- Question 1 (3.5 marks)
Router X running RIP has the following routing table:
Destination Cost Next Router
Net1 7 A
Net2 3 B
Net3 4 C
Net4 3 D
a) Assuming no other route update message has been received, show the updated routing
table after router X has received the RIP message shown below from router C after
200s:
(Net1, 4), (Net2, 3), (Net4, 2). (0.5 marks for each correct row entry)
b) Router X does not receive any update for another 90s. How many periodic, expiration
and garbage collection timers are now running in router X? (0.5 marks for each
correct answer)
Question 2 (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. (0.5 marks
for each correct answer)
b) How many addresses are left? (0.5 marks)
Question 3: (3.5 marks)
Consider the following UDP header dump:
BB400045003AFF10
a) Identify the source port number. (1 mark)
b) Identify the destination port number. (0.5 marks)
c) What is the length of the data? (1 mark)
d) Is it a packet from the client to the server or vice versa? (0.5 marks)
e) What is the client process? (0.5 marks)
Question 4 (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.
Submit the captured pcap file. You should filter the file so that only TCP traffic is included.
(1 mark)
a) What is the server IP address? (0.5 marks)
b) What is the application layer protocol involved? (0.5 marks)
c) What is the client port number for data download? (0.5 marks)
d) What is the server port number for data download? (0.5 marks)
e) How many data bytes have been downloaded? (0.5 marks)
f) What is the size of the downloaded Lecture 1 file? (0.5marks)
g) Discuss the difference in your answers to parts f) and g). You need to consider the
packets formats in your discussion. (2 marks)
Question 5 (25 marks)
A rural medical centre in Australia plans to improve its services to the community by
providing telemedicine and healthcare. The centre has 4 doctors working at a given time
and some patients travel over 100km to see a doctor. Currently, when a doctor need to
receive advice from a specialist, the medical centre first sends the reports of the patient to the
specialist and then the doctor talks to the specialist over the telephone at a convenient time to
both parties. As such, the patient can be advised of the diagnosis only at a later time via the
telephone. This procedure delays the diagnosis process considerably.
The centre management has decided to improve the service not only to the patients that
visit the centre but also to those living about 200km away by having a small team of mobile
doctors and paramedics. The idea of the mobile team is to provide consultations to the needy
patients at their home rather than them having to travel to the centre. The mobile doctors
should be able to connect wirelessly to the medical centre and also communicate with the
specialists directly. The mobile doctors and the doctors at the medical centre should be able
to scan/photograph and send the reports of the patients immediately to the specialists.
Currently, there is only landline telephone connection to the medical centre and the
surrounding 200km radius of area but the government plans to provide fibre to premises
connections under the national Broadband Network (NBN). Several service providers cover
this area with 3G mobile service. Design the network of the medical centre and that of the
vehicle of the mobile doctors. Draw the network diagrams of both and describe your design
in words. Your design should consider suitable IP addresses and devices, network security,
redundancy, scalability and cost issues.
Note: you need to undertake a serious literature research on such mobile networks and
medical centres, and associated medical and communication equipment required. You need to
a) list the assumptions made (2 marks) – Note: The assumptions are not the
requirements that are provided in the task. They are the additional requirements
that you need for your design.
b) provide the network diagrams (3 marks)
c) describe your design (3 marks)
d) justify your design (3 marks)
e) list the networking and commination devices required, including the IP addresses,
product numbers, the cost of each and the approximate total cost. (2 marks)
f) select a suitable Internet service provider and show the associated approximate annual
cost. (2 marks)
g) discuss in about 500 words, if the centre and the patients are going to benefit from
the planned NBN. You need to discuss the advantages and disadvantages both. (10
marks).
