SIT202 : Computer Networks - Multiplexing and Demultiplexing Services - Engineering Assignment Help

Assignment Task :

Question 1  

Computer networks are constructed using a modular architecture known as layering. 

a) Identify and describe the five different approaches to configuring IPv6 addresses. In your  answer, explain why it may be beneficial to use stateless DHCPv6. 

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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