The Domain Name System is the Internet’s standard naming service. DNS is responsible for mapping domain names to addresses, addresses to domain names, and a good deal more. Virtually all non-trivial Internet applications—and this includes applications that run over TCP/IP-based corporate internets such as Web browsing, email, CRM, ERP, Active Directory, and others—rely on DNS. Without DNS, work on the Internet stops, just as surely as it does in the event of a cable cut or routing problem.
Unfortunately, DNS is now an old protocol. It dates to the early 1980s, when the Internet was in its infancy. And while DNS has been tremendously successful at accommodating the exponential growth of the Internet, it was not designed to operate in an environment as hostile as the Internet of today. Consequently, DNS lacks critical security features, such as authentication and integrity checking.
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