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Network firewalls prevent unknown programs and Internet processes from having access to the system protected; they are not antivirus systems as such, and make no attempt to identify or remove anything, but may protect against infection from outside the protected computer or LAN, and limit the activity of any malicious software which is present by blocking incoming or outgoing requests on certain TCP/IP ports. Hence, a firewall is designed to deal with broader system threats that come from network connections into the system, and is not an alternative to a virus protection system.
Sourece : http://en.wikipedia.org/wiki/Antivirus_software#Security_Concept
Posted in: antivirus
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