INFT1012 Network Fundamentals
INFT 1012 Network Fundamentals Deferred Exam Page 1 of 20
INFT1012 Network Fundamentals
Deferred Exam
Time Allowed
Examination time: 120 Minutes
Reading time: 10 minutes
Total time: 130 Minutes
Instructions
You will have 10 minutes to read the paper. In this time you may make notes on the scribble paper
provided but you may not write on the answer paper until instructed to do so by the invigilator.
The examination time listed above includes all additional time given to international students and
students from culturally and linguistically diverse backgrounds.
All answers are to be completed in the answer booklet provided.
There are two parts to the examination paper.
Part A 58 Marks
Part B 42 Marks
The exam is worth 30 % of the total course.
Students may not provide their own dictionaries – English dictionaries are available in
the exam room
Please hand up the examination paper, scribble paper, your sheet of handwritten notes
and any other materials at the end of the exam.
Special additional information
This exam is part open book. 1 x A4 double sided handwritten notes is permitted.
No electronic aids are permitted e.g. laptops, phones, calculexaators.
Answer all parts of all questions
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Part A – Multiple Choice Questions
This part contains 29 multiple choice questions. Choose the best answer for each question and enter it into the
table at the top of the page. Each question only has one correct answer. Each question is worth 2 marks, and no
marks are deducted for incorrect answers. In total, Part A is worth 58 marks.
Question A1 A2 A3 A4
Your Answer
Question A1
What characteristic of a network enables it to quickly grow to support new users and applications without
impacting the performance of the service being delivered to existing users?
A. Reliability
B. Scalability
C. Quality of service
D. Accessibility
Question A2
A medium-sized business is researching available options for connecting to the Internet. The company is
looking for a high speed option with dedicated, symmetric access. Which connection type should the company
choose?
A. DSL
B. Dialup
C. Satellite
D. Leased line
E. Cable modem
Question A3
Which of the following is a benefit of using a layered network model?
A. It speeds up packet delivery.
B. It prevents designers from creating their own model.
C. It prevents technology in one layer from affecting other layers.
D. It ensures a device at one layer can function at the next higher layer.
Question A4
A network technician is attempting to configure an interface of a Cisco router by entering the
following command: SanJose(config)# ip address 192.168.2.1 255.255.255.0
The command is rejected by the device. What is the reason for this?
A. The command is being entered from the wrong mode of operation.
B. The command syntax is wrong.
C. The subnet mask information is incorrect.
D. The interface is shutdown and must be enabled before the switch will accept the IP address.
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Question A5 A6 A7 A8
Your Answer
Question A5
Refer to the diagram below. A network administrator is configuring access control to switch SW1. If the
administrator uses a console connection to connect to the switch, which password is needed to access user EXEC
mode?
A) letmein
B) secretin
C) lineconin
D) linevtyin
Question A6
Which of the following Ethernet cables is supposed to be used to connect a PC to a switch?
A) Crossover
B) Straight-through
C) Rollover
D) Coaxial
Question A7
What unique address is embedded in an Ethernet NIC and used for communication on an Ethernet network?
A) Host address
B) IP address
C) MAC Address
D) Network address
Question A8
What is the device used to connect two or more LANs?
A) Hub
B) Server
C) Router
D) LAN switch
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Question A9 A10 A11
Your Answer
Question A9
Which statement describes the media access control methods that are used by the networks in the diagram below?
(Note: In Network 1 the device which connects the PC and the router is a hub)
A) All three networks use CSMA/CA.
B) None of the networks require media access control.
C) Network 1 uses CSMA/CD and Network 3 uses CSMA/CA.
D) Network 1 uses CSMA/CA and Network 2 uses CSMA/CD.
Question A10
What will a host on an Ethernet network do if it receives a frame with a destination MAC address that does not
match its own MAC address and the destination MAC address is not the broadcast address?
A) It will discard the frame.
B) It will forward the frame to the next host.
C) It will remove the frame from the media.
D) It will strip off the data-link frame to check the destination IP address.
Question A11
Which frame forwarding method receives the entire frame and performs a CRC check to detect errors
before forwarding the frame?
