References

http://www.webopedia.com/TERM/f/firewall.html

http://www.cerias.purdue.edu/about/history/coast_resources/firewalls/

http://csrc.nist.gov/publications/nistbul/csl94-01.txt

William Stallings, 2005, Operating systems.

http://www.atis.org/tg2k/_network_security.html

 http://rf-web.tamu.edu/security/secguide/V1comput/Threats.htm

http://csrc.nist.gov/publications/nistbul/csl94-01.txt

University of east London school of computing and technology. System Integration (CNM009) Lecture Manual.