Name: ______________________________________________________

In these exercises, the assignment is not to compute exact numbers. Instead, your job is to provide knowledgable answers to end user/management questions.

It is critical that you show any calculations used in determining your answers.

Assume propagation speed of 2 x 10⁸ meters/sec.

1. Your campus net has 1Gigbit/sec links between routers and 100Mbit/sec links to client machines. A user asks you for guidelines on how long it will take to transfer a 2Gigbyte file to a server. What is your answer?

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2. A medical office uses light Internet work, but their major network usage is to obtain medical images from a server. The owner of the server has told them that server to server transmissions from between two medical centers (using 100Mbit links to the ISP) average about 5 min. Images are 200Megabytes each. The cost of a 100Mbit link to the ISP is prohibitive. The medical users tell you that to be viable, they need to be able to download an image in 30 minutes. How fast does the link to the ISP need to be?

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3. A company has a 1.5Mbit/sec link to the Internet. Informal research indicates that employees are downloading up to 100 songs (approx 4 Mbytes each) per day during business hours (8-5). Aside from legal issues, is there a concern that this activity is affecting overall network performance?

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4. You are asked by a friend the minimum time it is possible to download a 1.5Gbyte movie over a cable modem link. What is a reasonable answer.

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   What caveats should you be careful to give your friend?

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   What do you answer when your friend asks you what is the longest amount of time the download can take?

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