What is the DNS?

The Domain Name System (DNS) is a decentralized naming schema of resolving domain (host) names into numerical IP Addresses. The IP Addresses are assigned to various computing devices and services on the Internet but because remembering a series of numbers is more difficult for people, it's easier to remember them by their corresponding domain names and have the DNS translate it into the relevant IP address. In this way, the DNS is equivalent to a telephone directory where you would look up a person's telephone number by their name. This is accomplished by having the DNS map domain names to the aforementioned Internet resources by giving authoritative name servers (Top Level Domain name servers) for each domain. This then allows network administrators to create their own sub-domains on their domain and have them connect to other name servers; thus, allowing for a decentralized, fault-tolerant, and distributed database. As this is the DNS main purpose, the handling of the domain name hierarchy namespace and IP Address translations, it is an integral part of the Internet communication at the Application Layer of the Internet Protocol Suite.[..]

What is an Intranet?

The term intranet is a comprised of two words: "Intra" means internal and the "net" represents the network. The Intranet, therefore, can be defined as the internal network. It is a private network with access limited to the authorized users only. The Intranet can be as simple as a private website or it can be as big as a private organizational infrastructure, accessed by only the authorized users. The intranet may not necessarily be connected to the Internet but they usually do. In typical intranet architecture, there are specific computers in a defined parameter where each computer in the intranet plays a specific role to provide common tools and features to every computer connected to the intranet. There are vendors that provide the intranet portal software like Share Point, Igloo and Huddle.[..]