Bluetooth is protected by a password where you have to connect with someone and the a password that comes up on booth phones that you have to put in. WiFi is like Bluetooth you have to have a private password to be connected to it. Most people have a password to stop people from hacking in and is also incripted.
Firewall: a technological barrier designed to prevent unauthorized or unwanted communications between computer networks or host.
Encrypting:using a secret code so as to be unintelligible to unauthorized parties.
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