Abstract
This chapter outlines steps necessary to secure networks through network controls. These network controls are either software or hardware based and are implemented in a hierarchical structure to reflect the network organization. This hierarchy is superimposed on the network from the network's perimeter to the access level per user of the network resources. The functions of the network control are to detect an unauthorized access, to prevent network security from being breached, and finally, to respond to a breach—thus the three categories of detect, prevent, and respond. Securing available resources on any corporate or academic data network is of paramount importance because most of these networks connect to the Internet for commercial or research activities and the network is under attack from hackers on a continual basis, so network security technologies are ever evolving and playing catch-up with hackers. Around 20 years ago the number of potential users was small and the scope of any activity on the network was limited to local networks only. As the Internet expanded in its reach across national boundaries and as the number of users increased, potential risk to the network grew exponentially. Over the past 10 years e-commerce-related activities such as online shopping, banking, stock trading, and social networking have permeated extensively, creating a dilemma for both service providers and their potential clients, as to who is a trusted service provider and a trusted client on the network. This being a daunting task for security professionals, they have needed to design security policies appropriate for both the servers and their clients.
Published Version
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