If your PC or Laptop is password protected, you have to enter the password before enter in computer. And once if you admitted in computer by providing the correct administrator password, then you don’t need to provide old password to change the admin password. It can be possible only by using command prompt.
Everyone wants that nobody use his/her computer without permission. For this you can protect your computer with administrator password.
Wireless network security is very essential issue that we should be very carefully applied while establishing a WiFi connection. Because wireless network is not connected through wires whereas we all know that it is connected through radio waves.