COIT20261 Network Routing: Address Usage, Subnet Allocation & Tools

This assignment solution for COIT20261 Network Routing and Switching covers key concepts including address usage, subnet allocation, and network tools. It provides detailed answers to questions on classless address blocks, subnet creation, and the application of tools like Wireshark, Netstat, and Tracert. The solution includes calculations for network addresses, broadcast addresses, and host IP ranges, along with explanations of subnet masks and CIDR notation. Furthermore, it analyzes Wireshark packet captures, interprets Netstat output, and discusses the information provided by Tracert, offering insights into network troubleshooting and security. This resource is valuable for students seeking to understand and apply fundamental networking principles. Desklib provides a platform to access this and other solved assignments and past papers.

COIT20261 Network Routing and Switching (Term 1, 2018)
Assignment item —Written Assessment-1
Due date: 11:45pm AEST, Friday, Week 6 ASSESSMENT
Weighting: 15% 1
Objectives
This assessment task requires you to demonstrate your knowledge of basic routing concepts
by completing a number of exercise questions. The questions contain numerical as well as
descriptive questions covering the material up to Week 6.
The questions are designed to help you to achieve the unit learning outcomes as listed in the
unit profile.
Instructions
You must do this assignment on your own – it is not a group assignment.
Type all your answers in the ‘Template for Your Answers’ Section of this document and
upload only that template. You could do that by copying the Template section into a new
Word document for uploading. Answers that are not typed into the “Template for Your
Answers” section may not be marked, or may be returned to you for re-typing and re-
submission – late penalties will apply.
Where instructed, you must show the steps you took to arrive at your answers. Write
your answers in your own words to avoid potential plagiarism and copyright violations.
You must submit the Answer section as a Word file (.doc or .docx). Do not submit PDF’s
or any other type of file without express permission from the Unit Coordinator.
Plagiarism Procedures can be found in the CQUniversity Policies section of the Unit Profile.
Assessment Requirements and Marking Criteria
There are 3 main questions with some sub-questions and the requirements are stated for each
one. You must answer all questions and their sub-questions. Marks are indicated in the
Answer Template.
The questions will be marked on correctness, logic and clarity, and addressing all parts of the
question.
The Assignment Questions begin on the next page.
USE THE PROVIDED TEMPLATE ON P.4 FOR ALL YOUR ANSWERS.

COIT20261 Network Routing and Switching (Term 1, 2018)
Assignment item —Written Assessment-1
Question 1 – Address usage (3 marks)
Consider the following classless address block:
154.78.177.3/27
List the addresses from this block that would be used as:
a) the network address,
b) the direct broadcast address, and
c) the range available for hosts to use
Show the steps you took to arrive at your answers.
Question 2– Allocating subnets from a block (8 marks)
A company has been granted a block of addresses which includes the address
138.77.216.5/24. Answer the following questions, showing your calculations.
a) Calculate the network address of this block and how many host addresses
including special addresses this block can provide (1 mark)
b) Create the following 6 subnets for this company by calculating the subnet
address for each subnet. Answer this question by filling in the table in the
Answer template. Use CIDR format for the mask.
I. 2 subnets with 32 addresses each (2 marks)
II. 4 subnets with 16 addresses each (4 marks)
c) After some time, the company decides that it wants another subnet with 1,024
addresses. Explain whether this can be allocated from the existing block.
(1 mark)
Question 3 – Network Tools (Windows) (4 marks)
Often the best way to gain an initial familiarity with network tools is to simply use them, at a
basic level in exploratory mode as suggested in some of the tutorial exercises. Netstat and
Tracert are included in Windows, while Wireshark is free to download and install. Explore
Wireshark, Netstat and Tracert, then complete this question.
a) A wireshark scan has produced a packet capture, saved to a file named
wireshark_capture01.pcapng and available on the Unit website. Download the file
and open it in Wireshark, then answer these questions about the scan:
i. Very briefly summarise in your own words the content in each of the three
horizontal display windows in Wireshark (.5 mark)
ii. In Frame 3, what brand of computer launched this scan and what was its IP
address? State where this information is found (.5 mark)
iii. Briefly explain the exchange event captured in frames 4 - 6 (.5 mark)

