DNS is fundamental to the workings of the Internet. Without DNS name resolution, the Internet would not exist as it does today. Understanding DNS, on the other hand, is not as basic.
To assist with your understanding of DNS, our team here at Dyn has put together several blog entries that should get you started.
Everything You Ever Wanted To Know About TTLs
How to Switch Managed DNS Providers in Five Easy Steps
Recursive DNS, Round Trip Times, Delegations & DNS Performance
In addition to these blog entries, we have several videos about our Managed DNS product. You can watch via the links below.
Video Tutorial: Create your first Zone
Webinar Series: DNS Performance and Security
Advanced DNS Feature: Active Failover