By Todd Lammle
Cisco platforms dominates the Internetworking scene first and foremost of the twenty first century. this article is a advisor to the Cisco Internetwork layout examination - the ultimate step to achieving the Cisco qualified layout specialist certification (CCDP). incorporated is a CD which incorporates a checking out engine.
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Com The Three-Tier (Hierarchical) Network Model 21 It is very important that designers understand the significance of the model’s three tiers. 1. 8 provides a logical view of the three-tier hierarchy. 8 Logical view of the hierarchical model Core Layer Distribution Layer Access Layer The Core Layer In generic terms, a core refers to the center of an object. In network design, this concept is expanded to mean the center of the network. Typically focused on the WAN implementation, the network core layer is responsible for the rapid transfer of data and the interconnection of various distribution and access layers.
Without the core, all other areas would be isolated. Convergence and load balancing should also be incorporated into the core design. Note that servers, workstations, and other devices are typically not placed in the core. 9 illustrates the use of the core to interconnect three sites in the enterprise. This core is composed of a WAN medium—possibly Frame Relay, ATM, or point-to-point links. com 28 Implement Features at the Appropriate Layer A What Problem? com 29 Future Needs? Network Lifespan?