The Problem: Wasting IP Host Addresses
As an example of the possibility of excessive IP address waste,
examine Figure 10-8, which uses three
Class B networks.
The design in Figure
10-8 requires three networksin this case, three different Class B networks.
Each Class B network has 2162 host addresses (65,534) in itfar more
than you will ever need for each LAN. Only a few IP addresses have been used so
farone for each computer, plus one each for the router interfaces. (Remember:
Each network interface has an IP address. So, in network 150.2.0.0, two
addresses are used by the two computers, another is used by R1's right-side
Ethernet interface, and a fourth is used by R2's left-side Ethernet
interface.)
IP routing processes still work well, based on the fact that
all hosts in the same network are in the same place. For instance, all hosts
with addresses that start with 150.1 need to be on the Ethernet on the left side
of Figure 10-8. However, more than 65,000
IP addresses exist for each of the three networks that are sitting around,
unused.
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