A) Cut-through
B) Store-and-forward
C) Fast-forward
D) Fragment-free
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Question A12 A13 A14
Your Answer
Question A12
Refer to the diagram below. If host A sends an IP packet to host B, what will the destination address be in the
frame when it leaves host A?
A) DD:DD:DD:DD:DD:DD
B) 172.168.10.99
C) CC:CC:CC:CC:CC:CC
D) 172.168.10.65
E) BB:BB:BB:BB:BB:BB
F) AA:AA:AA:AA:AA:AA
Question A13
When an IPv4 host is to send a message to another host in the same LAN, which protocol is used by the sending
host to find out the destination host’s MAC address?
A) DHCP
B) ARP
C) ICMP
D) PING
Question A14
What is the dotted decimal representation of the IPv4 address 11001011.00000000.01110001.11010011?
A) 192.0.2.199
B) 198.51.100.201
C) 203.0.113.211
D) 209.165.201.223
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Question A15 A16 A17 A18
Your Answer
Question A15
At a minimum, which address is required on IPv6-enabled interfaces?
A) link-local
B) unique local
C) site local
D) global unicast
Question A16
A site administrator has been told that a particular network at the site must accommodate 126 hosts. Which
subnet mask would be used that contains the required number of host bits?
A) 255.255.255.192
B) 255.255.255.128
C) 255.255.255.224
D) 255.255.255.240
Question A17
Refer to the diagram below. What would be the default gateway address for host A in the 192.133.219.0
network?
A) 192.135.250.1
B) 192.31.7.1
C) 192.133.219.0
D) 192.133.219.1
Question A18
What is the automated service that matches URLs with the required IP address?
A) HTTP
B) SSH
C) DNS
D) SMTP
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Question A19 A20 A21 A22
Your Answer
Question A19
The diagram below shows the (partial) routing table of a router. Based on the information, when the router
receives a packets with a destination of 172.17.10.15, which router interface will the packet be forwarded
through?
A) FastEthernet0/0
B) FastEthernet0/1
C) FastEthernet1/0
D) FastEthernet1/1
Question A20
What mechanism is used by TCP to assure that application layer data is received in order?
A) Sequence numbers
B) Session establishment
C) Window size
D) Acknowledgments
Question A21
Which of the following does TCP, but not UDP, use?
A) Checksum
B) Acknowledgements
C) Source port number
D) Destination port number
Question A22
At University A, the system administrators wish to simplify the network configurations for PCs in the
computer pool, such that system administrators do not need to configure the IP addresses for each individual
PC manually. Which of the following protocols facilitates this feature?
A) DHCP
B) Subnetting
C) Cloud Computing
D) DNS
E) ARP
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Question A23 A24 A25 A26
Your Answer
Question A23
A) Given the subnet 10.5.12.0/24, which of the following IP address is a valid host address residing within the
network?
B) 10.5.12.255
C) 10.5.12.253
D) 10.5.13.0
E) 10.5.16.12
Question A24
Which of the following communication protocol is not used by Email applications?
A) SMTP
B) POP3
C) ICMP
D) MIME
Question A25
Which of the following statement about DoS attack is correct?
A) A web server being flooded with SYN requests and thus stopping responding is an example
of DoS attacks.
B) Encryption is an effective method to prevent DoS attacks
C) Firewall is not useful for preventing DoS attacks
D) DoS attacks can be easily eliminated.
Question A26
What is one difference between the client-server and peer-to-peer network models?
A) Only in the client-server model can file transfers occur.
B) Every device in a peer-to-peer network can function as a client or a server.
C) A peer-to-peer network transfers data faster than a transfer using a client-server network.
D) A data transfer that uses a device serving in a client role requires that a dedicated server be
present.
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Question A27 A28 A29
Your Answer
Question A27
What is a characteristic of a fault tolerant network?
A) A network that protects confidential information from unauthorized access
B) A network that can expand quickly to support new users and applications without
impacting the performance of the service delivered to existing users
C) A network that supports a mechanism for managing congestion and ensuring reliable
delivery of content to all users
D) A network that recovers quickly when a failure occurs and depends on redundancy to limit
the impact of a failure
Question A28
When planning for network growth, where in the network should packet captures take place to assess network
traffic?
