Question

Given the network 192.168.100.0/24, we are going to segment this network into two subnets, Subnet A and Subnet B. The hosts requirement for Subnet A is 90 and for Subnet B is 20. Calculate below

Subnet A:

Subnet Mask in decimal & Binary:
Number of Useable Hosts in this Subnet
IP Network Address
First valid IP Address
Last valid IP Address
Subnet Broadcast IP Address

Subnet B:

Subnet Mask in Decimal and Binary:
Number of Useable Hosts in this Subnet
IP Network Address
First valid IP Address
Last valid IP Address
Subnet Broadcast IP Address

Answer 1

192.168.100.0/24 this is class c netrwork

Note: subnet mask is calculated based on number no.of 1's in the IP address.

Here we need we are dividing the net by power of 2.

that's why i divided the network as 2^7 =128 instead of 90(Subnet A)

Now my network mask also will change so now

so instead of using 8 bits i'm using 7 bits for this reason i'm adding the 1 bit to network mask

now my networkmask is 25