Distribution/Regional Network Design
The role of the regional network is to route intra- and inter-regional traffic. The regional network generally is comprised of a DC as the hub and a number of access POPs as the spokes. Usually, two redundant routers in each regional network will connect to the backbone.
DCs may also provide services such as Web-caching, DNS, network management, and e-mail hosting. In some cases, the latter functionality may be extended into major POPs.
Placement of DCs is generally an economical choice based on the geographical proximity to a number of access sites. However, this does not mean that an access POP cannot be a mini-distribution center or transit for another access POP, but this is the exception rather than ...
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