A firewall is the first program to receive data stream from the Internet. It is also the last takeover program data to go outside. Like a security worker, standing at the door of the building, determine whether or not the permit comes in and goes out. Usually, there is one important thing that you need to protect yourself before the unreliable connections from the Internet and the internal network, we are bringing the risk of hackers or viruses invading your computer. Monitoring the connection comes from your computer is equally important, however, the reason there are a bit more complicated part.
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