I am reading a book called Interconnecting Cisco Network Devices, part 2 ICND2. In the book, it gives an example which I'm having a hard time grasping the concept. I've attached the example from the book. Could someone help me?
I am new to all of this and still learning about subnet mask. Thanks for your quick response. After reviewing your response, the only question I have is why or how did you know to use the mask 255.255.240.0 with 172.30.16.0 -> 172.30.31.0?
