Summary Theory H1 to H6

Enterprise Networks
Chapter 1: Hierarchical Network Design

1.1 Overview
Small network: 1 to 200 devices

Medium: 200 to 1000 devices

Large network: 1000+ devices

Structured Engineer Principles


- Hierarchy
- Modularity
- Resiliency
- Flexibility



- Hierarcy
o Access layer: user access to the network
o Distribution layer: policy-based connectivity
o Core layer: Fast transport between distribution switches
Access layer:
 Layer 2 switching
 Availability
 Port security
 QoS
 ARP inspection
 VACLs
 Spanning tree
 PoE

Distribution layer:

 Aggregation LAN/WAN links
 ACLs (policy based security)
 Redundancy/load balancing

Core:

 High-speed switching
 Reliability/fault tolerance
 Faster equipment
 Avoid CPU-intensive tasks (security, inspection,QoS)