Many of us would already know what a DNS is but for starters, it is the thing that converts the URL to IP address when we to hit a URL. The part I want to focus is how underrated and much unknown is this system to people apart from the fact I mentioned above. In fact, I am lucky enough to get an in-depth look at how crucial DNS system and how it forms the backbone of highly scalable distributed system where you agree to an SLA for some milliseconds or might less at InMobi. So this post is more focused towards starters and not so fancy because that's how it should be understood. Why is DNS important ? Imagine you have to deploy a service on the internet and you agree to your consumers for 100 or 200 ms latency but an improper DNS setup or DNS query can add 200ms or up of latency and added to that your geolocation.Hence it becomes important to tune your DNS server to your need.Let's get into details. This is a very high-level view of things and people should explor