How to determine which WiFi technology is currently used in connection?

Just press Ctrl+Alt+T on your keyboard to open Terminal. When it opens, run the command below:

sudo lshw -class network

If you get no response, you may need to install lshw on your system. You can install it by typing:

sudo apt-get install lshw 

I donot know if this is what you are looking for but you can get further information regarding wireless connection from iwconfig. Just do iwconfig WIRELESS_INTERFACE e.g iwconfig wlan0. You can also run iwlist WIRELESS_INTERFACE OPTIONS, see man page of iwlist for available options. According to man page they both retrieve information from /proc/net/wireless