• Example of Large Enterprise Network
  • Large Enterprise Network
  • Large Enterprise Network Cont . . .
    		•

    Branch Office Network Cont




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    Branch Office Network Cont . . .

    • Global Security policy:
      • Administrated at central office.
      • Central office can also set and override local policy.
    • Remote branch proxy has no direct Internet access.
    • All clients requests are routed upstream to the proxy array at central office.

    Example of Large Enterprise Network

    • Internet
    • Proxy Server
    • Array
    • Proxy Server
    • Array
    • Router
    • Web Server
    • Department LAN
    • Web Server
    • Mail Server
    • Router
    • Web Server
    • Department LAN
    • ISP
    • Corporate
    • Network
    • Clients
    • Clients
    • Router on T1 line
    • Router
    • LAN

    Large Enterprise Network

    • Characteristic . . .
      • A central corporate office with many LAN segments and a backbone LAN.
      • Several branch offices, each with a single LAN segment
      • Use of both IP and IPX network protocols.
      • Demand-dial connectivity from the branch office to the central office.
      • An ISP & Dedicated-link connectivity from the central office to an ISP.
      • More than 2,000 clients.

    Large Enterprise Network Cont . . .

    • Proxy array is used for:
      • Distributed caching.
      • Load balancing.
      • Fault tolerance.
    • Proxy array handles all client Internet requests (locally or branch).
    • Active caching to retrieve popular URLs.

    Large Enterprise Network Cont . . .

    • Uses single array member to administration all other proxy.
    • Proxy array is used on the backbone LAN.
    • Is used at ISP to demonstrate scalability.
    • Local branch clients use Auto Dial for demand-dialing to RAS server.
    • Internet requests not serviced locally are forwarded to corporate proxy array.
    • Server administration is set and enforced at the central office.

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