BDC4e Chapter 16 - Chapter 16: Distributed Applications...

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Chapter 16: Distributed Applications Business Data Communications, 4e
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Business Data Communications, 4e 2 Electronic Mail Features Message Preparation Word processing Annotation Message Sending User directory Timed delivery Multiple addressing Message priority Status information Interface to other facilities Message Receiving Mailbox scanning Message selection Message notification Message reply Message rerouting
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Business Data Communications, 4e 3 Single System E-Mail Only allows users of a shared system to exchange messages Each user has unique identifier and mailbox Sending a message simply puts it into recipients’ box e.g. RITVAX, AOL
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Business Data Communications, 4e 4 Multiple Systems E-Mail Distributed system enables mail servers to connect over a network to exchange mail Functions split User agent handles preparation, submission, reading, filing, etc Transfer agent receives mail from user, determines routing, communicates with remote systems Interconnection requires standards
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Business Data Communications, 4e 5 Simple Mail Transfer Protocol (SMTP) Standard for TCP/IP mail transfer, defined in RFC 821 Concerned addressing and delivery, not content, with two exceptions Character set standardized as 7-bit ASCII Adds log information to message that indicates message path
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Business Data Communications, 4e 6 Basic E-Mail Operation User creates message with user agent program Text includes RFC 822 header and body of message List of destinations derived from header Messages are queued and sent to SMTP sender program running on a host
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BDC4e Chapter 16 - Chapter 16: Distributed Applications...

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