Network Model Crib Notes

These are my ‘crib notes’ that I’ve made to serve as a last minute refresher. Please forgive the grammer / spelling as I did not develop these notes with publishing in mind

Network Modelling

*** Theory ***

  • Three Layer Model (3 Layers)
    • Core – Low latency, fast switching, Advanced QoS, Redundancy, Root Bridges
    • Distribution – Handle routing, High Speed ports,
    • Access – VLAN, Basic QoS, Traffic Filtering, Redundant uplinks, future growth, high port density
  • Cisco Enterprise Architecture (6 Modules)
    • Campus – Core layer of campus network.
    • Edge – Internet connectivity, DMZ, VPNs
    • WAN – PPP, Frame, DSL, MPLS
    • Branch – Remote Office
    • Teleworker – SOHO / Mobile Users
    • Data Centre – DR
  • Intelligent Information Network (Vision)
    • SONA – Single Vendor and Virtualisation
      • Application Layer – How end users interact
      • Interactive Service Layer – Virtualisation
      • Network Infrastructure layer

    *** Other ***

    • Reconinsense Attack –Uses packet sniffers etc . Combat with switched infrastructure.
    • DoS Attacks – Can use IP spoofing and DoS attacks
    • Virus – requires human assistance to spread
    • Worm – Saved in memory, spreads automatically
    • ip inspect – is IOS firewall (formly CBAC). Inside interface inspects inbound and outside interface inspects outbound


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