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geeksforgeeks IP Addressing
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closed with the note: see : https://gateoverflow.in/1752/gate2012_34

An Internet Service Provider (ISP) has the following chunk of CIDR-based IP addresses available with it: $245.248.128.0/20$. The ISP wants to give half of this chunk of 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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