Shulou(Shulou.com)06/03 Report--

DNS name resolution

DNS (Domain Name System), which is located at the application layer of the TCP / IP protocol family, is a naming system for computer and network services organized into a domain hierarchy, which provides services used to translate host names and domain names into IP addresses.

So why doesn't QQ need DNS for domain name resolution?

In daily life we sometimes encounter this situation, such as the use of QQ normal Internet access, but how to browse the web page can not open? What was going on?

Under normal circumstances, browsing the web page does not use WWW mode, direct access to the IP address of the website is also through, with the URL access mode is to first find the IP address of the server corresponding to the URL, and then use IP access, if DNSC failure, it does not know where to go, qq message is directly transmitted through IP using UDP protocol of the transport layer, do not need to wake up the domain name resolution, so DNS even if the failure does not affect the normal message sending and receiving.

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