Which of the following technologies is a method to realize STA fast roaming? (Multiple choice)

Question

Options

• APMK caching
• BKey agreement moved down
• CImprove the initiative of terminal roaming
• DHome Agency Department on AC

• A
  71% (32)
• C
  20% (9)
• D
  9% (4)

Explanation

PMK Caching (A) and Key Agreement Moved Down (B) are both recognized IEEE 802.11 fast roaming mechanisms that reduce authentication delay during handoff. PMK (Pairwise Master Key) caching stores the security keys from a previous association so a returning or pre-authenticated STA can skip the full 802.1X exchange. "Key agreement moved down" (as in 802.11r Fast BSS Transition) relocates the 4-way handshake into the reassociation frames themselves, eliminating the separate post-association key negotiation round-trip.

C is incorrect because improving a terminal's initiative to roam (roaming aggressiveness/triggering, covered by 802.11k/v) affects when and where the STA decides to roam, not how fast the authentication completes once it does - it's a roaming decision aid, not a roaming authentication accelerator.

D is incorrect because "Home Agency on AC" conflates Mobile IP concepts (Home Agent) with WLAN fast roaming; wireless controllers (ACs) do assist roaming coordination, but a "Home Agent" function is not a defined STA fast roaming method.

Memory tip: Both correct answers are about cutting the security handshake short - one by reusing saved keys (cache = reuse), the other by parallelizing key negotiation with reassociation (moved down = happens sooner). If an option is about triggering roaming or non-WLAN mobility concepts, it's a distractor.

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