For data to be sent to its destination directly, the underlying physical structure, or wiring, should support the logical structure, or the Layer 3 addressing. It also seems reasonable that this structure should reflect the organizational data flow. It would make sense for servers to be accessible to departments that share information and for the physical wiring and logical addressing to support this sharing of resources. Therefore, the servers may be physically adjacent and on the same IP subnet. The reason that both the physical and the logical structure of the network should support the organizational data flow is that, without this structure, application data can wander throughout your network inefficiently, clogging up available bandwidth.
This chapter reviews some of the fundamental concepts of IP addressing. After mastering its subtleties, you will then be able to consider the network management power that results from careful design of the IP addressing scheme.
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