comuter networks

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Recommended: The internet service provider (isp)

3. THE DIFFERENTS VARIOUS APPLICATIONS OF COMPUTER NETWORK 3.1. ELECTRONIC MAIL (EMAIL) Electronic mail, e-mail or email, email, is a service for the transmission of messages sent electronically via a computer network (mainly Internet) in the electronic mailbox of a recipient chosen by the issuer. 1. How Email Works The working of the electronic mail is based on the use of an electronic mailbox. When sending an email, the message is routed from server to server to the recipient's email server. More accurately, the message is sent to the server of transport (named for Mail Transport Agent MTA) responsible e-mail, until the recipient MTA. On the internet, MTAs communicate between them through the SMTP Protocol and are logically called SMTP (sometimes outgoing mail server) servers. The recipient MTA server then delivers the mail to the server for incoming e-mail (named MDA for Mail Delivery Agent), which then stores the mail until the user Vienna raise it. There are three primary protocols to get mail on an MDA:  The Exchange by the POP3 Protocol The standard describing the protocol POP3 Post Office Protocol (Post Office Protocol) version 3] is contained in the RFC1939. It is the Protocol for the repatriation of the oldest mail; it was thought to be used offline. It means that the client should connect, query mail server and repatriate its messages, and then disconnect. Then, at regular intervals, the client queries the server on the presence of mail to rise.  The Exchange by the IMAP Protocol During an Exchange with the Internet Message Access Protocol (IMAP) Protocol, the list of messages is also sent to the mail program, but the main difference lies in the level of the repatriation of the messages. Indeed, messages are han... ... middle of paper ... ... your website, and provide email addresses. A provider of access to the Internet (ISP), is an organization (usually a business) offering a connection to the Internet computer network. The term in French designating an ISP is Internet Service Provider (ISP).  SSL/TLS: Function: secure exchanges on internet (mail is included). Transport Layer Security (TLS), formerly known as Secure Sockets Layer (SSL) is a protocol for security of exchanges on the Internet.  PORT: Function: determined which program communication is intended. Many programs can be executed simultaneously on Internet. Each of these programs works with a Protocol (HTML, IMAP, FTP, etc.), however the computer must be able to distinguish the different data sources.  NDR: Function: alert email rejection. The essential characteristic of all these software is able to access the e-mails of a user box.

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