As it turns out, dividing IP addresses into classes A, B and C is not flexible enough. In particular, it does not make efficient use of the available IP addresses and it does not give network administrators enough control over their internal LAN configurations.
In this diagram, the class B network 131.108 is split (probably into 256 subnets), and a router connects the 131.108.2 subnet to the 131.108.3 subnet.
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