Protocolos do PNF e do ftp Post Office Protocol (PNF) O protocolo POP3 permite todo o programa do email em qualquer lugar no Internet de conectar a qualquer usu�rio do email para executar as fun��es usuais do email, tais como a emiss�o e a leitura, contanto que tiverem um cliente e uma senha v�lidos. POP3 � um padr�o aberto do Internet. Os comandos POP3 comuns Os comandos POP3 e as respostas comuns s�o alistados na seguinte tabela: 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) O ftp � usado para a transmiss�o dos dados no formul�rio da lima de uma aplica��o � rede. O ftp � respons�vel para quebrar dados para baixo em pacotes do IP antes que estejam emitidos, e para montar os pacotes quando chegam. Uploading e downloading da lima podem ser feitas pelo ftp f�cilmente. Sess�o do ftp Uma sess�o do ftp envolve normalmente a intera��o de cinco elementos do software que � dada na seguinte tabela. 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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