Adding a New Subnet to an Existing VLSM Design
The task described in this section happens frequently in real networks: choosing new subnets to add to an existing design. In real life, you can use tools that help you choose a new subnet so that you do not cause an overlap. However, for both real life and for the CCENT and CCNA exams, you need to be ready to do the mental process and math of choosing a subnet that both has the right number of host IP addresses and does not create an overlapped VLSM subnet condition. In other words, you need to pick a new subnet and not make a mistake!
For example, consider the internetwork shown earlier in Figure 20-2, with classful network 172.16.0.0. An exam question might suggest that a new subnet, with a /23 ...
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