COIT20261 Network Routing & Switching: Subnetting and Analysis

This COIT20261 Network Routing and Switching assignment solution provides detailed answers to questions regarding address usage, subnet allocation, and network tool analysis. It includes calculating network addresses, broadcast addresses, and address ranges, as well as creating subnets with specific address requirements. The solution also explores the use of network tools like Wireshark, netstat, and tracert to analyze network traffic and diagnose connectivity issues. Specifically, it involves analyzing packet captures in Wireshark, interpreting netstat output to identify applications using network connections, and using tracert to map the route to a destination address. The document is available on Desklib, a platform offering a variety of study resources for students.

COIT20261 Network Routing and Switching (Term 3, 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 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 PAGE-4 FOR ALL YOUR ANSWERS.

COIT20261 Network Routing and Switching (Term 3, 2018)
Assignment Item —Written Assessment-1
Question 1 – Address usage (3 marks)
Consider the following classless address in a given block:
156.120.32.3/26
Calculate the following:
a) the network address,
b) the direct broadcast address, and
c) the range of addresses available for hosts
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 128.32.16.8/22.
Answer the following questions, showing your calculations.
a) Calculate the network address of this block, and total addresses the block contains
including special addresses this block can provide. (1 mark)
b) Create the following 4 subnets for this company by calculating the subnet address for
each subnet. Answer this question by filling in the table in the Answer template.
Your subnets must use contiguous address blocks, i.e., do not leave unallocated
addresses in between two consecutive subnets. Use CIDR format for the mask. (6
marks)
I. 1 subnet with 128 addresses (1.5 mark)
II. 1 subnet with 64 addresses (1.5 mark)
III. 2 subnets with 32 addresses each (1.5*2=3 marks)
c) After allocating the subnets, how many addresses are unallocated (leftover)? Show
your calculations. (1 mark)
Question 3 – Network Tools (Windows) (4 marks)
This part of the assignment requires you to explore some common networking tools, and
answer the given questions. netstat and tracert are included in Windows, while
Wireshark is free to download and install. Explore these tools, then answer the questions.
a) A Wireshark scan has produced a packet capture, saved to a file named
COIT20261_Assign1.pcap and available on the Unit website. Download the file and
open it in Wireshark, then answer these questions about the scan:
i. View Frame 98, and answer the following questions: What kind of message is the
frame carrying (protocol name/type). What is the destination host’s domain name?
(1 mark)

COIT20261 Network Routing and Switching (Term 3, 2018)
Assignment Item —Written Assessment-1
ii. View Frame 644, and answer the following questions: Which transport layer
protocol was used? Scan a few more frames down: what general activity was the
user most likely engaged in? – give reasons (1 mark)
b) A ‘NETSTAT –aon’ command has given the output as shown below. Focussing on
line 2 and 8 (highlighted), determine and write down the name or type of the
application that is running over these two connections. What are the major differences
between these two TCP connections or applications? (1 mark)
Active Connections
Proto Local Address Foreign Address State PID
1 TCP 138.77.212.196:8457 40.100.145.146:443 ESTABLISHED 8044
2 TCP 138.77.212.196:8479 172.217.25.37:443 ESTABLISHED 10708
3 TCP 138.77.212.196:8560 40.100.146.178:443 ESTABLISHED 8044
4 TCP 138.77.212.196:8573 138.77.208.123:61158 ESTABLISHED 2464
5 TCP 138.77.212.196:8574 138.77.208.123:61158 ESTABLISHED 2464
6 TCP 138.77.212.196:8588 54.70.116.101:443 TIME_WAIT 0
7 TCP 138.77.212.196:8598 23.101.222.246:443 ESTABLISHED 15988
8 TCP 138.77.212.196:8605 138.77.0.41:80 ESTABLISHED 7460
c) Do a TRACERT on your computer to www.bom.gov.au. Paste the output of your
tracert command to your assignment answer template and discuss the output in
sufficient details to demonstrate your understanding of the information being
displayed by the tracert command. In your discussion, you must include specific
information displayed on the output, e.g., host address, etc., that you have pasted in
the assignment. (1 mark)

COIT20261 Network Routing and Switching (Term 3, 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)
Network Address - 192.120.32.0
Direct broadcast address – 192.120.30.63
Address range - 192.120.32.1 - 192.120.32.62
1 mark
each
item,
total 3
Question 2: (8 marks) 8
a) The major network address is 128.32.16.0/22 and available addresses are
1022.
1
b) Subnet No. addresses Subnet address Mask /n
1 128 128.32.16.0 /24
2 64 128.32.17.0 /25
3 32 128.32.17.128 /26
4 32 128.32.17.192 /26
6
c) Total available addresses – 1022 and allocated addresses are 504. So,
total unallocated addresses are 1022-504 = 518
1
Question 3: (4 marks) 4
a)
i)
ii)
This frame is carrying ping request by using the ICMP protocol.
Ip address = 54.230.245.246
TCP is used. User wants to establish a connection with the destination
address.
1 mark
each
item,
total 2
for 3a.
b) On line 2 SSL is used and on line 8 HTTP is used.
SSL is secure socket layer which operate on transport layer where the
HTTP is works on application layer.
1

COIT20261 Network Routing and Switching (Term 3, 2018)
Assignment Item —Written Assessment-1
c)
TRACERT command is used to determine the destination address route
or path by utilizing the ICMP protocol. Here the destination address is
www.bom.gov.au. First the ping request mygateway (ip address –
10.0.0.138). Then it goes to next address which is 58.96.2.228. in third
packet is goes via 10.1.31.106. after that the fourth packet goes via
218.100.78.36. At last the packet goes to destination address
23.210.81.33.
1
Total marks awarded 15 (max)
Less late penalties
Less plagiarism penalties
Total marks earned
Markers comments: