2. WHAT IS THE INTERNET? IT IS NOT OWNED BY ANYONE IT IS NOT HOMOGENEOUS NO CENTRALIZED MANAGEMENT OVERSIGHT ORGANIZATIONS

3. WHAT IS THE INTERNET?  PROVIDES COMMUNICATIONS SERVICES E-MAIL FILE TRANSFER ONLINE CHAT AUDIO & VIDEO WORLD WIDE WEB  INTERLINKED WEB PAGES  SEARCH  INSTANT MESSAGING  E-SHOPPING

4. WHAT IS THE INTERNET? IT IS:  COMPLEX  WORLDWIDE  PUBLICLY ACCESSIBLE  PACKET SWITCHING XMISSION TECHNOLOGY  HAS INTERCONNECTED NETWORKS DOMESTIC ACADEMIC BUSINESS GOVERNMENT COMMERCIAL

5. INTERNET HISTORY 1957SPUTNIK 1958DOD-ARPA, ADVANCED RESEARCH PROJECT AGENCY FORMED 19651 st EMAIL, TIMESHARE TO MAINFRAME COMPUTER OCT. 1968ARPANet WORKING GROUP MET AT SRI NOV. 1969ARPANET UCLA-SRI COMPUTER LINK ESTABLISHED DEC. 1969UCLA-SRI-UCSB-UofUTAH LINK-UP 19711 ST NETWORK E-MAIL TRANSMITTED BETWEEN COMPUTERS 1973FTP PROTOCOL INTRODUCED/IMPLEMENTED BY ARPANet 1973ROBT. KAHN & VINTON CERF BEGAN WORK ON TCP/IP 19751 ST COMMUNICATION TEST USING TCP/IP 1975ARPA TURNED ARPANet OVER TO DCA 1978PACKET SWITCHED NETWORKS EXPANDED TO EUROPE

6. INTERNET HISTORY – CONTD. 1979CompuServ OFFERS E-MAIL SERVICE 1981NETWORKS EXPANDED TO CANADA, HONG KONG, & AUSTRALIA 1982TCP/IP ADOPTED FOR ALL MILITARY COMPUTER NETWORKS 1983- TCP/IP REPLACES PRIOR PROTOCOL USED BY ARPANet - MILITARY PORTION OF ARPANet SPUN OFF TO MILNET - DOMAIN NAME SYSTEM INVENTED 1986NATIONAL SCIENCE FND NETWORK(NSFNetwork) ON LINE REPLACING ARPANet 1988- NSFNet PRINCIPAL INTERNET BACKBONE WORLDWIDE - NSFNet CREATED 5 SUPER CONDUCTOR CENTERS - NSFNet WAS THE PRINCIPAL INTERNET BACKBONE 1991TIM BERNERS-LEE RELEASES WORLD-WIDE WEB (WWW) 1993MOSAIC (PRECURSOR TO NETSCAPE) MADE AVAILABLE TO PUBLIC 1994NSFNet TRAFFIC PASSES 10 TRILLION BYTES/MONTH 1995NSFNet DECOMMISSIONED; INTERNET TURNED OVER TO ISPs & TRANSMISSION CARRIERS

9. PROTOCOLS RULES OR CONVENTIONS TCP (TRANSMISSION CONTROL PROTOCOL) – CONTROLS PACKAGING OF DATA INTO PACKETS AT SOURCE AND RECOMBINES DATA AT DESTINATION IP (INTERNET PROTOCOAL) – CONTROLS THE ROUTING OF DATA OVER THE INTERNET UDP (USER DATAGRAM PROTOCOL) – ALSO CONTROLS PACKAGING OF DATA INTO PACKETS SIMILAR TO, BUT NOT AS RELIABLY TRANSMITTED, AS TCP. USED FOR STREAMING AUDIO/VIDEO

10. TCP/IP STACK LAYER

11. INTERNET DOMAIN NAME DOMAIN NAME racorinda@pacbell.net http://www.yahoo.com http://finance.yahoo.com.us/marketupdates/overview.html  1 st LABEL TO LEFT OF “/” IS THE TOP DOMAIN, GEOGRAPHICALLY us=U.S., ca=Canada, fr=France, de=Germany, ru=Russia, es=Spain, jp=Japan  2 nd LABEL TO LEFT IS THE TOP DOMAIN, GENERIC.biz,.com,.edu,.info,.net,.org,.info,.mil,.arpa,.museum  3 rd LABEL TO LEFT IS SECOND LEVEL DOMAIN  REMAINING LABELS TO LEFT ARE SUB-DOMAINS UNDER CONTROL OF THE SECOND LEVEL DOMAIN

