If this is a redesign of an existing network, the current network must be analyzed and understood. As noted earlier, an existing network is likely to restrict the network design in some manner; for example, the existing cabling might not be optimal but might have to be kept for cost reasons. Analyzing the existing network is typically done during the Optimize phase of the existing network; it could also be considered as part of the Plan phase for the new network.
You should analyze the network to determine both what is good and what should be changed. For example, the network might include virtual private network (VPN) connections so that employees can access corporate files through the
Internet (VPN is discussed in Chapter 4, "Network Security Design"). If the organization is satisfied with this feature, this portion of the network might not have to be changed.
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