I'm pretty new to all this stuff. Just learning about NAT in my class now. I have a decent understanding of subnetting up to this point but am always confused when we start subnetting in the 3rd octet.
I am following a youtube video to help me get through a particular packet tracer problem and have a question about breaking a /19 address into 2 equal subnets.
https://www.youtube.com/watch?v=VGx23Wn4_m4
As you can see in the video he makes it a /20 and breaks it into 172.16.128.0 and 172.16.144.0....
Why can we not break it into 2 equal subnets but keep the /19? So it would be 172.16.128.0 and 172.16.160.0. I'm sure there is a reason why it needs to be made /20 but I just don't see why it would be necessary?!
If someone can shed some light on this for me it would be majorly appreciated!
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