H12-311_V3.0 · Question #30
In WLAN, the AP has been working in the half-duplex state.
The correct answer is A. True. In WLAN (802.11 standard), an Access Point operates in half-duplex mode because the wireless medium is shared and the AP cannot transmit and receive data simultaneously on the same radio channel. When the AP is sending frames, it cannot receive them, and vice versa - just like…
Question
In WLAN, the AP has been working in the half-duplex state.
Options
- ATrue
- BFalse
How the community answered
(28 responses)- A71% (20)
- B29% (8)
Explanation
In WLAN (802.11 standard), an Access Point operates in half-duplex mode because the wireless medium is shared and the AP cannot transmit and receive data simultaneously on the same radio channel. When the AP is sending frames, it cannot receive them, and vice versa - just like a walkie-talkie where only one party speaks at a time. This is why 802.11 uses CSMA/CA (Carrier Sense Multiple Access with Collision Avoidance) as its access method, which is specifically designed for half-duplex shared media. Option B is incorrect because claiming the AP is not in half-duplex would imply full-duplex operation, which standard Wi-Fi does not support since transmitting on a frequency drowns out incoming signals on that same frequency.
Memory tip: Contrast WLAN with wired full-duplex Ethernet switches that use separate wire pairs for sending and receiving. Wireless has only one shared "air channel," forcing the AP into half-duplex - one direction at a time.
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