What is the role of DNS? Why you must configure DNS to surf the internet

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DNS is the abbreviation for the domain Name System and is a core service of the Internet as a distributed database that maps domain names and IP addresses to each other, making it easier for people to access the Internet without remembering the number of IP strings that can be read directly by the machine. This is also the official statement of DNS.

Today we are in the vernacular way to give you more image of the role of DNS and why must be set up DNS to access the Internet.

The role of DNS: in the Internet, In fact, there is no similar to www.xxx.com this domain name, and instead of the IP address, such as 222.222.222.222, then we should enter in the IE Address bar 222.222.222.222 to open the site www.xxx.com, but we think about the internet on the site thousands, such as Every site to log on the need to remember a large number of numbers, it is not particularly inconvenient, for the memory is not strong people, simply can not remember such cumbersome figures. This time the DNS appears, it is the role of 222.222.222.222 to www.xxx.com, then we log in when the direct input domain name can be.

Why you must set up DNS to surf the Internet. Some friends may find out, why I may land QQ, MSN, but can not open the page. In fact, most of the reasons are due to DNS server failure, the DNS server address is unique, is the operator provided to end users to resolve the relationship between IP address and domain name, and if you do not set the DNS server address, then can not query the whereabouts of the address, nature will not open the page, and QQ, MSN and other Instant chat software, the use of UDP transmission protocol, that is, unreliable transmission protocol, no need to provide DNS server address, also can login.