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Application layer

Application layer. Accepts commands from the user Prepares messages for the network layer Data Destination. World wide web (HTTP). GET http://www.eit.ac.nz/index.html HTTP/1.1

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Application layer

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  1. Application layer • Accepts commands from the user • Prepares messages for the network layer • Data • Destination

  2. World wide web (HTTP) • GET http://www.eit.ac.nz/index.html HTTP/1.1 • Date: Mon 06 Sep 1999 09:49:00 NZSTUser-Agent: Lynx/2.0From: corrin.lakeland@eit.ac.nzReferer: http://www.yahoo.com/results.html

  3. World wide web -output • HTTP/1.1 00 OKDate: Mon 06 Sep 1999 09:52:00 NZSTServer: Apache/1.3Location: http://www.eit.ac.nz/index.htmlContent-Type: text/html • <HTML><HEAD><TITLE>…</TITLE></HEAD><BODY>…</BODY></HTML>

  4. Mail (SMTP) • Should also know about: POP, IMAP • MAIL FROM: <corrin.lakeland@xtra.co.nz>RCPT TO: <webmaster@eit.ac.nz>DATA

  5. Mail body • From: Corrin Lakeland <corrin.lakeland@xtra.co.nz>To: Herbert Halasz <webmaster@eit.ac.nz>Date: Mon 06 Sep 1999 09:49:00 NZSTSubject: Re: Installing SSL in ports other than 443X-Mailer: KmailX-Precedence: NormalPath: eit.ac.nz!telstra.co.nz!gateway…QUIT

  6. File transfer (FTP) • USER: lakeland or anonymous • PASS: secret or lakeland@cs.otago.ac.nz • DIR, PORT, … • Cannot be done over telnet

  7. Telnet • Remote commands are executed and output sent back. • Ideal for accessing crays, connecting to libraries, etc. • Non graphical (X for graphics)

  8. News (NNTP) • Netiquitte • Being replaced by mailing lists

  9. Groupware • Tools to help groups work together • Different facilities for: • Same time vs. Different time • Same place vs. Different place • Many possible facilities • Document based • Video conferencing • Group support systems

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