Okay, I've learned how to take an IP address and mask and determine the network address. I know 2 methods: The "Magic Number" easy method from Odom's videos, and the binary AND method which I use to check my answer.
So then we move on to determining the broadcast address, as well as host range. We learned yet another "Magic Number" method: Magic Number plus relevant octet of network address, minus 1.
Example:
Mask: 255.255.224.0 IP: 128.200.100.100 Network: 128.200.96.0 (Easy: 256 - 224 = 32. 96 is the multiple of
32 without going over 100, so it's 96). Binary ANDing 224 and 100 is just as easy.
1st usable host IP: 128.200.96.1. Again, simple. Network address
+1.
Now: We're taught that to find the broadcast address, take 96, add the magic number (32) = 128, subtract 1, and we get 127.
Simple enough to memorize, but doesn't satisfy me. How do we get there the "hard" way, without using a formula?
I'm assuming there's a binary method to get from the network or IP address to the broadcast address?