Explanation/Reference:
Explanation:
802.11r, which is the IEEE standard for fast roaming, 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. https://www.cisco.com/c/en/us/td/docs/ wireless/controller/technotes/80211r-ft/b-80211r-dg.html