Dr. Kathleen M. Kaplan's
Data Communication Networks
Quiz #3


The following quiz is on material from Chapter 2 of the text (2.1, 2.2, 2.3, and 2.4) and the homework assignment from Chapter 2.

  1. Given the diagram below showing reflected and refracted light:
    Not shown here!
    Give the equation for the index of refraction, R.
    R = (cos alpha)/(cos beta)
    Explain if it is better to have R < 1 or R >1. (Short answer!)
    R < 1, then alpha > beta and there is little refracted light - all light is reflected!

  2. What are the three categories of transmission media?
    1. Conductive Metal
    2. Optical Fiber
    3. Air (wireless)

  3. What are the three methods for translating digital signals (given in class and for homework)?
    1. NRZ
    2. Manchester
    3. Differential Manchester

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© Kathleen M. Kaplan 2000
Dr. Kathleen Kaplan, Howard University
Email: [email protected]