Homework #3

4.3, 4.4, 4.49, 4.61

Additional problems: 

A1: Give a daily life example for Time Division Multiplexing. 
    Give a daily life example for Frequency Division Multiplexing. 
    Give a daily life example for Code Division Multiplexing. 

A2: Give a scenario in which circuit switching is more efficient 
    than the packet switching. Give an example to show that 
    packet switching is better than circuit switching.