Suppose a subnet has a prefix 128.119.44.128/26. Give an example of an IP address from this subnet. If an ISP owns a block of address starting at 128.119.44.64/26 and wants to form 4 subnets of equal size, what prefixes of the form a. b.c. d/x should be used?

Explanation:

(a) Any IP address in range from 128.119.44.128 to 128.119.44.191

(b) 4 subnets of equal size are :

128.119.44.64/28

128.119.44.80/28

128.119.44.96/28

128.119.44.112/28

Any IP address within the subnet 128.119.44.128/26 and 128.119.44.191/26 network addresses.

The four equal subnets derived from the subnet 128.119.44.64/26 are,

128.119.44.64/28, 128.119.44.80/28, 128.119.44.96/28 and 128.119.44.112/28.

Explanation:

The IP addresses in the subnet 128.119.44.128/26 is gotten from the mask and number of required host or subnet. The subnet is given by the formula 2^n ( where n is the number of borrowed bits from the fourth octet) and the host formula is 2^n -2, where n is the number of zeros on the fourth octet and two is minus fro the value representing the network and broadcast addresses of the network address.

Subnets of a network address can be created for variable length subnets network addresses ( as in 128.119.44.64/26 specified in the question.