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Chapter 11 Enterprise Networks & Internet

Chapter 11 Enterprise Networks & Internet. Enterprise Network Architecture Internet Enterprise Network & Internet. Enterprise Network Architecture. Overview Logical Design Physical Design. Overview. Virtual corporation Virtual private network or enterprise network Virtual LAN

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Chapter 11 Enterprise Networks & Internet

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  1. Chapter 11Enterprise Networks & Internet • Enterprise Network Architecture • Internet • Enterprise Network & Internet

  2. Enterprise Network Architecture • Overview • Logical Design • Physical Design

  3. Overview • Virtual corporation • Virtual private network or enterprise network • Virtual LAN • Technology • LAN switches • ATM switches • Backbone routers • SONET

  4. Overview • Application • Collaborative computing application software • Intelligent gent-based software • Data: distributed database

  5. Virtual LANs Logical Design • Use LAN switch with software • Types • Layer 2 virtual LAN (switch) • Layer 3 virtual LANs (routing switches) • Pro • Lower cost of constantly changing and moving workstations • Limitations • Broadcasting and multicasting to its members • Hard to manage (switching) • No filtering for security • No standard and interoperability

  6. Virtual LANs Logical Design • Transmission alternatives • Signaling message (broadcasting address) • Frame tagging (address tag) • Time division multiplexing (bandwidth) • IEEE 802.10:encryption, authentication, segmentation, reassembly • Bandwidth Hierarchy • Distributed backbones: bridge • Collapsed backbones: router with numerous internetworking modules and enormous bandwidth capacity

  7. Physical Design: ATM LAN emulation • ATM address resolution • LAN emulation client (LEC) software • ATM-to-LAN conversion devices • convert Ethernet, token ring or FDDI into fixed length ATM cells • Unicast (point-to-point) transmission • LAN emulation server (LES) software • LES configuration services • LES broadcast and unknown services (BUS) • LES emulation services (address resolution protocol)

  8. Physical Design: ATM LAN emulation • Pros • support multiple network layer protocols between virtual LANs • Cons • Flat network topoloty • Broadcast storms • No filtering for security

  9. Protocols over ATM Network • Classical IP over ATM • Logical IP subnet or LIS: within subnet • Needs ATM address resolution protocol (ATMARP) • Multiprotocol over ATM (MPOA) • Edge devices • Route server • IP switching • Long file use layer 2 • Short message uses layer 3

  10. Internet Survey • 72% enhance company image • 22% financially rewarding • 40% financial rewards after 12-24 months • Less 6% using credit card transaction • 11 million Internet users • 200 million television viewers

  11. Business Objectives: Internet • Customer service • Marketing opportunity • Competitive pressure • Financially profitable

  12. Internet Services/Resources • World Wide Web • Information servers • FTP servers • Gopher servers • WAIS servers • USENET servers • Global e-mail

  13. World Wide Web • Web browsers • Web site • Graphical or multimedia

  14. Information Servers • Telnet: TCP/IP • FTP servers: file transfer protocol • Gopher • Search engines • Text • WAIS (wide aarea information services) • USENET servers: Network new transport protocol (NNTP)

  15. Global E-Mail • List server • Electronic magazines (E-zines

  16. Internet Pro & Con • Pro • Access • Bandwidth • Front-end tools • Server tools • Information • Con • Security • Bandwidth • search • Ownership • Regulation

  17. Internet Connectivity • Internet access providers (IAP) or Internet connectivity providers (ICP) • Internet presence provider (IPP) • Network access device • Modem • CSU/DSU • Router

  18. WWW Connectivity Alternatives • Web browser • Mosaic • Internet Explorer • Netscape • Web terminology • Hypertext transport protocol (HTTP) • Hypertext markup language (HTML) • Uniform resource locator (URL)

  19. Web Browser Selection Criteria • Vertical integration: e-mail • Ease of setup and use • Performance • Horizontal integration: network attached resources

  20. Internet E-Mail Gateways • Translator • Simple mail transport protocol (SMTP) • No foreign character • Limited file size • No executable file • Multiple Internet mail extension (MIME)

  21. Internet Gateway vs. Internet-Enable Clients • Internet gateway • Pros: single location, easy management • Cons: bottleneck • Internet-enabled clients • Pro: not bottleneck • Cons: configuration, software, LAN protocol

  22. Internet/Web Server Analysis • Link to Internet • IP address (IAP or InterNIC) • Server hardware • CPU: 120MHz Pentium • Storage: RAID • Bus: PCI • Memory: 128 MB • Network interface card: 100-Mbps Ethernet • High-end UNIX workstation

  23. Internet/Web Server Analysis • Server software • Web page & input form (common gateway interface CGI) • Gateway: file transfer • Security • Management: monitoring & reporting

  24. Assignment • Review chapters 9-11 • Read chapter 12

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