I understand that these days CSMA/CD i.e. ethernet one isn't used at all because we have full duplex network. Thus, there is no chance of collision here. Also, we don't use hubs anymore. Each switch port has a different collision domain. The question is in Wifi world – is CSMA/CA – collision avoidance is useful or not. I believe in 802.11 there is no concept of duplexity so how does it work?
Is CSMA/CA used in Wifi technology
ieee 802.11ieee-802.3x
Related Solutions
If you want to know which AP your computer is connected to. You have two options.
Use inSSIDer to investigate your wireless network. The network that you are connected will be indicated by the green wireless icon.
2 . Use built-in netsh command in Windows 7 or Windows 8 To do so, go to your Command Prompt that you can find in Accessories or click on the Windows button (Windows 7) or press Windows button on keyboard (Windows 8), and then type cmd
Command Prompt will be listed in front of you. Click on it and type the following command line
netsh wlan show interfaces
What you need to focus on is BSSID value. This is the MAC address of the AP that you are being connected. Now you can go check the MAC address on the APs’ information label to find out which one you are connected to.
please check thise link Which Access Point am I connected to?
Finally found out that in Wifi, CSMA is the one used to allow Multiple Access. To be exact, IEEE 802.11 releases use CSMA/CA (Collision Avoidance) instead of CSMA/CD (Collision Detection) which is used in wired networks.
OFDM, on the other hand, is just an advanced digital modulation scheme which divides the data stream being exchanged between the node and the AP to multiple individual streams of lower rate and transmits them on different, closely-spaced carrier frequencies simultaneously (multiplexing). Making the signal more robust against error--thus allowing higher data rates--is what OFDM does in a nutshell.
Best Answer
CSMA/CA is used with Wifi and it's useful. Since "air" is generally a shared medium, no two stations must transmit simultaneously. Collisions are possible and need to be avoided/handled with.
"How does it work?" is much too broad to answer here.
With full-duplex links, no collision handling is required at all since there can be no collisions.