This is a classic topic, when opening the browser, enter the address (http://google.com), the browser will "ask" the network (exactly the query DNS server) google.com the corresponding IP address is what? If the DNS server knows the IP address you are looking for, it returns the result, and if you do not know it, forwards the request to the other DNS server until the corresponding IP address record is found on a DNS server. After the DNS server returns the IP address of the computer you want to access, it requests the page that corresponds to the IP address that you want to access. Now that the computer knows which IP address to access to http://google.com, it will request HTML from Google's server to display the page. When the remote server sends the HTML document back, the browser renders the document. Rendering is a series of actions that allow HTML pages to be displayed in a defined way at the beginning of the design.
What happens when you open a browser input URL