Saturday, 2 June 2012

Telnet and FTP

TCP/IP Applications
• World Wide Web's Hypertext Transfer Protocol (HTTP)
• Simple Mail Transfer Protocol (SMTP)
• File Transfer Protocol (FTP)
• Telnet (Telnet) which lets you logon to remote computers
• Simple Network Management Protocol (SNMP)

Defintion: Telnet is a telecommunications software utility which allows you to become a user on a remote computer. Once you access the remote terminal, you can use it for its intended purposes.
  • Telnet utility does not allow you to transfer and save files to your own computer.
  • Telnet usually works between different operating systems
  • The term "TELNET" also refers to the remote login that's possible on the Internet because of the TELNET Protocol.
  • Telnet allows you to remotely access a computer over the Internet.
    - allows you to create, edit, execute and delete files just as if you were sitting at that computer
  • "Telnet to a host" means to establish a connection across the Internet from one host to another.
  •  Usually, you must have an account on the remote host to be able to login
uses of telnet:

• Connecting to a system to use specific programs such as e-mail and ststistics applications
• Connecting to a networking device for information or configuration purposes – e.g for trouble shooting
• Connecting to an online database of information e.g library catalogue
• Connecting to an online forum to interact and communicate..accessing library’s OPAC the most
popular application during the era of text based internet...

Flies Transfer Protocol : FTP
  •  FTP is a protocol that allow computers to communicate with each other across the Internet to arrange for the transfer of files from one computer to another 
  •  FTP ('File Transfer Protocol') is a way to quickly upload and download files on the Internet
  • Not all computers provide FTP service. Host (server) computers must run FTP server software to manage connections from client machines requiring FTP access to the server¡¦s files
  • FTP provides clients with a window into the server that displays the files that can be copied to the client machine¡¦s storage media.
  • Typically a site on the Internet stores a number of files (they could be application executables, graphics, or audio clips, for example), and runs an FTP server application that waits for transfer requests 
  • Some FTP servers are set up for private use, and access is controlled by a user name and password method.
  • To download a file to your own system, you run an FTP client application (example : WS FTP) that connects to the FTP server, and request a file from a particular directory or folder.
  •  Files can be uploaded to the FTP server, if appropriate access is granted. Many Internet Service Providers limit the size of email attachments (around 5MB). Using FTP, you are only limited by the amount of space you are allocated on the server.
uses of FTP
- Uploading files from PC to Server
- Tranfering files from PC to PC
- Downloading software from server to PC


  •  Quickly transfer large amounts of data between your  clients, vendors, and anyone else who has an Internet connection and FTP client software. 
  • Reduce or eliminate the need to copy data on disks for overnight delivery, saving time and money.
  •  No need for expensive server software and static IP address to host your own site.
  • Share your files with others securely. A user ID and password is needed to access your site.
  • There are two types of FTP:
 "non-anonymous."
  • The most widely used type is anonymous FTP.
  • If a file is stored in an anonymous FTP directory virtually anyone with Internet access and an FTP program of some sort, even a web browser, can download the file.
  • Uploading, on the other hand, is not usually possible with anonymous FTP.
  • Anonymous FTP is used primarily to give the Internet public download access to a particular directory of files. Anyone can download files from the directory, but only the "owner" of directory can upload to the directory.
  •  E.g downloading mp3 player from the host

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