Firewalls
Security-related network devices and software have undergone many generations of improvements since they were first introduced several decades ago. Firewalls have undergone perhaps the greatest changes, evolving from simple packet-filtering devices into devices that can perform advanced analysis of Application Layer traffic. Firewalls have become an increasingly important component of network security. As an information security professional, it is important for you to have a firm command of this technology.
Firewalls separate networks and organizations into different zones of trust. If one network segment has a higher level of trust than another, a firewall can be placed between them as the demarcation point between these two areas. ...
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