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Unit Lab 3 Nt1210 Essay

583 words - 3 pages

3.1.1
What would happen if wireless devices were not governed by the Wi- Fi Alliance and each vendor had its own standards and protocols? What impact would this have on your personal life or business communication? I would think that you’d have trouble communicating to other devices and would separate everybody. We would most likely have to start using mail more often.

3.1.2
Give another example of a model that is used to visualize something that is difficult to observe or perceive. How does the model make it easier to understand?
I would think the OSI model would be a good example. The model it’s self-shows you how to understand it.

3.1.3
Based on what you already know about networks, what are the different layers you think would be necessary for communication to be mapped to a model? Consider direct connections between ...view middle of the document...

3.2.1

Using Figure 3- 1, define each layer of the OSI model in your own words and state what each layer provides. Use your textbook or Internet research to support your answer.

Physical – Device
Data Link – Physical address
Network – Path determination
Transport – End to end connections
Session – internet
Presentation – typing data
Application – games, downloads
3.2.2
Using Figure 3- 2 as a basis, complete the diagram to show the intermediate encapsulation provided by each layer. Use your textbook and Internet research to support your answer.
Transport – segment Network- packet Data link – Frames

3.2.3
Briefly explain the deencapsulation steps in the communication from host B receiving a message from host A destined for an active application.
First the receiving computer synchronizes with the digital signal by reading binary numbers. After synchronizing is complete and it gets the whole frame and passes it to the layer above it which is the Data Link layer.
Second the Data Link layer will do a Cyclic Redundancy Check (CRC) on the frame. Checking for errors and then strip off any information or header which was put on by the remote systems Data Link layer and pass the rest to the Network layer.
Third the Network layer checks the IP address and if it matches the Network layer header is stripped off from the packet and passed to the Transport layer.
Fourth the Transport layer processes the segment and rebuilds the data stream and acknowledges to the transmitting computer that it received each piece. Then sends the data stream to the upper layer Application.
3.2.4
Explain why routing devices do not need the upper layers of the OSI model to route traffic. What is the highest layer of the OSI model used by the router to decide where to forward traffic?

Routers do not need to show a human data packets and only help direct them to the proper location, they only operate up to the Network layer.

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