Chapter 5: Designing a Network Topology
Topology is a map of an internetwork that indicates network segments, interconnections points
and user communities.
Map is a high level blue print of the network, analogous to an architectural drawing that
shows the location and size of rooms for a building, but not the construction material
for fabricating the rooms.
Designing a network topology first step of the logical design phase of the top-down
network design methodology.
During topology design phase you identify: networks and interconnection points, size
and scope of networks and the types of internetworking devices that will be required,
but not the actual devices.
Hierarchical network design, which is technique for designing scalable campus and WAN
network using a layered and modular model.
Hierarchical Network Design
To meet corporate and technical goals you might need to suggest a topology that
consists of many interrelated components.
Hierarchal network design model is developed in discrete layers. Each layer is focused
on a specific function. Which helps you choose the right system and features for the
Typical hierarchal topology is: Core layer, distribution and access layer.
Core layer: high end routers and switches that are optimized for availability and
Distribution layer: of routers and switches that implement policies. In small and
medium sized companies the core and distribution layers can be combined.
Access Layer: connects users via lower end user switches and wireless access points.
Why use a Hierarchical Network Design Model?
Un planned networks are called Fur Ball networks When network devices communicate with many other devices, the workload required of
the CPU on the devices can be burdensome. A disadvan