Hierarchical Network Model
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Hierarchical Network Model

Classic 3-Tier

3-Tier Model

Collapsed Core (Classic 2-Tier)

2-Tier Model

Access Layer

  • Layer 2 Switching
  • STP
  • PoE
  • Voice VLANs
  • QoS functions (tagging, trust boundary)
  • Port Security
  • VACLs
Fixed, Chassis, Stacked Switches
PCs, Access Points, Camera’s, video conference

Distribution Layer

  • Security
  • Policy
  • Routing (SVI)
  • Load balancing
  • First Hop Redundancy
  • Route Summarisation

Core Layer

  • Speed
  • Redundancy

Data Center

  • Data (Storage)
  • Apps (Servers)
Nexus, ACI

WAN Edge

Routers
MPLS, BGP

Internet

Firewalls

Network Services

  • WLC
  • ISE
  • ESA/WSA
  • CUCM

Spine-Leaf

Spine Leaf