• Assessment item 2
Assessment item 2
Value: 15%
Due date: 10-Apr-2015
Submission method options
Alternative submission method
Task
Instructions
It is expected that answers to the assignment questions be succinct (i.e. precise and concise) with all sources of information fully referenced as per APA referencing style. You have to reference the text book and the readings plus any additional material you have used in your answers.
See CSU Library website for more on referencing and style:
http://www.csu.edu.au/division/library/tutorial/reference/refbib.htm
A guide to the APA style of referencing (the style now used by the Faculty of Business) is available at:
http://www.csu.edu.au/division/studserv/learning/pdfs/apa2008.pdf
Answers MUST be written in your own words. If an answer contains more than 20% direct quote (referenced or unreferenced) 0 marks will be awarded for this question.
One or two sentence answers will be too short and only receive low marks. Answers longer than 1.5 pages (12 point font, single line spacing) may incur a penalty if too much non-relevant information is stated.
For mathematical and subnetting questions it is expected that you show intermediate steps of your working. Just stating the correct solution will result in low marks, on the other hand if the working is correct and you only made minor mistakes, you will still be awarded marks, even though the final answer is wrong.
Question 1
Discuss why packet switched networks are used for data communication instead of circuit switched [3 marks].
Question 2
(Show your working and give a short explanation for each answer.)
An ISP is granted a block of addresses starting with 150.80.0.0/16. The ISP needs to distribute these blocks to 2600 customers as follows:[10 marks]
a. The first group has 200 medium-size businesses; each needs approximately 128 addresses.
b. The second group has 400small-size businesses; each needs approximately 16 addresses.
c. The third group has 2000 households; each needs 4 addresses
Design the sub blocks and give the slash notation for each sub block. Find out how many addresses are still available after these allocations.
Question 3
Consider the diagram below. Which of the two central routers (R1 and R2) is more critical for network operations and why? [3 marks]

Question 4
TCP opens a connection using an initial sequence number (ISN) of 14,534. The other party opens the connection with an ISN of 21,732.[10 marks]
a. Show the three TCP segments during the connection establishment.
b. Show the contents of the segments during the data transmission if the initiator sends a segment containing the message - Hello dear customer- and the other party answers with a segment containing - Hi there seller-.
c.Show the contents of the segments during the connection termination
Question 5
Compare and contrast DCHP and the ICMP messages that were previously used for startup configuration. What are the advantages of DHCP that caused it to be the popular solution? [ 4 marks]
Online submission via Turnitin is required for this assignment.
Rationale
This assignment relates to learning objectives of this subject.
Marking criteria
Marks will be awarded for
o Correctness of the answer
o Number of valid points or features discussed (how many advantages, how many security risks)
o Clarity of explanation
o Correct in-text referencing and reference list according to CSU standard
o Steps of working in question 2.
Question Criteria HD~DI CR~PS FL
Q1.Switch • Number of valid points
• Clarity of explanation
• Depth of understanding
• Referencing Deeply understand the concepts, and clearly explain them. Satisfactory,
Contains minor errors/omissions contain main concept errons/omissions
Q2.Calculations a
b.
c. Correct Answer
Correct calculation steps Minor omissions or errors Major omissions or errors
Q3.Router • Which
• why Clearly Described Minor omissions or errors Major omissions or errors
Q4.TCP segments • Thee TCP segments
• Contents of the segment
• (data)
• Contents of the segments( termination) Excellent illustration provided Minor omissions or errors Major omissions or errors
Q5. DHCP and ICMP • Comparison
• Advantages Good Minor omissions or errors Major omissions or errors
Overall Assignment Referencing • Use of citations and quotes
• References Strategically used in support
Clear acknowledgement of other people’s ideas
Always or mostly conforms to stipulated style Over use of quotations
Sources not well integrated within answers
Minor errors in style Not always proper acknowledgement of sources
Text of quotations not clearly identified
Major errors in style
Inconsistent use of styles