How to set the conditions for switching triggers? (Multiple choice)

Question

Options

• AWhen the distance between the STA and the original AP reaches a certain distance, start the
• BSet the signal strength ratio between the current AP and the neighbor AP, and switch when the
• CCheck the packet loss rate, and start switching when the packet loss rate reaches a certain value
• DStart switching when the network speed is very slow when associating with the original AP

• A
  17% (9)
• B
  74% (39)
• D
  9% (5)

Explanation

Options B and C are correct because they describe measurable, signal-based criteria that directly reflect connection quality: comparing signal strength ratios (RSSI) between the current AP and a neighboring AP gives the client a data-driven reason to roam, while packet loss rate is a reliable real-time indicator of degrading link quality that justifies initiating a handoff.

Option A is wrong because physical distance alone is not a reliable metric - walls, interference, and antenna patterns mean a nearby AP can have poor signal and a distant one can have excellent signal; distance doesn't map cleanly to connection quality.

Option D is wrong because "network speed is very slow" is too vague and reactive - by the time throughput has visibly degraded to the user, the connection may already be significantly impaired, making it a poor trigger condition compared to proactive signal-ratio monitoring.

Memory tip: Think "B and C = measurable thresholds" - signal ratio compares where you could go vs. where you are, and packet loss measures how bad it's gotten. Distance (A) and perceived slowness (D) are indirect/subjective proxies that wireless systems don't use as roaming triggers.

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