Subject Code : SIT202
Assignment Task:

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.

Question 1  
Computer networks are constructed using a modular architecture known as layering.
a)
 Explain how layering simplifies the protocols used in networks and intermediary devices.

b) Explain how encapsulation and decapsulation works and how these mechanisms are used to achieve logical communication between peer layers.

c) A key advantage of layering is that a protocol in one layer can be replaced with another with little or no impact. Discuss how this works, including any influence/expectations on adjacent layers (layers above/below where the protocol is replaced).

d) (HD Task) Consider a home network where a computer connected via Ethernet to the router is printing to a printer that is connected by Wi-Fi to the same router using the Internet Printing Protocol (IPP). Assuming that the Wi-Fi network is just an extension of the existing wired LAN, i.e., they are the same subnet, illustrate the communication protocol stacks of all devices in the communication path, indicating both the layer name and actual protocol (see Week 1 Slide #32 for an example without the actual protocols named).

Question 2 
Consider the differences between datagram switching and virtual-circuit switching networks.
Explain how the following aspects of communication are impacted (or why they are not impacted) by these different switching techniques:
i. Delays encountered by data travelling from sender to receiver;
ii. The order packets would arrive at the receiver; and
iii. The reliability of packets being delivered to the receiver.

 

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  • Uploaded By : Alex Cerry
  • Posted on : September 01st, 2018

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