Refer to the exhibit. A network engineer has been given the network address of 192.168.99.0 and a subnet mask of 255.255.255.192 to subnet across the four networks shown. How many total host addresses are unused across all four subnets?
- 158
- 200
- 224
- 88
- 72
Explanation: The network IP address 192.168.99.0 and a subnet mask of 255.255.255.192 provides 62 usable IP addresses for each subnet. Subnet A needs 30 host addresses. There are 32 addresses wasted. Subnet B uses 2 of the 62 available IP addresses, because it is a serial link. Consequently, it wastes 60 addresses. Likewise, subnet C wastes 60 addresses. Subnet D needs 14 addresses, so it wastes 48 addresses. The total wasted addresses are 32+60+60+48=200 addresses.