File Transfer And Remote File Access

File Transfer Protocol (FTP)
• standard mechanism provided by TCP/IP for copying file from one host to another.
• FTP Site is a computer running an FTP server Application
• On FTP Server, a program called daemon allows to download and upload files
• FTP can transfer binary files over internet without encoding and decoding overhead
• FTP can upload files from your computer to another computer
• Large organization use mirror site; contain same set of files
• Mirror site serve as a backup for the main server if main server fails


How FTP Works
• FTP server identifies user based on user IDs
• FTP client / server create a session after you are logged on
• FTP client has access to the file system on the server
• FTP cliend / server software can access their individual file system in either direction

• FTP uses two well known port:

• Port 20 for data connection
• Port 21 for control connection

BASIC MODEL OF FTP

Requirement For Using FTP

• An FTP client installed on the computer.
• Login details of the FTP server to which you want to connect: 
• The FTP server address. This looks a lot like the address you type in Internet Explorer to browse websites. One such example is “ftp://ftmk.utem.edu.my”. 
• The user name and password required for the FTP connection. Some FTP servers let you connect to them anonymously. For anonymous connections, you do not need a user name and password.

FTP From A Command Prompt

•  Another similar FTP is TFTP (Trivial FTP)

•  TFTP has fewer command than FTP

•  TFTP used only to send and receive files.

•  It can be used for multicasting which a file is sent to more than one client at the same time using UDP

TFTP Usage And Design•  Transfer files between process.
•  Minimal overhead(no security)
•  Easy to implement
•  Small-possible to include firmware
•  Used to bootstrap workstations and network devices.

TFTP Protocol

• •  Read request
• •  Write request
• •  Data
• •  ACK(acknowledgement)
• •  Error