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This article will explain in detail about DNS domain name resolution for everyone. The content of the article is of high quality. Therefore, Xiaobian shares it with everyone for reference. I hope that after reading this article, you will have a certain understanding of relevant knowledge.

The process of network access is inseparable from DNS resolution system. In the process of resolution, it is also divided into many links. Through layer by layer decomposition, the one-to-one correspondence between domain names and IP addresses is realized.

DNS domain name resolution process

The DNS service module of the local device initiates a query request, and then submits it to the network operator DNS (Local DNS) for query through routing. If there is a cache record saved after the query by other users in the DNS cache of the network operator, it can immediately return to inform the local device of the IP address of the domain name requested to access.

However, due to the different hobbies and habits of each person, there is no record of the current request to access the domain name in the DNS cache of the operator. At this time, the DNS server of the operator will initiate a layer by layer query request to the superior DNS server, in which the content responsible for each level has different division of labor.

13 top-level DNS servers (root servers) in the world: IP addresses of domain name servers that store all suffixes, and IP addresses of corresponding domain name servers are queried according to domain name suffixes.

Domain name server: stores registration information of all domain names and NS server addresses. According to NS addresses recorded in domain name registration information, find IP of DNS resolution server (authoritative DNS) providing domain name resolution service.

Authoritative DNS: stores all domain name resolution records that provide resolution services, and can directly query the resolution record values added by accessing domain names.

Operator DNS: according to the user's resolution access request, initiate a query request to the superior DNS resolution server, and then inform the requesting device of the address of the domain name resolution record finally queried.

Theoretically, every time you use a computer browser or operate an APP application, you need to initiate a domain name resolution query request to DNS, and you need to go through the query response of the entire DNS resolution system. According to the final result, you can obtain web content or game data, video images, beautiful music, etc. from the target server.

As an intermediate station directly facing users to access devices, operator DNS will receive various domain name resolution query requests all the time in daily life, and many times there will be multiple consecutive people initiating resolution query requests to the same domain name.

If you follow the DNS resolution system's process every time and check all DNS servers to get the final resolution result, it will take a long and meaningless time. In order to reduce this kind of operation, DNS operators store the domain name results obtained from each superior query to the DNS server, so that the next time there is a query request for the same domain name resolution, this result can be called to respond.

About DNS domain name resolution to share here, I hope the above content can be of some help to everyone, you can learn more knowledge. If you think the article is good, you can share it so that more people can see it.

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