A) On as many different network segments as possible
B) Only at the edge of the network
C) Between hosts and the default gateway
D) Only on the busiest network segment
Question A29
A company is expanding its business to other countries. All branch offices must remain connected to corporate
headquarters at all times. Which network technology is required to support this requirement?
A) LAN
B) MAN
C) WAN
D) WLAN
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Part B – Short Answer Questions
This part contains 6 short answer questions. Marks are shown next to each question. In total Part
B is worth 42 Marks.
Question B1 [10 marks]
Refer to the diagram below. Assume that PC-1 needs to communicate with the Web-Sever to
request a webpage from the server. PC-1 has its TCP/IP stack installed and running.
a) Provide the information in the table below about the names of PC-1’s TCP/IP layers, the
name of the PDU at the specific layer, and an example of the protocols involved in the layer
for PC-1 to request the webpage from the Web-Server. As an example, information about the
Network Access layer has been given in the table. (5 marks)
Layer Name Name of PDU of the
layer
Name of an example
protocol involved
Network Access
(specifically data link
layer)
Frame Ethernet
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b) Describe how the encapsulations are done at PC-1 at different TCP/IP layers to send the
message for requesting the webpage from the Web-Server. (5 marks)
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Question B2 [6 marks]
Fill in the table below by giving the full name of each protocol and highlighting the main
purpose of each protocol.
Acronym
of protocol
Full name of protocol Main purpose of protocol
FTP
TCP
HTTP
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Question B3 [7 marks]
Please complete the following tables with respect to the information about each of the given IP
addresses and its subnet mask.
Table 1: (4 marks)
IP Address 10.0.0.1/24
Subnet mask:
Network address: 10.0.0.255
Broadcast address:
First usable host address:
Last usable host address
Table 2: (3 marks)
IP Address 20.251.173.211
Network mask: 255.255.255.224
Network address:
Broadcast address:
Total number of usable host addresses in
this network:
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Question B4 [6 marks]
A network administrator has configured the network as shown above. The network is not
functioning correctly and he believes there are errors with the IP addressing scheme. List 3
errors in the network and suggest what could be changed to correct the problem in each case.
Error Suggested change
10.1.3.3/24
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Question B5 [5 marks]
Refer to the diagram below. The four PCs, A, B, C, and D are connected to ports 1, 2, 3, and 4
of the switch respectively. The hypothetical MAC address of a PC is shown beneath the PC.
(a) Assume that the switch’s MAC Address Table only contains one entry as shown below. If
PC A sends a frame to PC D, to which port(s) will the switch forward the frame? Justify
your answer. (3 marks)
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(b) Now assume that the MAC Address Table of the switch has been updated to contain two
entries as shown below. If PC A now sends a frame to PC D, to which port(s) will the switch
forward the frame? Justify your answer. (2 marks)
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Question B6 [8 marks]
Given below is the output from the show ip route command of a router (i.e. R1) in the network.
The router has two interfaces: G0/0 and G0/1.
In the space provided on the next page, draw a logical diagram of the network including:
1. the devices, assuming that each subnet only contains one switch and one PC. Use the
graphical device symbols adopted in this course. (2 marks)
2. cabling, and the names of R1’s interfaces to which the cables are connected. (You can
use the abbreviated interface name, e.g. G0/0 instead of the full name
GigabitEthernet0/0) (1 mark)
3. IP addressing information, including:
Network address of each subnet, and the subnet mask of the network address using the
slash notation (2 marks)
Address of each router interface and its subnet mask using the slash notation. (1 mark)
IP addresses of the two PCs. Assign the 3rd usable host address in each subnet to the PC
in the subnet. (2 mark)
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Spare Page
Notes:
1. These spare pages can be used as scratch paper for working out your answers to the exam
questions, but only answers written in the given spaces next to the exam questions will be
accepted and marked. No answers written on any of the spare pages will be marked.
2. These spare pages cannot be torn off the exam booklet.
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Spare Page