Firewall is a computer program for computer protection that works on the principle of filtering incoming and outgoing communication. Its function is important for computers that are part of a network – especially if there is a risk of communication with untrustworthy computers (e.g. Internet)
Alternatively, it can also be a hardware device shielding the whole network or its part. However, in that case it might not be able to protect the stations in network from wireless communication by-passing the firewall.
The rules by which firewall filters the communication are usually set by the network administrator.
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