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Efficient Enterprise Network Architecture Design: A Comprehensive Overview

This chapter delves into the logical and physical design aspects of enterprise networks, emphasizing technologies such as Virtual LANs, ATM switches, and SONET. It explores the benefits and limitations of Virtual LANs in logical design and covers topics like transmission alternatives and frame tagging. The chapter also discusses the Physical Design of ATM LAN emulation, highlighting the pros and cons and protocols over ATM networks. Additionally, it touches upon Internet survey data, business objectives on the Internet, available services/resources, and Internet connectivity solutions. The chapter concludes with Internet/email gateways, web browser selection criteria, and an analysis of Internet/Web servers.

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Efficient Enterprise Network Architecture Design: A Comprehensive Overview

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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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