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...

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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)
Answered Same DayDec 29, 2021

Answer To: Router X running RIP has the following routing table: Destination Cost Next Router Net1 7 A Net2 3 B...

David answered on Dec 29 2021
104 Votes
1. a) Router X does not receive any update for 200s. The expiration time is 180s after which the route becomes invalid but the table is not deleted from table. X receives update from C. The updated routing table of X is
     Destination
     Cost
     Hop
    Net1
    4
    C
    Net2
    3
    C
    Net4
    2
    C

1. b) Periodic timer=1
Expiration timer = 4-1=3
Garbage Collection Timer=1
2. The given address is 172.154.68.0/22
Total number of addresses is 232-22 = 1024. The first address of the network is 172.154.68.0
Whereas the last address is 172.154.71.0 i.e. total of 1024 addresses.
We can allocate a block of addresses which should be a power of 2 .First block requires 250 addresses. We allocate 256 addresses to this block. The Subnet mask is 25. First address is 172.154.68.0. and last address is 172.154.68.255.
Second block requires 60 addresses, not a power of 2. We allocate 64 addresses. Subnet mask is 26. First address is 172.154.69.0. and last address is 172.154.69.63.
Third block requires 12, not a power of 2. Subnet mask is 28. First address is 172.154.69.64. and last address is 172. 154.69.79.
Number of addresses left= 1024-(256+64+16)
1024-336 =688.
3. a) DHCP ( Dynamic Host Configuration Protocol) assigns IP address dynamically.
· This is useful as host moves from network to network or either connects and disconnects from network.
· Interference of human is reduced.
· Security risks are reduced.
3. b) 192.168.0.0 to 192.168.255.255 is used for private addressing. It cannot directly connect to internet. These IP addresses are used for local communication in home or private networks.
3. c) 14 subnets are required, not a power of 2, we will create 16 subnets. Thus subnet mask is /28. The last 4 bits of last octet are used for creating host. 24= 16.
Therefore, 15 subnets can be created.
4. a) First packet is sent, but not acknowledged....
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