Subnetting Questions 18 | Find the Subnet Mask, Network ID and Host

Subnetting Questions 18

You are working with a network that is 172.16.0.0 and would like to support 600 hosts per subnet. What subnet mask should you use?

Solution

Hence, the IP Address starts from 172, it indicates it is a Class B Address.

A/Q we need 600 hosts per subnets. So, we have to reserved 10 bits for the host.

2ⁿ – 2

= 2¹⁰ – 2

= 1024 – 2 = 1022 (You will 1022 host per subnets)

Hence, we have reserved 10 bits for host and we have only six bits for the network in second octet.

11111111.11111111.11111100.00000000

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

Therefore, the subnet mask is 255.255.252.0