Discussion
What is the address range of a Class B network address in binary?
Answer: C
Correct answer: 10xxxxxx
The classes are distinguished by their leading bits: Class A begins with 0, Class B with 10, Class C with 110 and Class D with 1110. So a Class B address starts 10 in binary, which corresponds to a first octet of 128 to 191 in decimal - and reading it that way is a useful cross-check.
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