{HEAD ~ The L2 switches} may collect this information at the time the end user is authenticated, such as by using an end user software access client or {TAIL ~ a 802.1x port based network access control protocol} modified to request such security information 
{ HEAD ~ The L2 switches } may collect this information at the time the end user is authenticated , such as by using an end user software access client or { TAIL ~ a 802.1x port based network access control protocol } modified to request such security information
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