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Network security is one of the tasks of network management, other aspects of which we deal with in the next chapter. However, network security is such an important issue that this chapter is devoted to it. The chapter starts with an explanation of several important security concepts and gives some security techniques related to these concepts. We examine the following aspects of network security in turn: virtual private networks (VPNs); firewalls; intrusion detection, intrusion prevention and unified threat management systems; various kinds of attacks that may be made on networks; viruses, worms and Trojan horses; rootkits; spam e-mail; spyware; phishing; social engineering; dynamic Web links; and physical security. Wireless networks receive detailed coverage in Chap. 10, but there is a section on wireless LAN security in this chapter. Finally, we consider the security of mobile devices.
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