DoS and DDoS (denial-of-service and distributed denial-of-service) attacks, which prevent legitimate users from accessing and using a site or particular service, have become a growing concern as more and more businesses move onto the Internet. Last year, retail giant Amazon.com, electronic . . .
DoS and DDoS (denial-of-service and distributed denial-of-service) attacks, which prevent legitimate users from accessing and using a site or particular service, have become a growing concern as more and more businesses move onto the Internet. Last year, retail giant Amazon.com, electronic auction house eBay, discount retailer Buy.com, CNN Interactive, and the portal Yahoo! made headlines when they were the recipients of these attacks, and now smaller businesses are beginning to recognize the dangers these attacks pose, too.

Until managed availability monitors have been perfected, site owners need to take specific steps to ensure their systems are protected from DoS/DDoS attacks. In seeking to prevent DoS/DDoS attacks, every Web site has four areas of vulnerability: the gateway, the host, hardware/software, and personnel. The following recommendations address these four areas

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