A customer asks you to create a subnet mask for their networ

A customer asks you to create a subnet mask for their network, making sure address space is conserved as much as possible. Each subnet must support 12 hosts, and the address space given is 199.16.7.0. Which of the following answers best fits the customer’s needs?

A. 255.255.255.248, creating 14 subnets and providing 14 hosts per subnet

B. 255.255.255.240, creating 14 subnets and providing 14 hosts per subnet

C. 255.255.255.240, creating 16 subnets and providing 14 hosts per subnet

D. 255.255.255.224, creating eight subnets and providing 30 hosts per subnet

Solution

C.255.255.255.240, creating 16 subnets and providing 14 hosts per subnet is the best choice and providing the best subnets needed to the host supported\" range.

Because 16 subnets created by 240 masks, leave 4 bits for up to 14 hosts.