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Lab 3

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Intro Networking
Lab 3
3.1.1
It would be very hard for all devices to communicate with each other. Everyone would have to buy the same brand for the devices to communicate. This would be horrible for businesses and people. Everyone would have to buy the same brand. That would make sure that they can all talk to each other. Businesses would not be able to talk to other departments. Things would not run smoothly.
3.1.2
The OSI model breaks down all the layers. And describes the layers and what they do. This model is used all the time in networking.
3.1.3
Data link, network, transport, and session.
3.1.4
It would be harder to find the problem. If all the layers were to general no one would be able to figure out what layer the problem is on. The problem could fit on multiple layers if it was to general.
3.1 Review
1. It does not give any information. Those layers are very big. Just to have 3 layers would not be able to find out the problem and find a way to fix it. With products changing there would be no way for a standard for communication.
2. Charles Bachman made the OSI model in the late 1970’s. It was made so other devices can talk to each other even if they are a different brand.
3. It was made by the Department of Defense. It was made to protect data integrity.
3.2.1
Physical- cables, modem, router or anything physical or hardware
Data Link- how the data is sent
Network- managing the network
Transport- how the data travels
Session-managing communication
Presentation- how the data is translated
Application- how you open the data.
3.2.2
Bit frame, Packet Diagram, segments.
3.2.3
The data being sent is in a data packet. The packet has the address on where it goes and where it is from. Then the data is sent. Once the data is at its destination it is open by a certain application.
3.2.4
The router decides what is sent and what is not. The upper layer is not needed because the router handles that by its self. It makes sure that everything gets to your computer.
3.2 Review
1. It could lead to other devices like the actual server, router, and modem. There would be where most of the physical problems would happen.
2. It has lasted so long because it is a great standard. It also because it works. Without it devices would not be able to communicate as easy.
3. Yes, those layers could still have problems. Not everything is perfect. There will be a time where the application does not work or something happens to the data along the way.
3.3.1
The TCP/IP only has 4 layers. And all it is a mashed together OSI model. The application layers as two other parts the presentation and the session layer.
3.3.2
Physical, data link, network, transport, application
3.3.3
The TCP/IP is use mostly for the internet and the UDP is used for the ports on the computer.
3.3 Review
1. The destination ports. They would say if the packet made it or not.
2. It is mostly used for the internet and how data is sent.
3.5.1
You would need it for work. That way people could know if something is wrong with your network
3.5 Review
1. Other people can see your file. It would be ok if you were ok if those file going to the public. The file could be in the cloud.
2. Other people would be able to use your printer. And possible get in to your computer if it is connected to the printer.

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