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Chapter 8
Security Threats
The ability to counter security threats requires an understanding of those
threats, which is the objective of this chapter. This chapter focuses attention
on a variety of threats to both computers and the networks to which they are
connected. Security threats to be examined include password cracking, net-
work scanning, viruses, worms, and techniques that are used to deny service
to legitimate users, the latter categorized as denial-of-service attacks. Informa-
tion presented in this chapter can be considered to form a foundation for
additional security-related material presented in Chapter 9, which focuses on
techniques ...