Subnetting Questions 41 | Find the maximum number of subnets & host

Subnetting Questions 41

Enter the maximum number of valid subnets and usable hosts per subnet that you can get from the network 192.168.53.0/30

Solution

Hence, the IP Address starts from 192 it indicates it is a Class C Address. and in Class C Address 24 bits are reserved for the network and 8 bits are reserved for the host.

A/Q the CIDR value is 30 it means, there must be 30 network bits. So we have to borrow additional 6 bits from the fourth octet (24 + 6 = 30).

11111111 . 11111111 . 11111111 . 11111100

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

Therefore, the subnet mask is 255.255.255.252

Let’s find the number of Subnets

The formula of calculating the number of subnets is

2ⁿ (n is the number of borrowed network bits)

= 2⁶ = 64

Therefore, the total number of the subnet is 64.

Let’s find the number of the host on each network

The formula for calculating the number of hosts is

2ⁿ – 2 (n is the number of host bits, subtracted 2 because on every network the first IP Address is reserved for the network ID and last IP Address is reserved for the broadcast address)

2² – 2

= 2

Therefore, there is only 2 available host on each network.