12. INTERNET DOMAIN NAME IP ADDRESS

14. DOMAIN NAME REQUEST IP Request: finance.yahoo.com/ NAME SERVER FOR LOCAL ISP IP Request: yahoo.com Address For: yahoo.com IP Request: Finance Address For: Finance Communications Established ROOT SERVER NAME SERVER FOR yahoo.com 1 2 2 3 7 4 5 6 http://finance.yahoo.com/marketupdates/ overview.html FINANCE SERVER AT YAHOO.COM

15. YAHOO.COM GATEWAY SERVER YAHOO.COM NAME SERVER FINANCE.YAHOO.COM SERVER FIREWALL BRIDGE/ SERVER

16. E-MAIL CLIENT WEB BROWSER DATA HEADER <1500 BYTES IP VERSION HEADER LENGTH PACKET PRIORITY, QUALITY OF SERVICE PACKET LENGTH, BYTES TAG TO HELP RECONSTRUCT PACKET TAGS TO PERMIT FRAGMENTATION/MORE TO FOLLOW? FRAGMENT ORDER TAG TIME TO LIVE BEFORE PACKET TO BE DISCARDED TRANSPORTATION PROTOCOL (E.G., TCP, UDP) HEADER CHECKSUM SENDER IP ADDRESS DESTINATION ADDRESS OPTIONAL TAGS DATA PACKET

17. PORTS – VIRTUAL ENTRANCEWAY BETWEEN YOUR COMPUTER & THE INTERNET TOTAL AVAILABLE PORTS = 65,535

18. PORT NO.DESCRIPTION 20/TCPFTP—data 21/TCPFTP—control (command) 23/TCP,UDPTelnet protocol—unencrypted text communications 25/TCP,UDPSimple Mail Transfer Protocol (SMTP)—used for e-mail routing between mail servers 53/TCP,UDPDomain Name System (DNS) 70/TCPGopher protocol 80/TCPHypertext Transfer Protocol (HTTP) 109/TCPPost Office Protocol 2 (POP2) 110/TCPPost Office Protocol 3 (POP3) 115/TCPSimple File Transfer Protocol (SFTP) 220/TCP,UDPIMAP, Interactive Mail Access Protocol, version 3 465/TCPSMTP over SSL 513/TCPLogin 531/TCP,UDPAOL Instant Messenger, IRC 532/TCPnetnews OUTGOING E-MAIL: SMTP Port 115POP3 Port 110 SMTP W/SSL Port 465POP 3 W/SSL Port 995 IF YOU USE A NON-STANDARD PORT YOU MUST SPECIFY THE PORT NUMBER BEING USED IN THE URL; E.G., http://www.parishilton.com:81/

19. E-MAIL METHOD OF WRITING, SENDING, RECEIVING AND SAVING MESSAGES USING AN ELECTRONIC COMMUNICATION SYSTEM COMMON PROTOCOLS - POP (POST OFFICE PROTOCOL): DELETES MSGS ON SERVER WHEN D/L - IMAP (INTERNET MESSAGE ACCESS PROTOCOL): LEAVES MSGS ON SERVER - WEBMAIL (HTTP PROTOCOL): ACCESS MAIL SERVER WITH BROWSER - SMTP (SIMPLE MAIL TRANSFER PROTOCOL): STANDARD FOR OUTGOING MAIL - PROPRIETARY PROTOCOLS: FOR INTRANET SYSTEMS, LIKE AOL/COMPANIES - HTML (HYPERTEXT MARKUP LANGUAGE): MESSAGE BODY - MIME (MULTIPURPOSE INTERNET MAIL EXTENSIONS): PERMITS TEXT OTHER THAN ASCII, TEXT & NON-TEXT ATTACHMENTS, AND MULTIPLE PART MSGS.

20. Attach: HEADER BODY CLIENT PORT SMTP: 115/465 HTTP: 80 AOL: 531 PORT POP3: 110/995 IMAP4:220/993 EMAIL TRANSMISSION DIAGRAM smtp.att.yahoo.com

21. WORLD WIDE WEB (www) or “The Web” SIR TIMOTHY BERNERS-LEE CREATED WEB TECHNOLOGY MARC ANDREESSEN CREATED THE FIRST BROWSER