Academic help online

Academic help online
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 forany threecorrectrowentry)
b)Router X does not receive any update for another90s. How many periodic,expiration and garbage collectiontimersare now running in router X? (0.5 marks for each correct answer)
Question 2 (2 marks)
An organisationhas been granted a block of addresses starting with the address 172.154.68.0/22.
a)Create 3 subnets for this organisation with the firstsubblock of250 addresses, the secondsubblock of 60 addresses and the thirdsubblock of 12 addresses. (0.5 marks for each correct answer)b)How many addresses are left? (0.5 marks)
Question 3(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)
Question4: (3 marks)
The source on a TCP connection has sent 100 bytes and is using a window size of 400. The source has received no acknowledgments for receipt of bytes.
a.Draw a diagram showing the sliding window and pointer at the source. (1 mark)b.Draw a diagram showing the sliding window and pointer at the source after the source sends a further 2 sets of 100 bytes. (1 mark)c.After b. the source receives acknowledgment of receipt of byte 300 and an announcement of a new window size of 300 bytes. Draw a diagram showing the sliding window and pointer at the source. (1 mark)
An example of the layout required (the grey section represents the sliding window):
0-100
101-200
201-300
301-400
401-500
501-600
601-700
701-800
?Pointer
Question5 (3 Marks)
a.A host with IP address 122.34.23.11 sends a message to a host with IP address 136.34.23.11. Does the message travel through any routers? Explain why. (Assume no sub-netting) (1 mark)b.A packet on a Class B network has the address 0.0.110.12. Will it travel through any routers? Explain why. (1 mark)c.If a host with IP address 212.85.16.10 sends a message with the destination IP address of 127.19.1.5, will it travel through any routers? Explain why. (1 mark)
Question 6 (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)
Question7(6 marks)
Use Wireshark tool to capture packets when you download Lecture1 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 haveattempted the packet capture exercises using Wireshark that are scheduled for Weeks 7-9. This task cannot be completed in anyCQUniversity lab.
a)Submit the capturedpcap 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 applicationlayerprotocol 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 thesize 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. (2marks)
Question8 (18 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 agiventime and some patients travel over 100km to see a doctor. Currently, when adoctorneeds to receive advice from aspecialist, themedical centre first sends the reportsof the patientto the specialist and then the doctor talks to the specialistover the telephoneat a convenient time tobothparties. As such, the patient can be advisedof the diagnosisonly at a latertimevia 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 homesrather than them having to travel to the centre. The mobile doctors should be able to connect wirelessly to the medical centre andalsocommunicate 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 topremises connections under the National Broadband Network (NBN).Several service providers cover this area with 3G mobile service.Design the network ofthe medical centre and that of the vehicle of the mobile doctors. Draw the network diagrams of both anddescribe your design in words. Your design shouldconsidersuitable 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)listthe assumptions made. (1 marks) –Note: The assumptions are not therequirements that are provided in the task. They are theadditionalrequirements that you need foryour design.b)provide thenetwork diagrams. (2 marks)c)describeyour design. (2 marks)d)justify your design. (2 marks)e)listthenetworking and communicationdevices required,including the IP addresses, product numbers,the costof each and theapproximatetotal cost. (1 marks)f)select a suitableInternetservice provider andshowthe associatedapproximateannual cost. (1 marks)

Academic help online

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