You have subnetted a Class C address space of 22055660 using

You have subnetted a Class C address space of 220.55.66.0 using a subnet mask of 255.255.255.192. What is the useable address range for the first subnet?

A. 220.55.66.0 to 220.55.66.63

B. 220.55.66.0 to 220.55.66.62

C. 220.55.66.1 to 220.55.66.63

D. 220.55.66.1 to 220.55.66.62

Solution

D is correct. The subnet mask of 255.255.255.192 borrows the first two bits from the last octet. The first subnet is the 0 subnet, and the second is the 220.55.66.64 subnet. The relevant information regarding the first subnet is the subnet ID (220.55.66.0), the useable range (220.55.66.1 to 220.55.66.62), and the broadcast address (220.55.66.63).

A, B, and C are incorrect. These choices do not fall within the useable range.