An ISP has the CIDR block 245.248.128.0/20. It wants to give half of it to organization A and a quarter to organization B, keeping the rest. Which is a valid allocation to A and B?
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Correct answer: A. 245.248.136.0/21 and 245.248.128.0/22
Explanation
The /20 spans 245.248.128.0–143.255. Half is a /21 and a quarter a /22. A gets 136.0/21 (136–143) and B gets 128.0/22 (128–131); they don't overlap and the ISP keeps 132–135.
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