Assigning Network IDs

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Assigning Network IDs

Whether you are configuring your TCP/IP LAN to connect to the public Internet, or not, you must follow specific guidelines for assigning IP addresses to networks and hosts.

Each and every physical network compliant with the TCP/IP protocol suite must have a unique network address. If the network is connected to the public Internet, the connecting network must have a network ID assigned by the InterNIC. However, all other networks may be assigned any valid network ID. Figure 3.2 provides an illustration of two intranets connected via a WAN link through the public Internet. Let’s say that the network administrator of LAN A had already configured his network using a class A network ID.

In this case, the network ID was 10.0.0.0. Meanwhile, his colleague in a separate physical location decides to use a Class B network address of 120.224.0.0 for her LAN. Fortunately for the two of them, they didn’t have to change network IDs when management decided to connect these separate LANs via the public Internet. Instead, their company was assigned a class C address of 207.21.32.0 from the InterNIC, and they were able to connect LAN A with LAN B using a WAN link provided to them by an ISP.

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