ICT169 - Foundations of Data Communications - IT Assignment Help

Assignment Task

Topic – Introduction to Networks

Describe difference between packet switched and circuit switched networks
• Describe why data networks break communications into packets
• Define network convergence and identify problems associated with it
• Describe communications medium, giving three examples
• Differentiate between LAN and WAN
• Describe purpose of OSI model, i.e. what are its benefits
• Name layers of OSI and Internet models, explain how both models relate to each other
• Explain key functionality of each layer of OSI model, for each layer name a protocol operating at that layer
• Name some networking devices and identify which layer of OSI model they operate at
• Define term ‘protocol’ and describe purpose of protocols in data communications
• Differentiate and be able to convert between units used to define network speeds and data storage
• Explain encapsulation/de-encapsulation process

ISO OSI Model
• Open Systems Interconnection model
• Reference model for communication networks
• Models communication into layers
• Layer serves layers above
• Layer is served by layers below
• Layers are independent with standardised interfaces between layers which makes protocol design much easier
• Functionality of layer can be reused by higher layer protocol
• Internal changes in one layer don’t affect other layers)

Application, Presentation, and Session Layers
• Application protocols
• Data encoding
• Session handling
• Examples: Hypertext Transfer Protocol (HTTP), Simple Mail Transfer Protocol (SMTP)

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