COIT20261 Network Routing and Switching (Term 1, 2018)
Assignment item —Written Assessment-1
iv. Describe in your own words two specific network problems that a network
administrator could use Wireshark for as a troubleshooting tool? (.5 mark)
b) A ‘NETSTAT –aon’ command has given the output below (excerpted). Briefly
describe each column heading, and the states LISTENING, ESTABLISHED and
CLOSE_WAIT. (1 mark)
Active Connections
Proto Local Address Foreign Address State PID
TCP 10.0.0.58:139 0.0.0.0:0 LISTENING
TCP 10.0.0.58:5040 0.0.0.0:0 LISTENING 7480
TCP 10.0.0.118:139 0.0.0.0:0 LISTENING 4
TCP 10.0.0.118:52450 52.63.165.133:443 ESTABLISHED 14080
TCP 10.0.0.118:52458 104.116.191.195:443 CLOSE_WAIT 8912
TCP 10.0.0.118:52791 40.100.151.2:443 ESTABLISHED 22400
TCP 10.0.0.118:52811 162.125.34.129:443 ESTABLISHED 4696
TCP 10.0.0.118:52820 34.232.224.128:443 CLOSE_WAIT 4696
TCP 10.0.0.118:52879 162.125.34.129:443 ESTABLISHED 4696
...
c) Do a TRACERT on your computer to www.google.com. Paste the output to your
assignment answer template and discuss the information being displayed (1 mark)

COIT20261 Network Routing and Switching (Term 1, 2018)
Assignment item —Written Assessment-1
TEMPLATE FOR YOUR ANSWERS
Type your answers in this section in the spaces provided
First Name:_________________________ Last Name:_________________________
Student ID: __________________________
Question Number Mark
allocated
Mark
earned
Question 1: (3 marks) 3
a)
b)
c)
Main Network Address - 154.78.177.0/27
Broadcast Address - 154.78.177.31
Min Host IP address - 154.78.177.1
MAX Host IP address - 154.78.177.30
1 mark
each
item,
total 3
Question 2: (8 marks) 8
a) Address Block - 138.77.216.5/25
Address - 10001010.01001101.11011000 .00000101
Net mask - 11111111.11111111.11111111 .00000000
Wildcard - 00000000.00000000.00000000 .11111111
Broadcast - 10001010.01001101.11011000 .11111111
Number of host – 254
1
b) Subnet No. addresses Subnet address Mask /n
1 32 138.77.216.0 /26
2 32 138.77.216.64 /26
3 16 138.77.216.128 /27
4 16 138.77.216.160 /27
5 16 138.77.216.160 /27
6 16 138.77.216.224 /27
6
c) In the given address block total number of available host is 254.
Therefore, it is not possible to accommodate another subnet with
1024 address.
1
Question 3: (4 marks) 4
a)
i)
In Wireshark has total three different horizontal sections. First section
shows all packets and its details like packet number, source, destination,
.5 mark
each

COIT20261 Network Routing and Switching (Term 1, 2018)
Assignment item —Written Assessment-1
ii)
iii)
iv)
protocol, length, and sort info.
Second horizontal section shows the single selected packet details. And
the third horizontal section shows the raw packet data and hex code.
Computer brand is Helwett
IP address - 138.77.216.88.
The above address found in the second horizontal section of the
Wireshark.
In frame 4 -6 a secure communication event is occurring where in frame
4 client send a packet with a cipher to the server and say hello. In
regards it, server send a certificates along with a signature to the client.
In frame 6 all keys are exchanged between the client and server.
With the help of Wireshark, a Network administrator can prevent DDOS
attack.
Moreover, the admin administrator can monitor the unauthorised access.
item,
total 2
for 3a.
b) Proto – used protocol
Local Address – local computer address
Foreign Address – foreign computer address
State – connection status
PID – Process ID
LISTENING - The socket is listening for incoming connections.
ESTABLISHED - The socket has an established connection.
CLOSE_WAIT - The remote end has shut down, waiting for the socket
to close.
1
c) 1
Total marks awarded 15 (max)
Less late penalties if applicable
Less plagiarism penalties if applicable
Total marks earned
Markers comments: