give a short description on TCP (transmission control protocol), http (hypertext transfer protocol), FTP (file transfer protocol), and AP (Internet message access protocol), and (simple mail transfer protocol )SMTP ,
Answers
Short for Hypertext Transfer Protocol, HTTP is a set of standards that allow users of the World Wide Web to exchange information found on web pages. When accessing any web page entering http:// in front of the address tells the browser to communicate over HTTP.
TCP (Transmission Control Protocol) is a standard that defines how to establish and maintain a network conversation via which application programs can exchange data. TCP works with the Internet Protocol (IP), which defines how computers send packets of data to each other.
File Transfer Protocol (FTP) is a standard Internet protocol for transmitting files between computers on the Internet over TCP/IP connections.FTP is a client-server protocol that relies on two communications channels between client and server: a command channel for controlling the conversation and a data channel for transmitting file content.
SMTP is an application layer protocol. The client who wants to send the mail opens a TCP connection to the SMTP server and then sends the mail across the connection. The SMTP server is always on listening mode. As soon as it listens for a TCP connection from any client, the SMTP process initiates a connection on that port (25). After successfully establishing the TCP connection the client process sends the mail instantly.
Internet Message Access Protocol (IMAP) is a standard protocol for accessing email on a remote server from a local client. IMAP is an application layer Internet Protocol using the underlying transport layer protocols to establish host-to-host communication services for applications.