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UGC NET CSE | December 2018 | Part 2 | Question: 87

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​​​​​​​An Internet Service Provider $(ISP)$ has following chunk of $CIDR-$based $IP$ addresses available with it :$245.248.128.0/20$. The $ISP$ wants to give half of this chunk addresses to organization $A$ and a quarter to organization $B$ while retaining the remaining with itself. Which of the following is a valid allocation of addresses to $A$ and $B$?

  1. $245.248.136.0/21 \text{ and } 245.248.128.0/22$
  2. $245.248.128.0/21 \text{ and } 245.248.128.0/22$
  3. $245.248.132.0/22 \text{ and } 245.248.132.0/21$
  4. $245.248.136.0/24 \text{ and } 245.248.132.0/21$
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