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Understanding DNS

An extremely important part of managing IP networks is understanding the Domain Name Service. The Domain Name System (DNS) provides a hierarchical name resolution strategy for resolving a Fully Qualified Domain Name (FQDN) to an IP address. DNS servers provide this “friendly name” to logical address (the IP address) resolution on TCP/IP networks such as the Internet. For example, when you type Microsoft.com into your Web browser address window, a DNS server somewhere on the Internet actually resolves the FQDN (Microsoft.com) to the IP address of the Microsoft Web site.

So in terms of TCP/IP networks and the Internet in particular, each organization will deploy DNS servers that provide FQDN resolution to IP addresses. In effect, each large company, organization, or service provider manages the name resolution duties for their own portion of the Internet. In fact, when a company registers a domain name with InterNIC, the company must provide the IP addresses of two internal DNS servers that will handle the name resolution duties for that domain (for individuals that register a domain name, the DNS server addresses are typically provided by your service provider).


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