In this lecture dealt with some of the protocols used on the Internet are based applications . In detail in this lecture addressed : - HTTP protocol as a free state protocols , message formats , etc. REQUEST and RESPONSE - FTP protocol - Protocol DNS , root hints, translation of names ( name resolution ) , areas forward and reverse zones and utility nslookup - SMTP protocol , SMTP messaging format , the exchange of messages between the server and the client to the server

What is http

The Hypertext Transfer Protocol (HTTP) is an application protocol for distributed, collaborative, hypermedia information systems.HTTP is the foundation of data communication for the World Wide Web. Hypertext is structured text that uses logical links (hyperlinks) between nodes containing text.

What is FTP

The File Transfer Protocol (FTP) is a standard network protocol used to transfer computer files between a client and server on a computer network. FTP is built on a client-server model architecture and uses separate control and data connections between the client and the server.

What is DNS
DNS server is any computer registered to join the Domain Name System. 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.

What is SMTP
The Domain Name System (DNS) and SMTP mail routing. TheDomain Name System (DNS) is a directory used by SMTP to convert a name, such as, to a list of servers that can receive connections for that name and to find the IP address of a nspecific server.

What is WWW
The World Wide Web (WWWisan information space where documents and other web resources are identified by URLs, interlinked by hypertext links, and can be accessed via the Internet. The World Wide Web was invented by English scientist Tim Berners-Lee in 1989.
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