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Unformatted text preview: hort) allows an Internet user
to move a file from one computer to another on the Internet. A file may contain
any type of digital information - text document, image, artwork, movie, sound,
software, etc. Hence, anything that can be stored on a computer can be moved
with FTP service. Moving a file from a remote computer to ones own computer is
known as downloading the file and moving a file from ones own computer to a
remote computer is known as uploading the file.
By using the FTP service, a file transfer takes place in the following manner:
1. A user executes the ftp command on his/her local computer, specifying the
address of the remote computer as a parameter.
2. An FTP process running on the user's computer (called FTP client process)
establishes a connection with an FTP process running on the remote computer
(called FTP server process).
3. The user is then prompted for login name and password to ensure that the user
is allowed to access the remote computer.
4. After successful login, the desired file(s) are downloaded or uploaded by using
get (for downloading) and put (for uploading) commands. The user can also list
directories or move between directories of the remote computer before deciding
the file(s) to be transferred. Notice from the discussion presented above that a user could transfer files to/from
a remote computer only if he/she has access rights for the remote computer. With
this restriction, it is almost impossible to provide access rights to the vast number
of the users of the Internet to a computer that contains sharable information. The
concept of anonymous FTP site is used to overcome this problem. An anonymous
FTP site is a computer that allows a user to log in with a username of anonymous
and then a password that is the user's e-mail address. The user can then download
files from the computer that have been stored on it for the purpose of sharing.
Such sites are called publicly accessible sites because they can be accessed by any
user on the Internet.
Of course, FTP service is also used for more secure file transfer operations. In
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This document was uploaded on 04/07/2014.
- Spring '14