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COS2626Computer Networks
Semester 2 : (15 August 2014)
Chapter 3: Networking Standards and the OSI Model
Data Modulation
1. Explain why the conversion between digital and analog signals
is necessary.
2. Describe a modem and explain its purpose.
3. Define and describe data modulation.
4. Define and describe a carrier wave.
5. Define and describe an information wave.
6. Define and explain how frequency modulation works.
7. Define and explain how amplitude modulation works.
8. Use Figure 3-5 to illustrate how a carrier wave is modified
through frequency modulation.
Simplex, Half-Duplex, and Duplex
1. Define and discuss simplex transmission.
2. Define and discuss half-duplex transmission.
3. Define and discuss full-duplex transmission.
4. Use Figure 3-6 to illustrate the three transmission
types.
