Subject Code : SIT202
Country : Australia
Assignment Task

Use of Illustrations 
Note that several questions below may require you to include an illustration in your answer. This  must be your own illustration, not a graphic copied from the Internet or any other source  (textbook, class slides, etc.). Illustrations from the Internet (whether directly copied or  reproduced by you) will not be awarded any marks. 
There are many illustration programs that you may use for this purpose, including several free  applications accessible via the Web. If you are unable to use these programs however, you may  include a scanned/photographed hand-drawn illustration in as long as that illustration is clearly  legible. 
HD Tasks 
Note that there are one or more “HD Tasks” identified in the requirements below. These tasks are  more difficult to answer and total 20% of the marks available for this assessment. A HD result  reflects achievement in the unit of a deep understanding of the unit content and ability to extend  your knowledge beyond that covered in the unit directly. You can expect these tasks will be  assessed harder than other tasks reflecting demonstration of this level of achievement.
Submission 
Answers must be submitted via the unit site (CloudDeakin) to the TurnItIn-enabled folder for  Problem Based Learning Task 2. Answers to each question and sub-question must be clearly  identified in your submission. Acceptable file formats include Word documents, PowerPoint  documents, PDF documents, text and rich text files, and HTML. Compressed files such as ZIP files  
or RAR files, or any other format that cannot be processed by TurnItIn cannot accepted and will  not be marked. 
Extensions 
Applications for an extension can be made before the due date/time via the tool in the unit site  (CloudDeakin). The link to the extensions tool can be found by clicking on the Assessments menu  at the top of the screen and selecting the Extension Request link. Extension applications must  clearly explain unusual circumstances that have impacted your studies and must contain enough  information for the duration of any extension to be determined. Students applying on the basis of  a LAP must at a minimum indicate they are supported by a LAP and indicate that the request for  an extension is linked to the disability. 
Applications for special consideration can be made at any time including (for a limited time) after  the due date/time. Information on applying special consideration can be found here: 
Note: Applying for an extension or special consideration does not guarantee a positive outcome.  You should always continue working on the basis that an extension is not granted, such as  submitting any work you have completed by the original due date/time to avoid a late penalty.  If an extension is then granted you can resubmit an updated version of your assessment later.
Question 2 
a) Transport protocols usually provide multiplexing and demultiplexing services. Explain how  this works and why it is necessary. 
b) (HD Task) Sliding-window flow control provides both flow control and error control. The  TCP protocol implements a variant of this, where an acknowledgement can be sent for  segments received without granting permission for additional segments to be sent. If the  underlying IP protocol were modified to provide a reliable service, guaranteeing that all  segments sent by TCP arrived at the destination without error, explain why it would still be  useful to separate the acknowledgement and the granting of permission. 
Question 3 
a) Select three popular Internet domains, examples of which could include amazon.com,  facebook.com, google.com, microsoft.com, reddit.com, or any other popular domains of  your choosing. 
i. Obtain the SOA records for each of your chosen domains and present their data in a  table. 
ii. Briefly explain the meaning of each field. 
iii. Discuss how the observed different values will impact other DNS servers. b) (HD Task) We have examined the HTTP protocol in this week’s materials. For constrained  devices such as IoT devices, alternative protocols such as the Constrained Application  Protocol (CoAP) are often used instead. 
i. Describe the CoAP protocol. 
ii. Explain why CoAP might be preferred for constrained devices.
Question 4 
a) In Week 9 on Slide 6, a figure is shown illustrating SNMP querying how many UDP  datagrams have been received by an agent (the agent could be an individual host or a  router). Explain how such simple data can be made useful. 
b) One of the problems encountered for multimedia is jitter. Explain how a playback buffer  solves the problem of jitter and discuss whether a playback buffer is useful for live events  such as a video call/conference.  
Question 5 
a) Digital signatures work by generating and signing a digest of a message. Explain why only a  digest is signed and why it isn’t necessary to sign the entire message. 
b) Consider an organisation that has two sites (offices, branches, etc.), each with a typical  connection to the Internet via an ISP (such as an NBN connection like many Australian  homes). To secure communication between the two sites, a site-to-site VPN has been  established using IPsec ESP in tunnel mode. 
i. Draw an illustration showing the two sites and their connection to the Internet, the  VPN tunnel, packets travelling between the individual sites and public Internet  sites, and packets travelling between the sites. 
ii. Briefly discuss the advantages of this approach and explain the services provided by  the VPN.

 

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  • Posted on : October 22nd, 2018
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