Binary Practice Problems
Figures 16-4 and 16-5 demonstrate a process to find the subnet ID using binary math. The following process summarizes those steps in written form for easier reference and practice:
Step 1. Convert the mask to prefix format to find the length of the prefix (/P) and the length of the host part (32 – P).
Step 2. Convert the IP address to its 32-bit binary equivalent.
Step 3. Copy the prefix bits of the IP address.
Step 4. Write down 0s for the host bits.
Step 5. Convert the resulting 32-bit number, 8 bits at a time, back to decimal.
The process to find the subnet broadcast address is exactly the same, except in Step 4, you ...
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