Objectives
§Explain how a
hierarchical network design creates a stable, reliable, scalable network
§Explain what factors
need to be considered when the Core Layer of a network is designed and
implemented
§Explain which factors
need to be considered when the Distribution Layer of a network is designed and
implemented
§Explain which factors
need to be considered when the Access Layer of a network is designed and
implemented
§Describe the benefits
and security implications of creating server farms
§Describe the considerations
of an implementation of a wireless network design
§Describe the factors
that affect the implementation of VPNs, including how remote workers can be
supported
Explain How a Hierarchical Network Design Creates a Stable,
Reliable, Scalable Network
Network requirements:
Application response time
Ease of management
Fast recovery
Fast troubleshooting
Explain How a Hierarchical Network Design Creates a Stable,
Reliable, Scalable Network
§Core Layer: connects Distribution
Layer devices
§Distribution
Layer: interconnects smaller
LANs
§Access
Layer: provides connections for hosts and end devices
Explain How a Hierarchical Network Design Creates a Stable, Reliable, Scalable
Network
Subdividing
the three-layer
model into modular areas:
1. Server farm
2. Enterprise
campus
3. Enterprise
edge
Explain How a Hierarchical Network Design Creates a Stable,
Reliable, Scalable Network
Steps
in network design projects:
Identify the network
requirements
Characterize the existing network
Design the network topology
and solutions
Explain what Factors Need to be Considered when Designing the Network Core
Layer
§Network
backbone
§Goals of the Core Layer
Provide 100% uptime
Maximize throughput
Facilitate network growth
Explain what
Factors Need to be Considered when Designing the Network Core Layer
§ Combining routing and switching in the same device
§ Redundancy and load balancing
§ High-speed and aggregate links
§
Quick
convergence
Explain what Factors Need to be Considered when
Designing the Network Core Layer
§
Full mesh topology
§
Partial
mesh topology
§ Failure prevention
§ Reducing human error
