The Application Layer DNS – The Domain Name System The DNS Name Space Resource Records Name Servers

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Presentation transcript:

The Application Layer

DNS – The Domain Name System The DNS Name Space Resource Records Name Servers

The DNS Name Space A portion of the Internet domain name space.

Resource Records The principal DNS resource records types.

Resource Records (2) A portion of a possible DNS database for cs.vu.nl.

Name Servers Part of the DNS name space showing the division into zones.

Name Servers (2) How a resolver looks up a remote name in eight steps.

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.

Message Formats – RFC 822 RFC 822 header fields related to message transport.

Message Formats – RFC 822 (2) Some fields used in the RFC 822 message header.

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 (3) The MIME types and subtypes defined in RFC

MIME (4) A multipart message containing enriched and audio alternatives.

Message Transfer Transferring a message from 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 (a) A Web page (b) The page reached by clicking on Department of Animal Psychology.

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.

URLs – Uniform Resource Locaters 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)

HTML (2) A selection of common HTML tags. some can have additional parameters.

Forms (a) An HTML table. (b) A possible rendition of this table.

Forms (2) (a) The HTML for an order form. (b) The formatted page. (b)

Forms (3) A possible response from the browser to the server with information filled in by the user.

XML and XSL A simple Web page in XML.

XML and XSL (2) A style sheet in XSL.

Dynamic Web Documents Steps in processing the information from an HTML form.

Dynamic Web Documents (2) A sample HTML page with embedded PHP.

Dynamic Web Documents (3) (a) A Web page containing a form. (b) A PHP script for handling the output of the form. (c) Output from the PHP script when the inputs are "Barbara" and 24 respectively.

Client-Side Dynamic Web Page Generation Use of JavaScript for processing a form.