300-425 · Question #268
A customer requires fast secure roaming for Voice over WLAN. Which protocol should you recommend?
The correct answer is B. 802.11r. 802.11r (Fast BSS Transition) is the standard protocol designed to minimize re-authentication latency during roaming, which is critical for voice quality.
Question
A customer requires fast secure roaming for Voice over WLAN. Which protocol should you recommend?
Options
- AWPA2-PSK
- B802.11r
- CTKIP
- DWEP
How the community answered
(38 responses)- B95% (36)
- C3% (1)
- D3% (1)
Why each option
802.11r (Fast BSS Transition) is the standard protocol designed to minimize re-authentication latency during roaming, which is critical for voice quality.
WPA2-PSK is an authentication and encryption mode, not a roaming optimization protocol, and its full 4-way handshake during each roam introduces latency that disrupts voice calls.
802.11r defines the Fast BSS Transition mechanism, which pre-caches key material with target APs before a client roams, reducing the roaming handoff from hundreds of milliseconds to under 50 ms. This latency reduction is essential for VoWLAN because call quality degrades when roaming delays exceed approximately 150 ms.
TKIP is a legacy RC4-based encryption protocol deprecated by 802.11n and later standards and provides no mechanism to accelerate or optimize the roaming process.
WEP is a broken and deprecated encryption scheme that provides neither adequate security nor any fast-roaming capability.
Concept tested: 802.11r Fast BSS Transition for VoWLAN roaming
Source: https://www.cisco.com/c/en/us/td/docs/wireless/controller/8-10/config-guide/b_cg810/fast_secure_roaming.html
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