Wrong answer or just confusion?

jscimeca715

Hello all, I'm studying Wendall Odom's book in preparation for INCD1 and have a question. He states that the total number of networks for class a is 2^7-2. Class B 2^14 and Class C 2^21. I was wondering why it wouldn't be raised to the power of 8, 16, and 24 respectively? I think I'm just having a moment where I don't understand so any help would be appreciated.

pooker

Because he is talking about the number of networks , the smallest network you can have would have one ip address, which would never work but he is just showing for example. 2^7 = 128, - 2 = 126 if you had the command no ip subnet zero entered. If your talking about total number of hosts it would be 2^8 - 2, I think its bacwards though because a class c would have 2^7 and so on

the minimum bit you could borrow would be 1 , which would make the networks look like this

192.168.2.0
192.168.2.2
192.168.2.4


he is just telling you the maximum networks supported by that class