Quiz 4 (Topic 2.3: e-mail)

IST 220 Marc Friedenberg

three major components of e-mail

User agents, mail servers, and SMTP

SMTP

Simple Mail Transfer Protocol

SMTP (Simple Mail Transfer Protocol) procedures

Handshaking, message transfer, and closure phases

difference between UDP and TCP

TCP provides reliable, connection-oriented transport with flow and congestion control. UDP offers unreliable, connectionless data transfer without these features

Command-response interaction

Communication method where one entity sends a command and the other responds with a status code and phrase.

Push protocols

(like SMTP) involves the sender initiating the transfer

Pull protocols

(like HTTP) involves the receiver requesting the data

Mail Access Protocols

Protocols used to retrieve emails from a server

Examples of Mail Access Protocols

POP3, IMAP, and HTTP

POP3

Post Office Protocol version 3

How does POP3 function?

Authorizes and downloads emails to a local device, often deleting them from the server

How does IMAP function?

Keeps all messages on the server (allows users to organize messages in folders)