COMPUTER NETWORKING

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NETWORK LAYER

INTRODUCTION

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
A n 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?
A
245.248.136.0/21 and 245.248.128.0/22
B
245.248.128.0/21 and 245.248.128.0/22
C
245.248.132.0/22 and 245.248.132.0/21
D
245.248.136.0/24 and 245.248.132.0/21
Explanation: 

Detailed explanation-1: -The 12th bit is set to 0, but we need only half of the 2048 address, 13th bit can be set to be 0 addresses to B is 245.248. 128.0/22. Hence the correct answer is 245.248.

Detailed explanation-2: -A public IP address is an IP address that can be accessed directly over the internet and is assigned to your network router by your internet service provider (ISP). Your personal device also has a private IP that remains hidden when you connect to the internet through your router’s public IP.

Detailed explanation-3: -CIDR Representation-Size of the block = Total number of IP Addresses = 26. To have 26 total number of IP Addresses, 6 bits are required in the Host ID part. So, Number of bits in the Network ID part = 32 – 6 = 26.

There is 1 question to complete.
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