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The second state of the state machine is the authenticated and unassociated state To move from the first state to the second, the client station must perform some kind of valid authentication This is accomplished with authentication frames Once this second state is reached, the client station can issue association request frames to be processed by the access point; however, other 80211 frame types are not allowed In most access points, the association table will now show authenticated for the client station Since the interval between reaching the authenticated and unassociated stage and moving on to the authenticated and associated stage is very small (usually a matter of milliseconds), you will not see client stations in this state very often In most cases, you will either see unauthenticated or nothing for the first state and associated for the third state The only exception to this is what is sometimes called pre-authentication A station can authenticate with any number of access points, but it can be associated with only one access point at a time The access point to which the station is associated must be a single entity in order for other devices on the network to be able to reach that station In some systems, the station is capable of authenticating with multiple access points so that it can roam more quickly when the need arises This feature is particularly useful for VoWLAN implementations
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The third and final state is the authenticated and associated state In order for a station to be in this state, it must have first been authenticated and then associated The process of moving from state two (authenticated and unassociated) to this state is a simple four-frame transaction The client station first sends an association request frame to an access point to which it has been authenticated Second, the access point responds with an acknowledgment frame Next, the access point sends an association response frame either allowing or disallowing the association The client sends an acknowledgment frame as the fourth and final step If the third step resulted in an approval of the association request, the client station has now reached the authenticated and associated state and may communicate on the WLAN or through the WLAN to the wired network The key point is to realize that you cannot transmit data frames for processing until you ve been associated and you cannot transmit association frames for processing until you ve been authenticated For the sake of the CWTS exam, remember that you are first authenticated and then associated
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This concept of roaming is important to understand as you work with medium and large WLANs In order to be called true roaming, the user should be able to move seamlessly (without user awareness) from one BSS to another without losing his network connection (IP configuration settings) and his membership in the ESS The access points hand the client off from one to another, and the client should be oblivious to the background details The client determines if the received signals are getting too weak in relation to an access point the user is moving away from and requests reassociation with another closer and stronger access point in the same ESS In the end, the client requests reassociation with a different access point and the two access points perform the hand-off These two access points should be connected to a shared distribution system Certain standards define the basics of communications on 80211 networks, and there are even standards that define how a client communicates to an access point to which it is roaming In 80211, however, there were no standards dictating how the access points communicate the hand-off of the user from the old access point to the new one until the ratification of 80211r This is why different vendors devices did not always work with other vendors devices when it came to roaming transfers Devices should begin supporting 80211r through firmware updates and out-of-the-box in late 2009 and early 2010
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