Subnetting Questions 17 | Find the Subnet Mask, Networks and Host

Subnetting Questions 17

You are working with a network that has the network ID 10.9.0.0 and contains 73 networks. In the next year, you will be adding an additional 27 branch offices to your company. For simplified management, you want to keep the maximum possible hosts per subnet.Which subnet mask should you use?

Solution

As the IP Address starts from 10, it indicates it is a Class A Address.

A/Q we need 73 + 27 = 100 Subnets with maximum host.

So we have to borrow 7 bits from the second octet and the total number of subnet we will get is 2⁷ = 128

11111111.11111110.00000000.00000000

(2⁷ + 2⁶ + 2⁵ + 2⁴ + 2³ + 2² + 2¹ + 2⁰) . (2⁷ + 2⁶ + 2⁵ + 2⁴ + 2³ + 2² + 2¹) . 0 . 0 

Therefore, the subnet mask is 255.254.0.0.

Additional Information

Hence, we have borrowed 7 bits. we have remaining 17 bits reserved for the host.

So, the total number of the host on each subnet is 2¹⁷ – 2 = 

Class A Subnetting Tutorial

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