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if wireless clients and wireless distribution systems cache PMKs between clients and APs, the PMKID can be used when a client roams "back" to an AP that it had been authenticated to previously. This would speed up roaming "back" to an old AP, since the full EAP authentication would not need to take place; the PMK already exists. Just the 4-way handshake would be necessary to generate the PTK
http://giantsnerdwifi.blogspot.com/2016/

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