The number of address fields is a major difference between Ethernet frames, which only use two address fields, and wireless frames that could use as many as four address fields. Lets now look at the MAC header which can contain four address fields. The DS is typically an 802.3 Ethernet wired network, but it doesn’t have to be, and the DS can even be a wireless back haul. Just a quick definition of the distribution system and basically the DS is the infrastructure that connects multiple access points together to form an Extended Service Set (ESS). Two fields of particular interest are the To Distribution System (To DS) and From Distribution System (From DS) and how these fields determine if the frame is leaving or entering the wireless environment. I had a rough idea, but during my studies learned a great deal more about the unique fields and elements dedicated to wireless that keep the network functioning and help packets get delivered.
#WIFI PACKET STRUCTURE PROFESSIONAL#
Currently I’m studying for the Certified Wireless Analysis Professional (CWAP) exam and I’m rereading the study guide and I found the chapters that examined the different fields and elements present in the MAC header most interesting.
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