Protocoles de BRUIT et de ftp

Le protocole POP3 permet � n'importe quel programme d'email n'importe o� sur l'Internet de se relier � n'importe quel serveur d'email pour ex�cuter les fonctions habituelles d'email, telles que l'envoi et la lecture, tant que elles ont un compte et un mot de passe valides.

POP3 est une norme ouverte d'Internet.

Les commandes POP3 communes

Les commandes POP3 et les r�ponses communes sont �num�r�es dans la table suivante :

Command	Responses
getwelcome ()	Gets the greeting from the server.
user (username)	Login with a username. If valid username, server will respond with request for password.
pass_ (password)	Send password. If valid, server response will be two numbers, message count and mailbox size.
stat ()	Get the mailbox status. Response is two numbers, message count and mailbox size.
list ([message])	Get list of messages. An option "message" gets information on a specific message.
retr (message)	Get message number "message".
dele (message)	Delete message number "message".
rset ()	Remove all deleted message markings.
noop ()	No operation. Do nothing. Really. Needed in unusual programming situations.
quit ()	Quit. Commits all changes, unlocks the mailbox, and ends the server connection.
top (message, lines)	Gets just the first "lines" number of lines of message number "message". Useful on low bandwidth lines to get just the first part of long messages.
uidl ([message])	Gets a unique id list -- a message digest including unique ids. The option gets the unique id for the specific message "message".

Ftp (File Transfer Protocol)

Le ftp est employ� pour la transmission des donn�es sous forme de dossier d'une application au r�seau.

Le ftp est responsable de casser des donn�es vers le bas en paquets d'IP avant qu'elles soient envoy�es, et d'assembler les paquets quand ils arrivent.

T�l�charger et t�l�charger du dossier peuvent �tre faits par le ftp facilement.

Session de ftp

Une session de ftp implique normalement l'interaction de cinq �l�ments de logiciel qui est donn�e dans la table suivante.

User Interface	This provides a user interface and drives the client protocol interpreter.
Client PI	This is the client protocol interpreter. It issues commands to the remote server protocol interpreter and it also drives the client data transfer process.
Server PI	This is the server protocol interpreter which responds to commands issued by the client protocol interpreter and drives the server data transfer process.
Client DTP	This is the client data transfer process responsible for communicating with the server data transfer process and the local file system.
Server DTP	This is the server data transfer process responsible for communicating with the client data transfer process and the remote file system.

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