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SSID stands for service set identifier. When you set up a wireless LAN at your home using an access point, the name of the network is called SSID. Any broadband router comes with a predefined default SSID. You need to change default SSID because to avoid confusion, ensure higher security
WPA is a standard security protocol for wireless local area networks (WLANs). WPA was released in 2003 as an improvement on WEP. WPA2 is an extension of WPA and was released in 2004. The difference between WPA & WPA2 lies in the way security keys are generated and encrypted.
A wireless key is a type of security password exchanged between a router and a wireless client. This key is used to ensure the authenticity of the devices that are connected to a network. Different standards, such as WEP, WPA & WPA2, have been developed by Wi-Fi alliance that uses a wireless key.