Because it is impossible for wireless stations to detect collisions, contention batteries required
to arbitrate access to the network.
This method is the CSI may see a method that is collision avoidance method which is used now.
It requires a more involved process of checking for existing wireless traffic before Afrim can be transmitted
wirelessly.
The stations must also acknowledge the frames upon receiving the frame or sending the frame.
Now let us have a look at the process of TSMC.
Now consider two pieces laptop and laptop and laptop.
It has to wirelessly send a frame to laptop B, so before sending laptop it must check for traffic in
two ways, right?
First, it performs a carrier sense, which means it listens to see whether any radio waves are being
received on its transmitter.
So next, if the channel is not clear the traffic is being transmitted, laptop E will decrement an
internal countdown mechanism called Random Backoff Algorithm, which we have just discussed.
This counter will have started counting after the last time the station was allowed to transmit and
all the stations will be counting down that individual times.
Now, if laptop checks for the careers ends and then there is no traffic and it's timer hits zero,
it will send the frame and the frame is restricted access point.
Now, the access point sent an acknowledgement back to the laptop e saying that it has received Afrim
from laptop E until that acknowledgement is received by laptop E, all of those stations must remain
silent.
This is very important unless and until the laptop receives acknowledgement from the access point that
had you to have received your frame.
So I'll do my work now.
Until this conversation, all other stations on the network must remain silent.
The access point will cache the frame where it already may have other cached frames that need to be
related to other stations.
Each frame that the access point needs to relay must wait.
It's done to send the frame using the same mechanism that we have seen now in the frames, stone comes
up in the cache.
Q The frame from laptop E it'll be relayed to laptop B.
And Laptop B, send an acknowledgement back to the access point thing that, hey, dude, I have received
an acknowledgement, I received a frame from you.
So this is the acknowledgement and all of the stations must again remain silent.
So this was the walking of C as MFC, a matter contention method for wireless networks.
Now, if we haven't understood the walking, I recommend you to go back and see the video again so that
we have a clear shot at CSM committed.
Again, if you have any doubt, please feel free to ask us in the Q&A section where we'll try to answer
your questions within 48 hours.
And again, if you're enjoying this course, I really request you to please leave a rating for our course.
You can see the rating tap on the right hand top corner of your laptop or website.
If you're using a laptop machine in the next lecture, we will see a different contingent method which
is used for a wired network.
And I hope you understand the difference between these two mechanisms.