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What is the process for users to visit the website, many novices are not very clear about this, in order to help you solve this problem, the following editor will explain for you in detail, people with this need can come to learn, I hope you can gain something.

The user enters the address of the website from the browser to see the complete process of the website:

Step 1: enter the address of the www.baidu.com website in the browser and enter. The system will first query the local DNS cache and hosts file information to determine whether there needs to be an IP resolution record corresponding to www.baidu.com. If so, obtain the address directly, then visit the server of the domain name www.baidu.com corresponding to the IP and find www.baidu.com.

Step 2: if there is no resolution record of www.baidu.com in the client's local DNS cache and hosts file, the system will send the browser resolution request to the DNS server address resolution set locally by the client. If the local cache of the local DNS server has the corresponding resolution record, it will directly return the IP address to the client. If not, the local DNS continues to request other DNS servers.

In the third step, the local DNS server requests the resolution of the www.baidu.com domain name from the root of the DNS system, and makes a series of searches for all levels of DNS server system, and finally finds the authorized DNS server corresponding to the qq.com domain name. Second, the authorized DNS server is used to manage the domain name when the authorized DNS server officially buys the domain name. The corresponding will parse the record with baidu.com IP. If not at this time, it means that the company's domain name manager has not done a good job in domain name resolution for this website.

Step 4: the DNS server authorized by the baidu.com domain name will send the final IP resolution record corresponding to baidu.com to the local DNS server

Step 5: the local DNS server sends the IP parsing record from www.baidu.com to the client browser, and caches the name and the parsing corresponding to IP so that it can be accessed faster next time.

Step 6: the client browser obtains the IP address of the www.baidu.com website, and then the browser requests the website server for the IP counterpart. After responding, the website server returns the content of the customer request to the customer browser and ends the access request.

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