The user enters the website address from the browser, to see the complete process of the website:
The first step: the user in the browser input https://ke.qq.com/course/28714 website address, carriage return, the system will first query the local DNS cache and Hosts file information, determine whether there is a need to exist https://ke.qq.com/course/ 28714 corresponding IP resolution record, if there is a direct access to the address, then go to the IP corresponding to the domain name www.ke.qq.com server and find https://ke.qq.com/course/28714.
The second step: If the client local DNS cache and the Hosts file does not have https://ke.qq.com/corresponding parsing record, then the system will send the browser's resolution request to the client local Settings DNS server address resolution, If the local DNS server's local cache has a corresponding resolution record, it will return the IP address directly to the client. If not, the local DNS will continue to request additional DNS servers.
In the third step, the local DNS server requests the https://ke.qq.com/course/domain name from the root of the DNS system and makes a series of lookups for each hierarchy of DNS server systems. Finally find the qq.com domain name corresponding to the authorized DNS server, two authorized DNS server official enterprise purchase domain name when used to manage the domain name parser. The corresponding will parse the record with ke.qq.com IP. If not at this time, it means that the company's domain name manager does not do a domain name resolution for this site.
Fourth step: ke.qq.com domain authorized DNS server will send ke.qq.com/to the final IP resolution record to the local DNS server
The fifth step: The local DNS server sends the IP resolution record from https://ke.qq.com/to the client browser and caches the name and IP corresponding resolution for quicker access next time.
The sixth step: the client browser obtains the https://ke.qq.com/website to use the IP address, next the browser will request obtains the IP to use the website server, the website server responds after the customer request content https://ke.qq.com/course/ 28714 returns to the client browser, ending the access request.
Next, please click on this website https://ke.qq.com/course/28714 and then carefully recall the process, for the next interview can explain the process clearly.
Basic process for users to visit the site
