Ad-Hoc network to communicate with each other, they must use the same ESSID
a)Beacons:Beacons frames are like someone shouting 'I am Here' and telling about his presence.Access point shout loudly in their vicinity telling every client about his existence.
b)Probes:Probes frames comes in two flavour.Probe Request and Probe Response.When a client need some info about an access point it sends a probe request and access point respond to it by sending what we call probe Response.Probes Response contain info about access point like channel it uses,frequency,band available,data rates etc.
c)Authentication:Two types are request and response.client send request for authentication that contain some secret and AP replies according to it by sending auth Response
d)Association:whenever a client passes authentication step it moves to association step in which it send a association request and AP respond by sending association response.Its a way the AP allocate resource for new client.Association frame have three types:1:Association Request,2:Association Response,3:Disassociation
CTS(Clear to send)
Ack to send
Meat of whole 802.11 protocol structure.
Thats all for part one,this may be little boring to read all this theory but believe me if you really want to
hack something then you should known its basics clearly.
In Next Part We will do Some practicals to understand the importance of what we have just studied.