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Chapter 11: Perspectives on IPv4 Subnetting 269
The IP addresses must be assigned according to some basic rules—and for good reasons. To
make routing work efficiently, IP addressing rules group addresses into groups called sub-
nets. The rules are as follows:
■
Addresses in the same subnet are not separated by a router.
■
Addresses in different subnets are separated by at least one router.
Figure 11-3 shows the general concept, with hosts A and B in one subnet and host C in
another. In particular, note that hosts A and B are not separated from each other by any rout-
ers. However, host C, separated from A and B by at least one router, must be in a different
subnet.
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