All right, so let's begin our journey by looking at the structure of an eight to nine 11 match frame.
So a Mac frame is constructed of common fields and specific fields so quickly provide a short explanation
of each.
All right, so Mac frames consist of three main structures.
The frame body as a variable length field, it contains information specific to individual frame times.
FCC stands for frame check sequence.
All right, so it's an error detecting code that's added to each frame.
And in the back header, there's a frame control section, right, so the very first two octets transmitted
by a station are the frame control.
Protocol version.
Now, this will provide a version of the 211 protocol used and the values currently zero.
You also have tape in some type.
I'll tell you what the function of the frame actually is, so there are three different frame types
of field control data management.
There are multiple subtype fields for each frame type, and then each subtype determines the specific
function to perform for its associated frame type.
So to move on.
To D.C. and from D.C. indicates whether the frame is going into or exiting the distribution system.
All right.
More frag indicates whether more fragments of the frame are to follow this one.
We're not.
Retry indicates that the frame is being retransmitted.
Power management indicates whether the sending EPA is in active mode or power save mode.
Webb indicates whether or not the encryption and authentication are used in the frame.
Order indicates that the frame is being sent using the strictly ordered service class.
Right now, the field is usually not set.
Duration ID indicates that time on the channel that the sender is assuming to be occupied from the end
of the current frame.
Now, here are some different cases of the fields of addresses, depending on the communication between
the station and the access point.
Sequins control is used to recognize frame duplication by setting the sequence number of each frame.