Datajam.com is a mobile speed testing site for WiFi users. It also has consumer friendly technical information for all types of 2-way wireless digital connectivity. Datajam explains the difference between 1 way broadcast reception over licensed spectrum to 2 way wireless connectivity over unlicensed spectrum.
Datajam was designed as a consumer friendly site to help a non technical person figure out if a slow WiFi connection or NetFlix freeze is the fault of the ISP? or the location? the distance from the Wifi transmitter (the Wifi Router the access point or Hotspot) or from other interference?
How to provide simple advice Step #1 – Step #2 simple things consumers can do before calling tech support :
Check the location of the Wifi Router it may have been moved. there may be something blocking the ability to send to transmit
Power on and off the router – this means – unplug it and wait for about 1 minute before plugging it back in.
Clearly if you are in dorm room, or a class room with no access to the Wifi Access Point (the transmitter,the thing with the green lights and the antennas that may have a label Lynksys, D-Link, Netgear) this will not work.
Wifi interference and conflicting Wifi transmitters on the same channel are a big issues. The differences between 2.4Ghz and 5Ghz Wifi is a complicated topic.
Real security over Wifi is very difficult. Be very careful with public wifi.