1.5 Network Protocols

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What are the differences between the three email protocols; IMAPA, POP3 and SMTP?

SMTP or Simple Mail Transfer Protocol is mostly used for sending out email from an email client to an email server. POP is used to retrieve email messages from a mail server to a mail client. The latest version, which is what's widely used, is version 3 - hence the term "POP3". IMAP, especially the current version (IMAP4), is a more sophisticated protocol. It allows users to group related messages and place them in folders, which can in turn be arranged hierarchically. It's also equipped with message flags that indicate whether a message has been read, deleted, or replied to. It even allows users to carry out searches against the server mailboxes.

How does TCP differ from UDP?

TCP provides services that ensure accurate and timely delivery between two hosts.

How does a protocol suite differ from a protocol?

A protocol is a set of standards for communication between network hosts. A protocol suite is a group of protocols intended to be used together.


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