Following are the Servers which have been used;
1. Web server.
2. Email server.
3. DNS server.
4. VPN server.

Web server
A computer, including software package that provides a specific kind of service to client software running on other computers. A Web server is a server-based product that returns files to clients when requested. These files are typically returned in the form of Web pages to a client internet browser.
Most of the web servers are built for the java community, and some are open source like Apache. A web server handles the HTTP protocol. When a request comes into the Web server, the Web server simply passes the request to the program able to handle it. The server side program usually provides for itself such functions as transaction processing, database connectivity, and messaging.

Email server
Email server works as a postal address an email …show more content…
You can send the same message to several people at the same time. You can forward information to co-workers without retyping it. You can save time. Email is fast, usually taking no more than a few minutes to be received. You can email electronic documents and the recipients can then edit and return revised versions. You can send messages around the world as easily as to co-workers in the next office or anywhere.

DNS server
The term DNS stands for “Domain Name System.” A globally distributed, scalable (scale), reliable, dynamic database. The internet is based on IP addresses, not domain names. IP addresses are convenient for computers (IP address includes information used for routing). IP addresses are tough for humans to remember. Domain names comprise a hierarchy so that names are unique, easy to remember.
A domain is an arrangement of client and server computers that act together as one system. A domain name is key to doing just about anything on the internet, from setting up a website to sending and receiving email to building an online