DNS is the Domain Name Service, the telephone book of the internet.
The need to remember IP numbers is difficult, so DMS was creeated.
While some may say that everything is a DNS problems, these problems can be solved.
Basic DNS Training
The training goes over the different DNS servers and how to set them up.
Then the structure of zone files and the different records that can be used.
The training goes further into detail on how additional records can be used to hold additional data.
Advanced DNS Training
The training goes into how to optimize DNS servers and how to create a HA servers.
It shows how to use dynamic DNS, how to use different backends to generate or store DNS data. It also goes into how to setup and maintain DNSSEC.