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Cisco Router Firewall Security by Richard A. Deal

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Chapter 1. Security Threats

With the increase of hacking attacks, worms, viruses, and other networking threats, security is a major problem in today’s networks. 10 to 15 years ago, security was a simple problem requiring simple solutions; in those days, the Internet was small and had only a small number of universities and government agencies connected to it. Aging passwords were used to protect accounts, and simple packet-filtering firewalls were used to restrict traffic flows. However, today is a different world from more than a decade ago. With the explosion of the Internet, the proliferation of software applications, and the ingenuity of hackers, security has become a complex problem that requires a well-thought-out security solution to deal ...

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