As we all know, the DNS server plays an extremely important role in network access. It converts URL domain names into IP addresses for device access. Now that the DNS server can take on the task of converting the URL domain name to the IP address, can the DNS server accelerate our network access speed?
Case 1: If the server has multiple IP addresses
When a website has multiple servers deployed for business needs, and the IP addresses of these servers are different, the DNS server will return all these IP addresses to our computer when responding to DNS queries. Usually, our computer will select the first IP address for access. In other words, in this case, the delay of our access to the website depends on the network delay from our first server.
Figure 1: If the server has multiple IP addresses
If we are unlucky and the computer happens to choose the worst address, we will have the worst Internet experience. Fortunately, the servers of the websites we want to visit are all in the same city, and our visit experience to different servers should not be bad.
Case 2: If the servers are distributed in different places
The situation is getting worse now. There is a city where a server is located thousands of kilometers away from our residence. At this time, if our computer chooses the farthest server, it is conceivable that the network access experience will definitely deteriorate.
Figure 2: If the servers are distributed in different places
Case 3: If the servers are distributed in different operator networks
The situation is getting worse and worse. In order to provide the best experience for different ISP users, the server is designed to deploy one in each ISP network.
Figure 3: If the servers are distributed in different operator networks
At this time, if we, unfortunately, choose a server that is not in the same ISP as ours, because different ISPs often communicate data through several fixed interface computer rooms, this will cause the traffic we access to the server to loop back and forth. This situation often leads to a terrible experience.
Case 4: Different DNS servers
What kind of experience will we have when we choose different DNS servers?
Suppose we live in City A, and the DNS server we set up is City B, which is thousands of kilometers away. Obviously, each of our HTTP requests will be forwarded to City B's DNS server, and then City B's server will return the server's IP address, which is obviously worse than our choice of City A's DNS server.
Figure 4: Different DNS servers
Case 5: Will different DNS servers affect our network download speed?
The answer is obviously no. As said at the beginning, the DNS server is only responsible for resolving the server IP address corresponding to the URL for us. Our download rate depends on the bandwidth provided to us by the ISP, and the DNS server has no impact on this.
At the bottom
Obviously, the choice of DNS server will affect the speed of our website visits;
The choice of DNS server will not affect our download rate;
When setting up DNS, you can try to ping the DNS server address and choose a DNS server with the least ping delay as the primary DNS, which may bring you a better experience.
