Browser dictionary: DNS pre-read

DNS pre-read DNS Prefetch): a browser acceleration technology.

DNS is short for Domain Name System. It is a computer and network service naming System organized into a Domain hierarchy. DNS naming is used for TCP/IP networks, such as the Internet, to locate computers and services with user-friendly names. When you enter a DNS name in an application, the DNS service can resolve the name to other information related to the name, such as the IP address.

For example, most users prefer to use friendly names to locate computers such as email servers or Web servers on the network. Friendly names are easier to remember. However, the computer uses a digital address to communicate over the network. To make it easier to use network resources, such as DNS name service provides a way to map user friendly computer or service names to digital addresses. If you have used a Web browser, DNS should also be used.

Generally, you can enter a URL such as www.51cto.com in the browser. After the URL is submitted, the browser submits a query request to the DNS server, finds the IP address information for the URL, and returns the IP address, for example, 118.144.78.38 ). The speed of this process depends on the DNS server location and other factors.

DNS pre-reading means that when the browser parses the URLs contained on the webpage during page loading, before the user accesses them, resolve the host names after these URLs in the background. When the page is loaded or the user clicks these URLs, the corresponding DNS resolution work has been completed in advance and DNS resolution will not start until the user clicks. If DNS resolution is slow, users can feel that DNS resolution is accelerating. Thank you for your explanation ).

Reading

Once the DNS server is attacked or encounters a fault, it will paralyze the entire network. Similar cases include: