COIT20229 Networking with TCP/IP (Term2, 2014)

Assessment item 1—Written Assessment

Due date: / 11:00pm AEST, 30th November / ASSESSMENT
Weighting: / 40% / 1

Objectives

This assessment item relates to the course learning outcomes 1 to 7 as stated on page3 of the course profile.

Instructions

Please write your answers to all questionsin the ‘Template for Your Answers’ Section of this document and upload only that template.Please show all your working and steps. Please ensure that you write your answers in your own words to avoid possible plagiarism and copyright violation. You can understand the Plagiarism Procedures by following the corresponding link in the CQUniversity Policies section of the Course Profile.

DO NOT copy the assignment questions with your answers, unless required. Not copying the assignment questions will reduce the similarity level on Moodle.

Question 1(1.5+1.5=3 marks)

With respect to TCP/IP;

a)Describe what physical, logical and port addresses are and why they are required.

b)Provide a real example of a physical, logical and port address - this should be from your own computer on your own network, or a lab computer or a work computer – include details of how you obtained each of the addresses and include a screen shot displaying each address – for the port address identify the application or program that is using it.

Question 2(1+1=2 marks)

An organisation has been granted a block of addresses starting with the address 172.154.68.0/22.

a)Create 3 subnets for this organisation with the first subblock of 250 addresses, the second subblock of 60 addresses and the third subblock of 12 addresses. for each correct answer)

b)How many addresses are left?

Question 3(1+1+1=3 marks)

a)Provide two reasons why you think dynamically assigning IP addresses are useful? (1 mark)

b)Is the IP address 192.168.12.254 a valid address for use by a computer connected directly to the Internet? Explain your answer.(1 mark)

c)Is it possible to divide a class C network into 14 subnets with 15 computers connected to each sub network? Explain your answer.(1 mark)

Question 4:(1+1+1+1=4 marks)

A sending application has sent 1240 bytes to a receiving application using TCP. The congestion window (cwnd) is set at 200 bytes (assume it does not change for the duration). The receiving application has sent an acknowledgement number of 1180 with a receiver window (rwnd) of 120 bytes.

a)Draw a diagram showing the sliding window and next byte pointer similar to the example provided below based on the details given above.

b)The sending application then receives a further acknowledgment of byte 1220 with an rwnd of 100 bytes. Draw a diagram representing the new sliding window and next byte pointer.

c)The sending application then sends a further 80 bytes to the receiving application, which responds soon after with an acknowledgement of byte 1300 with an rwnd of 80 bytes. Draw a diagram representing the new sliding window and next byte pointer.

d)What is the maximum amount of data the sending application can send at this time?

An example of the layout required, showing sliding window and next byte pointer(the light blue section represents the sliding window):

Following table is an example only to complete your answers.

1161-1180 / 1181-1200 / 1201-1220 / 1221-1240 / 1241-1260 / 1261-1280 / 1281-1300 / 1301-1320 / 1321-1340 / 1341-1360

Question 5 (1/2 x 6 = 3 Marks)

a)Change the following IP addresses from dotted-decimal notation to binary notation:

216.27.61.137

195.24.53.107

b)Change the following IP addresses from dotted-decimal notation to hexadecimal notation:

224.24.53.107

194.66.82.11

c)Change the following IP addresses from hexadecimal notation to dotted-decimal notation:

0xC1A86E47

0x41EE3AB9

d)Change the following IP addresses from binary notation to dotted-decimal notation:

0010111001100101 0101011110101010

1000001000111010 10101010 01001101

e)Find the class of the following IP addresses:

22.231.113.64

189.139.4.211

f)Find the netid and hostid of the following classful IP addresses:

195.245.31.142

145.134.35.121

Question 6 (1+1=2 Marks)

Given the following IPv6 addresses in hexadecimal colon notation, answer the following questions. Where applicable leave your answers in fully expanded hexadecimal colon notation.

(a)What is the full (expanded) address of the abbreviated IPv6 address FDEC::CF:0:FFFF (1 mark)

(b)What is the type of block of the abbreviated IPv6 address

2001:A100:FC1::A4B8:AE12:3217:FCBA(1 mark)

Question 7 (6 marks)

Use Wireshark tool to capture packets when you download Lecture 1 from the COIT20229 Course Webpage. Before you undertake this task, you should have Wireshark installed in your home computer/notebook and connected to the Internet. It is advisable that you have attempted the packet capture exercises using Wireshark that are scheduled for Weeks 7-9. This task cannot be completed in any CQUniversity lab.

a)Submit the captured pcap file. You should filter the file so that only TCP traffic is included. (1 mark)

b)What is the server IP address? (0.5 marks)

c)What is the application layer protocol involved? (0.5 marks)

d)What is the client port number for data download? (0.5 marks)

e)What is the server port number for data download? (0.5 marks)

f)How many data bytes have been downloaded? (0.5 marks)

g)What is the size of the downloaded Lecture 1 file? (0.5marks)

h)Discuss the difference in your answers to parts f) and g). You need to consider the packets formats in your discussion. (2 marks)

Question 8(2+2+2=6 marks)

From the following network topology diagram, develop the router table for each of the routers (R1, R2 and R3). Note that R2 is actually a Firewall/Gateway, but still acts as a router and requires a routing table.

Question 9 (11 marks)

To answer this question you are asked to take on the role of a newly employed Systems Administrator for a medium sized business. One of your duties is to administer all of the Local Area Networks (LANs). Upon initial investigation you discover that the network is using fixed IP addresses for all of the connected hardware. A considerable amount of your time is taken up with assigning and configuring IP addresses for visiting staff and staff that tend to move around the company frequently. This is obviously a poor use of your time. You decide that by implementing DHCP across all of the LANs you can save yourself considerable work which in turn can save the company money over a period of time.

Upon suggesting this to the manager you have been asked to make your case in writing. This should be in the form of a report which includes the following:

a description of IP addressing in general,
what DHCP is,
how DHCP works,
why DHCP would be beneficial to the organisation, and
Highlight the monetary and organisational benefits by comparing the two addressing methods (static and dynamic).

The manager is not an IT expert so the report should be written in such a way that the details can be easily understood by a person with minimal IT background.

The report should be approximately 1,500 words (minimum 1,000, maximum 3,000); you can include diagrams if you find it helps describe how DHCP works.

The report will be marked on the basis of correctness, completeness, relevance, and level, i.e. aimed at someone with minimal IT background.

TEMPLATE FOR YOUR ANSWERS

COIT20229 Networking with TCP/IP –Assessment Item1 (Term 3, 2014)

Fist Name:Last Name:

SID:

Question Number / Mark
allocated / Mark earned
Question 1: (3 marks) / 1.5
a)
b) / 1.5
Question 2: (2 marks) / 1
a)
b) / 1
Question 3: (3mark) / 1
a)
b) / 1
c) / 1
Question 4: (4 marks) / 111
1
a)
b) / 1
c) / 1
d) / 1
Question 5: (1/2 x 6 = 3 marks)
Question 6: (2 marks)
a) / 1
b) / 1
Question 7: (6 marks) / 3
1
a)
b) / 0.5
c) / 0.5
d) / 0.5
e) / 0.5
f) / 0.5
g) / 0.5
h) / 2
Question 8: (6 marks) / 3
2
a)
b) / 2
c) / 2
Question 9: (11 marks)
Plagiarism penalty
Late submission penalty
Total