In the formal process for finding all subnet IDs for a network and a single subnet mask, which step follows the identification of the octet in the mask with a value other than 255 or 0?
A) Identify another octet with a value other than 255 or 0.
B) Subtract that octet's value from 256 to determine the magic number.
C) Record the classful network number.
D) Find each successive subnet number.
B
Explanation: B) In identifying all subnets, the next step after finding the unique octet is to find the magic number (256 minus the octet value).
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