Network Security Threats

Security threats come in a variety of forms for a SOHO LAN. These threats vary from simple unauthorized access on the PC hosts; to virus and malevolent software attacks on PC hosts; to spyware observing, collecting, and reporting on user activity; and finally to direct attacks by hackers from the Internet.

The most common threat is from malevolent software sent as a package or attachment to e-mail; e-mail itself is basically text messages. Such malevolent software is commonly labeled virus software. By strict definition a virus is a program that hides itself as part of another program. In this book we use the term virus in both senses, as a general identifier of malevolent software and in its purer form as a program that ...

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