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In network security perimeter defences such as firewalls are used to block the bad guys out and allow the good guys in. And congratulations on taking your very first step towards becoming a security engineer. A beginners guide to network security an introduction to the key security issues for the ebusiness economy with the explosion of the public internet and ecommerce, private computers, and computer networks, if not adequately secured, are increasingly vulnerable to damaging attacks. Computer networks that are involved in regular transactions and communication within the government, individuals, or business. Learn the eight fundamental principles that underlie all security efforts, the importance of filtering input and controlling output, and how to defend against the most common types of attack.
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