Remote Logging, Electronic Mail, and File Transfer - BZU PAGES: Find Presentations, Reports, Student's Assignments and Daily Discussion; Bahauddin Zakariya University Multan

**bonfire** · #1 18-03-2011, 06:39 PM

Remote Logging, Electronic Mail, and File Transfer

* The protocol that supports email on the Internet is called Simple Mail Transfer Protocol (SMTP).
* The UA prepares the message, creates the envelope, and puts the message in the envelope.
* The email address consists of two parts: a local address (user mailbox) and a domain name. The form is localname@domainname.
* The MTA transfers the email across the Internet.
* SMTP uses commands and responses to transfer messages between an MTA client and an MTA server.
* The steps in transferring a mail message are connection establishment, message transfer, and connection termination.
* Multipurpose Internet Mail Extension (MIME) is an extension of SMTP that allows the transfer of multimedia and other non-ASCII messages.
* Post Office Protocol, version 3 (POP3) and Internet Mail Access Protocol, version 4 (IMAP4) are protocols used by a mail server in conjunction with SMTP to receive and hold email for hosts.
* File transfer protocol (FTP) is a TCP/IP client-server application for copying files from one host to another.
* FTP requires two connections for data transfer: a control connection and a data connection.
* FTP employs ASCII for communication between dissimilar systems.
* Prior to the actual transfer of files, the file type, data structure, and transmission mode are defined by the client through the control connection.
* Responses are sent from the server to the client during connection establishment.
* There are three types of file transfer:
a. A file is copied from the server to the client.
b. A file is copied from the client to the server.
c. A list of directories or file names is sent from the server to the client.
* Most operating systems provide a user-friendly interface between FTP and the user.
* Anonymous FTP provides a method ofr the general public to access files on remote sites.