Hello, everyone, welcome to our new series of Wi-Fi testing with Python.
In this lesson, we will discuss free wireless terminologies.
Let's start with the AP or access point, the access point is basically a wireless router you have at
home where at work it doesn't have to be also a router because router does routing decisions based on
the best the best part.
But you can have any access point like TCP link or D link, but only works as access points, which
allows users to connect to it and become in the same network.
The service set identifier or as a side is basically the network name you connect to using your phone
or your laptop.
The basic service set identifier or BSA side is the Mac address or the layer to address of your access
point.
The channel number.
This is the frequency which your access point is using for receiving and transmitting data.
Like, for instance, if you have an access point using two point four gigahertz, this frequency is
uses, but also the channels themselves have all different frequencies.
We will get to this later.
Now we will dive deeper into the 2.0 frame types.
The most important frames we want to talk about are the data frame, the control frame and the management
frame that one we will focus on more in this wi fi protesting series is the management frames.
Now, as you see, the Mac header has nine fields in it, but we will focus now on ADRIS one, two and
three, which, as you can see, Adris one holds the Mac address of the destination address to is the
Mac address of the Access Point or the BSA side.
We talked about before.
Right.
And that history is the address of the source.
So if we are sending frame from our laptop to to the access point, then the source Mac address will
be our laptop and address one and address to will be the same, which is the Access Point Mac address,
because we are sending from our laptop, which is a source to the access point, which is the destination.
Right.
So far, so good.
Now let's take a look at the management frame types.
We have here the authentication from Death Education Free Association request from this association
for probe request and probe response.
Let's see how it works, Insteps.
First, your laptop will scan for any access points and range by checking the beacon frames coming from
those access points the beacon frames have as A side and B as a side of the access point.
It's like advertising itself to the world.
Once your laptop sees the beacon signal, you can have the choice to connect to it or not.
If you chose to connect, then your laptop will start a sequence of frames exchange like in the picture.
It starts with a probe request.
Then the access point replies back with a probe, a probe response.
This probe request is to check if the access point is there or not.
So even if after you successfully connect to to your access point, your laptop will keep doing this
from time to time, even if the access point is out of range next to authentication frames, followed
by two association frames.
There are other frames as well.
We will discuss later like that disassociation frame or the documentation frame in the next video.
We will look at some of those frames using Wireshark.
Thank you.
And see you in the next video.