题目内容

For Shannon's Theorem:

A. It does not consider noise on the channel
B. It is more accurate more the Nyquist's Therom
C. it uses signal-to-noise ratio
D. It can only be applied on copper wires

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If the baud rate is 1200 symbol per second and Quadrature Phase-shift Keying is used for modulation, please calculate the data rate:

A. 300 bps
B. 600 bps
C. 2400 bps
D. 4800 bps

The sequence number used in Protocol 3 can range between 0 and 1.

Procotol 3 uses timer and sequence number.

Protocol 2 considers noise on the channel and requires feedback from receiver.