The 25 bit can be 0 or 1. It looks like the book chose 0. The CCNA books use
2^n - 2 for both hosts and subnets. But you also can use the
zero and one subnet so that would add 2. Then you would have 2^n for
subnets. So, 192.168.50.0 is one, and 192.168.50.128 is another subnet.
Using the first subnet: 192.168.50.0 network
192.168.50.00000001 first host
192.168.50.01111110 last host
192.168.50.11111111 broadcast
I hope this helps and also that it's right. I just got my NA recently.
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