After a terminal supporting Wi-Fi 6 is connected to a Huawei AP, the theoretical rate of establishing a Wi-Fi link between the terminal and the AP is 12Gbps. The terminal now uses FTP to download…

Question

Options

• ATrue
• BFalse

• A
  26% (9)
• B
  74% (25)

Explanation

B is correct because Wi-Fi link rates (like 12 Gbps) represent theoretical PHY-layer maximums calculated under ideal conditions, while actual FTP download throughput operates at the application layer - always significantly lower due to TCP/IP and FTP protocol overhead, acknowledgment traffic, channel contention, signal quality variation, and hardware processing limits.

Why A is wrong: It conflates the physical layer negotiated rate with application-layer throughput, which are fundamentally different things. Even in a perfect lab environment, real-world throughput typically achieves only 50–70% of the theoretical PHY rate at best.

Additionally, Wi-Fi operates in half-duplex - the same channel carries both download data and TCP acknowledgments - further reducing effective one-direction throughput.

Memory tip: Think of the Wi-Fi link rate like a highway's speed limit sign - the sign says 100 mph, but actual average traffic speed is far lower due to congestion, tolls, and road conditions. The "speed limit" (PHY rate) is never the "actual speed" (application throughput).

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