Cisco Certified Network Professional Enterprise CCNP Enterprise · Free Practice Question Medium
Question 5
You want to improve the performance of roaming in your FlexConnect infrastructure. Specifically, you want to employ the Fast Transition feature. What technology permits this?
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A
802.11s
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B
802.11r
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C
802.11p
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D
802.11q
Reveal correct answer
Correct answer: B
Explanation
"802.11r introduces a new concept of roaming where the initial handshake with the new AP is done even before the client roams to the target AP, which is called Fast Transition (FT). The initial handshake allows the client and APs to do the Pairwise Transient Key (PTK) calculation in advance. These PTK keys are applied to the client and AP after the client does the reassociation request or response exchange with new target AP. In a FlexConnect Deployment scenario, 802.11r BSS FT roaming is supported between APs within the same FlexConnect group. To enable seamless roaming, the 802.11r Key Cache is distributed to all the APs in the same FlexConnect Group. The Key Cache distribution is done by the WLC after the client device does the initial FT association through Central Authentication."
REFERENCE: https://www.cisco.com/c/en/us/td/docs/wireless/controller/technotes/80211r-ft/b-80211r-dg.html
Discussion
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