DNS

DNS is the heart of the internet. If DNS is unavailable, each one of us will have a hard time finding resources on the internet. Being a massive phonebook of the internet, our entire online system relies heavily on DNS. Because of DNS namespaces, none of us have to remember a list of IP addresses; instead, we just have to remember the names of web pages.

For IT and security professionals, it is important to understand the basic structure, function, and operations of DNA. It is a hierarchical database with delegated authority. As per the scope of this chapter, we will be consider enterprise DNS deployments and its functions. There are two ways organizations can manage their DNS infrastructures: by allowing their Internet Service Provider (ISP) to manage it or by managing it internally. Any configuration mistakes or failure in the ISP network can turndown the organization's internet infrastructure.

With the growing number of internet users, DNS became the backbone of organizations on the...