Server Configuration

Server is a computer program that provides services to client software running on computers.
Types of Server:

1. Web Server
2. Proxy Server
3. Mail Server
4. DNS (Domain Name System) Server
5. Database Server
6. File Server

 Web Server provides content such as web pages using HTTP (Hyper Text Transfer Protocol) over the WWW (World )
A DNS Server runs special-purpose networking software, features a public IP address, and contains a database of network names and addresses for other Internet hosts. 

DNS servers communicate with each other using private network protocols. All DNS servers are organized in a hierarchy. At the top level of the hierarchy is root servers. Root servers store the complete database of Internet domain names and their corresponding IP addresses. There is 13 root servers contain the complete database of domain names and IP addresses. Ten of these servers are in US.