By John Swartz, Todd Lammle
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The Ring Network Model T he ring topology builds upon the star topology with a few significant modifications. This design is typically used when a small company expands nationally and two sites are located close together. 2. com 14 Chapter 1 Introduction to Network Design As you can see, the ring design eliminates one of the main negative aspects of the star topology. In the ring model, a single circuit failure will not disconnect any location from the enterprise network. However, the ring topology fails to address these other considerations: Low scalability No single point of failure Higher cost Complex setup and configuration Difficulty incorporating new locations Consider the last bullet item in the list and how the network designer would add a fifth location to the diagram.
Designers should refrain from adding features just because they are available and focus on simplicity of design. Troubleshooting capabilities can be enhanced by placing monitoring tools in the network. Protocol analyzers and remote monitoring (RMON) probes should be available for rapid dispatch if permanent installations are not an option at critical points in the network, including the core and distribution layers. This chapter will later define the core and distribution layers, in addition to the hierarchical model.
Building in expandability and upgradability will affect the lifespan of a network installed today. Designers should always consider how they might expand their designs to accommodate additional users or services before committing to a strategy. Considerations of Network Design T he network design considerations addressed in this section are the solutions to the network design issues addressed earlier. For example, the first network design consideration below addresses excessive broadcasts. The designer will need to understand the concept of broadcasts in the network, how they are impacting the existing network, how they may increase in the future, and how broadcasts may be dealt with in the lifespan of the network.