Cisco 3 layer model

• cisco 3 layer hierarchical model

  • core
    • high-speed connection backbone
    • core switches
  • distribution
    • connects access layer to core layer
    • distribution switches
  • access
    • initial connections to end users

• 3-tier network - dedicated hardware for all 3 layers

• 2-tier network - combined hardware for distrib/core, sep for access
• 1-tier network - combined for all 3 layers