Berkeley Sockets The socket primitives for TCP.. PortProtocol Use 21 FTP File transfer 23 Telnet Remote login 25 SMTP E-mail 69 TFTP Trivial File Transfer.

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Presentation transcript:

Berkeley Sockets The socket primitives for TCP.

PortProtocol Use 21 FTP File transfer 23 Telnet Remote login 25 SMTP 69 TFTP Trivial File Transfer Protocol 79 FingerLookup info about a user 80 HTTP World Wide Web 110 POP-3 Remote access 119 NNTP USENET news Some assigned ports.

Headers (a) Four 512-byte segments sent as separate IP datagrams. (b) The 2048 bytes of data delivered to the application in a single READ CALL.

Electronic Mail Architecture and Services The User Agent Message Formats Message Transfer Final Delivery

Electronic Mail (2) Some smileys. They will not be on the final exam :-).

Architecture and Services Basic functions Composition Transfer Reporting Displaying Disposition

The User Agent Envelopes and messages. (a) Paper mail. (b) Electronic mail.

Reading An example display of the contents of a mailbox.

RFC 822 header fields related to message transport.

Electronic Mail (2) Some smileys. They will not be on the final exam :-).

MIME – Multipurpose Internet Mail Extensions Problems with international languages: Languages with accents (French, German). Languages in non-Latin alphabets (Hebrew, Russian). Languages without alphabets (Chinese, Japanese). Messages not containing text at all (audio or images).

MIME (2) RFC 822 headers added by MIME.

MIME types and subtypes (RFC 2045)

A multipart message containing enriched and audio alternatives.

Message Transfer Transferring a message from bc.com to xyz.com.

Message Transfer Transferring a message from com to

Message Transfer Transferring a message from com to

Final Delivery (a) Sending and reading mail when the receiver has a permanent Internet connection and the user agent runs on the same machine as the message transfer agent. (b) Reading when the receiver has a dial-up connection to an ISP.

POP3 Using POP3 to fetch three messages.

IMAP A comparison of POP3 and IMAP.

The World Wide Web Architectural Overview Static Web Documents Dynamic Web Documents HTTP – The HyperText Transfer Protocol Performance Ehnancements The Wireless Web

Architectural Overview (2) The parts of the Web model.

The Client Side (a) A browser plug-in. (b) A helper application.

The Server Side A multithreaded Web server with a front end and processing modules.

The Server Side (2) A server farm.

The Server Side (3) (a) Normal request-reply message sequence. (b) Sequence when TCP handoff is used.

Some common URLs.

Statelessness and Cookies Some examples of cookies.

HTML – HyperText Markup Language (a) The HTML for a sample Web page. (b) The formatted page. (b)

XML and XSL A simple Web page in XML.