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Homework answers / question archive / Open Book You must show your work

Open Book You must show your work

Computer Science

Open Book

You must show your work. Correct answers without showing your work may not receive full credit. Incorrect answers with some correct work shown may receive partial credit.

State all assumptions with your answers.

Problem 1 (10 points) Mobility – Wireless

You are a network engineer designing for a new service. Your service requirements are:

  • Bit Error Rate: 1 out of 1000
  • Minimum throughput: 1 Mbps

 

 
 
 

 

 

  1. If your SNR is 20dB, based on these possible modulation schemes above, which one would you select and why?
  2. Turns out, one of your users only has SNR of 10dB, does this change your decision to a)? What modulation scheme would you select now and why?

 

  1. Turns out, one of your users only has SNR of 3dB, what can you do to make sure this user can also use your service?

 

 

Problem 2 (10 points)

 

You want to send a message to a friend and receive a reply using email over a network. What you are communicating is top secret and therefore you want to make sure it is going to your friend and that the communication is not viewable by others. (Be explicit on the process, keys, certificates, and encryption algorithms you will use in these following steps)

 

  1. How are you going to ensure that the message cannot be viewed by others but can be viewed by your friend?
  2. How will you ensure that the reply you received from your friend indeed came from your friend?
  3. How will you know if the reply that you received has not been tampered with before arrival?
  4. How can your process be breached (revealing the messages) and how difficult would it roughly to do so (process and time needed)?

 

 

Problem 3 (10 points)

 

You have a HD video (3 hours long) that you want to stream to a friend. Your friend has a very slow network connection.

 

  1. What can you do with FFMPEG that can reduce the size of the file before sending this to your friend? (be specific)
  2. Your friend liked the video very much but it does not have audio. You can stream the audio file also but how can you ensure the audio and video streams will actually be synchronized for playback? (be specific)
  3. In part a) is this considered source coding or channel coding?

 

Problem 4 (5 points)

 

You are starting a new company and have created web content for your webpage.

 

  1. How do you go about registering your domain name?
  2. How can you make sure that your customers are able to connect to your website? (e.g. how will their DNS server resolve to your IP)
  3. You want to operate a secure website. Explain how you will ensure that connections to your website is secure (be specific).

 

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