In my experience you need to have at least a foundational understanding across the entire stack. I'm guessing OP had some experience in the past with AWS, DNS,

In my experience you need to have at least a foundational understanding across the entire stack. I'm guessing OP had some experience in the past with AWS, DNS, web development, etc. From there he might of needed to do a bit of research here and there, but he probably had some idea what was needed and where to go for that information.