1)http://en.wikipedia.org/wiki/Firewall_(computing) or
http://netforbeginners.about.com/od/f/g/def_firewall.htmor
http://www.webopedia.com/TERM/F/firewall.htmlor
http://searchsecurity.techtarget.com/definition/firewall
2)http://www.webopedia.com/DidYouKnow/Internet/2004/virus.asp
http://www.streetdirectory.com/travel_guide/157367/security/what_is_the_difference_between_a_worm_virus_and_trojan_horse.html
http://www.symantec.com/business/support/index?page=content&id=TECH98539
http://netforbeginners.about.com/od/f/g/def_firewall.htmor
http://www.webopedia.com/TERM/F/firewall.htmlor
http://searchsecurity.techtarget.com/definition/firewall
2)http://www.webopedia.com/DidYouKnow/Internet/2004/virus.asp
http://www.streetdirectory.com/travel_guide/157367/security/what_is_the_difference_between_a_worm_virus_and_trojan_horse.html
http://www.symantec.com/business/support/index?page=content&id=TECH98539
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