Chapter 4. Using a Firewall

Security has never been more critical when administrating client and server systems.

Today’s external threats range from macro viruses embedded in documents and spreadsheets, to denial of service network attacks. All networked systems are potentially vulnerable to probes and attacks—intentional and unintentional—as assailants constantly scan systems connected to the Internet. However, attacks can also come from internal sources. In 2008 and 2009, the greatest number of reported data breaches actually ...

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