What subnet masks would possibly be used by a network that h

What subnet masks would possibly be used by a network that has an internal subnet with the IP address 128.235.232.160 and a host in another subnet with the IP address 128.235.245.226. (Make a distinction between what is called a network and a subnet). Assume that the entire network would use a single subnet mask, i.e., the same subnet mask on all subnets in the network, and a contiguous subnet mask.

Solution

128.235.232.160 in binary is 10000000.11101011.11101000.10100000

128.235.245.226 in binary is 10000000.11101011.11110101.11100010

Above two ip addresses are having first 19 bits same out of 32 bits.

Putting 1s in place of first 19 common bits and 0s in remaining bits will give us mask

Subnet Mask possibly used be 11111111.11111111.11100000.00000000 that is 255.255.224.0

Network : A classfull IP pool having a default mask

Subnet : Chunks extracted from a network IP pool