Server: How Does DNS Work?

This updated guide examines Server: How Does DNS Work? and organizes the essential facts, background, and practical takeaways in clear American English.

On a larger scale, computers connected to the internet use DNS to create URL link addresses (Universal Resource Locators). Under this method, each computer will not need to use the IP address for the connection, but simply use the domain name (domain name) to query the connection. With hierarchical model as shown below:

Domain hierarchy model

To better understand the operation of DNS we consider the example and refer to the drawing below:

Active example of DNS:

• Assuming PC A wants to access the website www.yahoo.com and the vvn server has not saved information about this site, the query steps will take place as follows:
• First, PC A sends a request to the domain management server and asks for information aboutwww.yahoo.comDomain name management server sends a query to the top level domain server.
• Top level domain stores information about all domains on the network. Therefore it will send back to the server managing the domain name and IP address of the domain management server com (calling server com off).
• When the IP address of the domain name server is managed, server vnn immediately asks com server for information about yahoo.com. Server com manages all the websites that have com domain, they send information about the IP address of yahoo.com server to the server.
• Now the server vnn already has the yahoo.com IP address. But PC A requires www service, not ftp service or any other service. So the server continues to query to the yahoo.com server to request information about yahoo.com's www service management server.
• Naturally, when receiving a query, the yahoo.com server sends it back to the server and the IP address of the management server www.yahoo.com.
• Finally, the server will send the IP address of the management serverwww.yahoo.com. for PC A and PC A to connect directly to it. And now the server vnn has information aboutwww.yahoo.comfor future queries of other clients.