FTP Protocol Theory

Theory FTP:

Is responsible for managing remote filesystems as if they were local filesystems allows us to access 2 modes:

- Private: The customer has username and password you indicated to access it.

-Public: The client uses a generic account called anonymous access, the password is usually the address.

The hierarchy of files and subdirectories that are available to users located in a specific directory on the FTP server (FTP site). There is a secure authentication as the transfer takes place without encryption can be intercepted by malicious users

FTP Operation:

The protocol provides a double connection between client and FTP server.

1. Connection is established between client and server (port 21)

2. Username and password is requested (port 21)

3. Username and password is sent (port 21)

4. Authentication invalid (port 21)

5. Customer requests operation (port 21)

6. Server responds to command (port 20)