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TCP/IP Configuration DNS (Domain Name System) DNS stands for Domain Name System; it's a critical service that provides translation between a domain name and its IP address. One of the things you'll learn is what a Fully Qualified Domain Name (FQDN) is and how it translates a human name into what a computer system understands, and why it reads the address backwards or right-to-left. You'll also learn what is met by root domain, and how you distinguish it from other information such as names that follow the slash (/1234…).