoconfiguration works in 1Pv6.
[3]
6.2 1Pv4uses Address Resolution Protocol (ARP).What 1Pv6protocol replaces ARP?
[2]
Question 7
Consider the figure below regrading VPN configuration and answer the questions that follows:
Line 1
Line 2
Line 3
Line 4
Line 5
Line 6
Rl(config)# crypto
Rl(config-isakmp)#
Rl(config-isaJanp}#
Rl(config-isaJanp)#
Rl(config-isakmp)#
Rl(config)# crypto
isakmp policy 10
encryption aes
authentication
pre-share
group 2
exit
isakmp key cisco address
10.2.2.2
Page 3 ofS
|
|
5 Page 5 |
▲back to top |
7.1 What is the purpose the configuration in line 2?
[1]
7.2 What is the purpose the configuration in line 4?
[2]
7.3 What is the purpose the configuration in line 6?
[2]
7.4 Explain two advantages and two disadvantages of utilising a VPN in a network.
[4]
7.5 What is tunneling in VPN?
[2]
Question 8
8.1 Explain four benefits of utilising frame relay.
[4]
8.2 What are DLClsas used in Frame Relay?
[2]
8.3 Distinguish between Permanent Virtual Circuits (PVCs)and Switched Virtual Circuits (SVCs).
[2]
Question 9
As a Network Administrator, you can either make use of a twisted pair, coaxial or fiber optic cables
as a means of data transmission medium.
9.1 Describe the physical construction characteristics of twisted pair cables in comparison to
coaxial cables.
[4]
9.2 In terms of distance and data rate, differentiate between twisted pair and fiber optic cables.
[4]
Page4 of 5
|
|
6 Page 6 |
▲back to top |
Question 10
Consider the figure below and answer the questions that follow:
PC_1
10.0.37.205
Internet
2911
RouterO
L--./lJ.
PC-PT
PC_2
192.168. 95.108
Inside: 172.16.16.1
Ouside: 64.100.50.1
Server-PT
Server_ 1
10.1 Write down the full command that will create a static NAT translation to map the Server_l
inside address to its outside address.
[3]
10.2 Mention any other method that can be used to configure NAT.
[1]
10.3 Write down the commands that will configure the correct inside and outside interfaces on
the router. Write separate commands for each of the two interfaces.
[4]
10.4 Write down the command that you can issue on the router to verify the static NAT
configurations.
[2]
End of Paper
Page 5 of 5