Post Office Protocol (POP)

A method of accessing electronic mail or bulletin board messages that are kept on a (possibly shared) mail server. IMAP permits a “client” email program to access remote message stores as if they were local. For example, email stored on an IMAP server can be manipulated from a desktop computer at home, a workstation at the office, and a notebook computer while traveling, without the need to transfer messages of files back and forth between these computers. IMAP can be regarded as the nextgeneration POP. A protocol used to transfer email messages from an email server to an email client.
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A workstation in a network that is set up to use the resources of a server. Individual or process acting on behalf of an individual who makes requests of a guard or dedicated server. The client’s requests to the guard or dedicated server can involve data transfer to, from, or through the guard or dedicated server.
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The Internet email protocol. The primary protocol used to move email messages from clients to servers and from server to server.
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Using the client/server model and the World Wide Web’s HyperText Transfer Protocol (HTTP), Web Server is a software program that serves Web page files to users.
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An attack in which a malicious user records the traffic between a client and server. The packets sent from the client to the server are then played back or retransmitted to the server with slight variations of the time stamp and source IP address (in other words, spoofing). In some cases, this allows the malicious user to restart an old communication link with a server. Also referred to as a playback attack.
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