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ORF 401 - Electronic Commerce Spring 2009 Introduction of Electronic Commerce • • • • Class List: enrolled students Background NasdaqBubble, Now Course Overview: http://orfe.princeton.edu/courses/Orf401/ Requirements – 6 programming assignments – final projects: • • • • • • enRouteCommerce* Real-time Management& Control of Mobile Assets Single Fleet Leveraging Google Maps * Android and the GPhone ; HTC Phones Augmented Reality * Beyond SETI and user certified content Wiki – Who’s involved – TA: Kevin Wan [email protected] • Feb. 2 & 4, 2009 Office Hours: Mon. 1:30-2:30 and 5-6pm 228 ORFE Week 1 ORF 401 - Electronic Commerce Spring 2009 What is eCommerce ? eBusiness? • eCommerce: use of the internet to transact business; digitally enabled transactions among organizations and individuals • eBusiness: refers primarily to the digital enabling of transactions and processes within a firm. (accounting and on-line inventory, optimal management and control of mobile assets.) Feb. 2 & 4, 2009 Week 1 ORF 401 - Electronic Commerce Spring 2009 Elements of eCommerce & eBusiness • eCommerce – – – – – Selling Buying Customer support Entertainment Navigation-based Services User generated content generation and distribution • eBusiness – Back-office support (really eBusiness) • document/funds transfer, documentation, regulatory compliance – Distribution – Design & manufacture – Optimal Management and Control of Mobile Assets Feb. 2 & 4, 2009 Week 1 ORF 401 - Electronic Commerce Spring 2009 Unique features of eCommerce Technology • • • • • • • • Ubiquity: available “everywhere” Global reach: knows no boundaries Universal standards: W3C Richness: video, audio, etc. Interactivity: user part of the loop Information density: scope, timeliness Personalization/Customization: targeted content Social Technology: Open to user content contribution Feb. 2 & 4, 2009 Week 1 ORF 401 - Electronic Commerce Spring 2009 Interesting Sites • • • • USA Today Internet 50 Map of the Market Marstoday.com JTracks 3D Feb. 2 & 4, 2009 Week 1 ORF 401 - Electronic Commerce Spring 2009 Internet Hierarchy • (Inter)Network Topology References: – Attempted visualizations: Cybergeography; (Zegura,GaTech; Alderson, CalTech) UCLA • Phone - Circuit switched – Have a continuous connection • Internet - Packet switched over a physical network • ARPANet (1969) > NSFNet (1985) > WWW (1993) • Protocols govern how applications access the network Feb. 2 & 4, 2009 Week 1 ORF 401 - Electronic Commerce Spring 2009 International Standards Organization W3C site has links to all the details and the “latest&greatest” W3C’s Mission • created a 7 layer model defining the basic functions: – OSI Reference model • Open System: different network systems supporting the functions of a related layer can exchange data • Peer-to-Peer: Data created by one layer and transmitted to another device pertains only to that layer. Intervening layers do not alter data; they simply add data in order to perform their functions on the network. Feb. 2 & 4, 2009 Week 1 ORF 401 - Electronic Commerce Spring 2009 Layer OSI Reference Model Function Info transferred TCP/IP 1. Application Data to send? Application Message ftp, http, snmp, dns 2. Presentation Data look like? Encrypted/compressed data 3. Session Who is the partner? Session manager 4. Transport Where is partner? Multiple packets TCP, UDP 5. Network Route to follow? Packets IP, ARP (Address Resolution 6. Data Link Each step in route? Frames Ethernet, ppp 7. Physical Use each step? Bits Physical wiring Protocol) Feb. 2 & 4, 2009 Week 1 ORF 401 - Electronic Commerce Spring 2009 Physical Layer (network) hierarchy Backbone high speed: ATT, MCI/WC Network Access Points (NAP) Sprint, Pac Bell, Regional networks CERFnet, Uunet, PSInet Internet Service Providers (ISP) AOL, ATT, Bell Atl. Mobile (BAM) User Organizations Tigernet User Feb. 2 & 4, 2009 Week 1 ORF 401 - Electronic Commerce Spring 2009 Network layer operations: several concepts • Dadagrams: packets move freely – vs • Virtual Circuits: force circuit-like behavior • Routing Method: Varies w/level in Hierarchy • Packet contents: Address (from, to), version, length, time-to-live, etc., data • Example: Internet Protocol (IP) Feb. 2 & 4, 2009 Week 1 ORF 401 - Electronic Commerce Spring 2009 What makes IP, IP? • Fixed length addresses 192.21.33.17 – must be unique since routing isn’t – Domain name system (DNS) coverts quad to name – standard port numbering: :80 (http) , :25 (mail) • Allows intermediate networks to fragment datagrams • It does NOT guarantee delivery • It does NOT ensure integrity of the payload • It does NOT guarantee order of receipt Feb. 2 & 4, 2009 Week 1 ORF 401 - Electronic Commerce Spring 2009 Transport Layer (host-to-host) • Issues – how & when to provide reliable comm. over unreliable channels – performance – fragmentation & re-assembly • Service Models: – connectionless >>> circuit-like – issues error detection, timing, error recovery – examples: • TCP: reliable, bi-directional, byte string (returns what was received); • UDP: uses only “check sum” to determine if it got it all. (no confirmed receipt) Feb. 2 & 4, 2009 Week 1