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How dynamic DNS resolution is done

Source: Internet
Author: User
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How is Dynamic DNS resolution done?
This question is not related to PHP, but I don't know which section is appropriate.
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If you ping some large websites, such as YOUKU.COM,GOOGLE.COM.HK, you will see different IPs after each resolution. This is the legendary load balancer?
So what technology is it implemented?

------Solution--------------------
DNS polling, you can resolve a domain name to n IP addresses

And now CDN Technology is also the case, multiple front-end
------Solution--------------------
Automatically distributes the most recent fastest servers based on the server's load. I didn't get this high-end thing.

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