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For the IEEE 802.11 MAC protocol for wireless communication, which of the following statements is/are TRUE? I. At least three non-overlapping channels are available for transmissions. II. The RTS-CTS mechanism is used for collision detection. III. Unicast frames are ACKed.

1. All I, II, and III
2. I and III only
3. II and III only
4. II only

Correct answer: I and III only

Solution

Statement I is true because the IEEE 802.11 standard provides multiple non-overlapping channels for efficient communication. Statement III is also true as unicast frames require acknowledgment to ensure successful delivery. However, statement II is incorrect because the RTS-CTS mechanism is used for collision avoidance, not detection.

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