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

Question

​​​​​​​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 $B$?

• A. $245.248.136.0/21 \text{ and } 245.248.128.0/22$
• B. $245.248.128.0/21 \text{ and } 245.248.128.0/22$
• C. $245.248.132.0/22 \text{ and } 245.248.132.0/21$
• D. $245.248.136.0/24 \text{ and } 245.248.132.0/21$

Comments

 i am getting 245.248.136.0/21 and 245.248.128.0/22

---

@kallu singh

Explain your answer please, how u r getting (b)  as correct option.

 

---

option A

refer : https://gateoverflow.in/1752/gate2012-34-isro-dec2017-32