In the WLAN network intelligent roaming scenario, WAC will select the target AP that triggers the terminal to roam based on factors such as signal-to-noise ratio, access rate, and load balancing…

Question

Exhibit

Options

• A2,4,1,3,5
• B2,5,1,3,4
• C2,4,1,5,3
• D2,5,1,4,3

• A
  80% (20)
• B
  4% (1)
• C
  12% (3)
• D
  4% (1)

Explanation

Option A (2,4,1,3,5) is correct because it matches the logical sequence of the 802.11k-assisted roaming selection process: the WAC first confirms the terminal supports 802.11k (step 2), then sends a Neighbor Report Request through the current AP (step 4), the terminal responds with its Neighbor Report listing surrounding APs (step 1), the WAC combines this list with its own SNR/load/rate metrics to evaluate candidates (step 3), and finally selects and steers the terminal to the optimal target AP (step 5).

Why the distractors fail:

• B (2,5,1,3,4) incorrectly places the final roaming decision (5) before the terminal even returns its neighbor report (1) - you can't select a target without the data.
• C (2,4,1,5,3) jumps to AP selection (5) before the evaluation/analysis step (3) is complete - selection must follow analysis, not precede it.
• D (2,5,1,4,3) both moves the decision (5) too early and puts the neighbor report request (4) after the terminal already responds (1), which is impossible - the request must come before the response.

Memory tip: Use the phrase "Check → Request → Receive → Analyze → Decide" - in 802.11k roaming, the WAC always verifies capability before requesting data, and always analyzes before deciding. Any answer that reverses "Receive before Request" or "Decide before Analyze" is wrong.

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