Topic: Networks
Assignment Details
Due Date End of Week 10
Description Assignment 2 – Document – Short/Long Answer Questions
Weighting 20% of total assessment.
Submission Electronic (see course website for details)
Notes Please use this document as a template for your assignment.
Answer each question fully. Show working where possible. Failing to show working will result in a loss of marks in some
questions.
Do not copy answers directly from the textbook or other resources. You are required to answer the questions using your own
words. Failing to do so may result in a mark of zero and possible action in relation to plagiarism.
Ensure that you number and label each question as it appears on this document.
Use Harvard style referencing where appropriate.
Please fill in the following details:
Student Name
Student Number
Q1 /6 Q2 /5 Q3 /7 Q4 /6 Q5 /6 Q6 /10 /40
0
Question 1 (6 Marks)
A workstation sends an ICMP timestamp request to a server. It receives the corresponding timestamp reply at exactly 10:20:34
pm (Universal Time). The original timestamp was 83,808,780. The receive timestamp was 86,060,920. The transmit timestamp
was 80,061,010.
Show all working for all parts. You may find it useful to draw a timeline of the events.
a) What is the sending trip time?
b) What is the receiving trip time?
c) What is the round-trip time?
d) What is the difference between the sender clock and the receiver clock?
e) What adjustment needs to be made to the workstation in order to synchronise its clock with the servers clock? Make
sure you state your answer clearly, in a sentence.
Your Answer:
a)
b)
c)
d)
e)
Marks Awarded:
Comments:
Question 2 (5 Marks)
What is the minimum number of UDP datagrams required to return a TFTP file 28,564 bytes in size from a server over an
Ethernet connection?
Show all calculations you use to obtain your answer. (You do not need to account for TFTP protocol overheads – assume this
is included in the total byte count).
Hint: determine the maximum UDP data field length first.
Your Answer:
Marks Awarded:
Comments:
Question 3 (7 Marks)
A sending application has sent 120 bytes to a receiving application using TCP. The congestion window (cwnd) is set at 100
bytes (assume it does not change for the duration). The receiving application has sent an acknowledgement number of 101 with
a receiver window (rwnd) of 100 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 121 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 100 bytes to the receiving application, which responds soon after with
an acknowledgement of byte 141 with an rwnd of 100 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?
Example of diagram required, showing sliding window and next byte pointer.
101-120 121-140 141-160 161-180 181-200 201-220 221-240 241-260 261-280 281-300
Your Answer:
Marks Awarded:
Comments:
Question 4 (6 Marks)
Describe, with the use of an example, how router table updates occur when RIP is used. Your description should include
details of the timers used and the events that trigger updates.
Your Answer:
Marks Awarded:
Comments:
Question 5 (6 Marks)
Given the network topology below which uses Link State Routing, create the routing tables for each node. (Use the Dijkstra
algorithm.)
Your Answer:
Routing table for node A Routing table for node B
Node Cost Next Router Node Cost Next Router
A A
B B
C C
D D
E E
F F
Routing table for node C Routing table for node D
Node Cost Next Router Node Cost Next Router
A A
B B
C C
D D
E E
F F
Routing table for node E Routing table for node F
Node Cost Next Router Node Cost Next Router
A A
B B
C C
D D
E E
F F
Marks Awarded:
Comments:
Question 6 (10 Marks)
The exhaustion of IPv4 address pool has hastened the change-over to IPv6. However the transition poses challenges to just
about every stakeholder involved in the delivery and consumption of Internet bandwidth.
Your task is to develop a discussion paper outlining the challenges and benefits of the transition to IPv6. You should
consider multiple perspectives (for example, ISPs, hardware vendors, bandwidth consumers etc.). You should discuss
transition strategies and requirements and identify major vendors, organisations and sites who are early adopters and change
leaders.
Your paper should be between 1500 and 2000 words (including references). Reference ALL sources (including direct quotes,
diagrams and tables). You are required to use external sources (i.e. beyond your textbook) to complete your discussion paper
e.g. Journal Articles, Scholarly Papers, etc.
Marking Scheme:
Discussion of benefits 2 Marks
Discussion of challenges 3 Marks
Discussion of transition arrangements 2 Marks
Discussion of change leaders 2 Marks
Clarity of communication 1 Mark
Note: No marks are awarded for referencing. However, marks will be deducted for every instance of:
Failure to cite in-text correctly
Failure to include & correctly cite all references in the References section
Failure to identify and cite text in your assignment that is not your own
Each instance will result in a deduction of 1 mark to a maximum of 6 marks.
Note: Should plagiarism be suspected, normal faculty processes will be followed. This may result in penalties including,
but not limited to, zero marks for the assignment or formal disciplinary proceedings.
