Which Private IP Address Space Should You Use to Ensure the Minimum Number of Unused IP Addresses?

A network technician needs to subnet the network.

The marketing department has 28 devices.

Which of the following private IP address spaces should be used to ensure the MINIMUM number of unused IP addresses?

A.

Gateway: 10.10.10.1 Netmask: 255.255.255.192

B.

Gateway: 172.15.18.128 Netmask: 255.255.255.224

C.

Gateway: 192.168.1.97 Netmask: 255.255.255.224

D.

Gateway: 224.102.113.65 Netmask: 255.255.255.192

C.

To subnet a network, you need to divide it into smaller subnetworks to efficiently allocate IP addresses and minimize unused addresses. In this question, the network technician needs to subnet a network for the marketing department, which has 28 devices. To ensure the minimum number of unused IP addresses, the network technician should choose a private IP address space that can accommodate at least 28 devices but not more than that.

Option A: Gateway: 10.10.10.1 Netmask: 255.255.255.192 This option uses the Class A private IP address space, which provides a range of 16,777,216 IP addresses. The netmask allows for 64 subnets, with each subnet accommodating up to 62 hosts. This option provides more than enough IP addresses for the marketing department, but it also wastes a lot of IP addresses.

Option B: Gateway: 172.15.18.128 Netmask: 255.255.255.224 This option uses the Class B private IP address space, which provides a range of 65,536 IP addresses. The netmask allows for 8 subnets, with each subnet accommodating up to 30 hosts. This option can accommodate the marketing department's 28 devices, but it still wastes some IP addresses.

Option C: Gateway: 192.168.1.97 Netmask: 255.255.255.224 This option uses the Class C private IP address space, which provides a range of 256 IP addresses. The netmask allows for 8 subnets, with each subnet accommodating up to 30 hosts. This option can accommodate the marketing department's 28 devices with the least number of unused IP addresses.

Option D: Gateway: 224.102.113.65 Netmask: 255.255.255.192 This option uses a multicast IP address, which is not suitable for assigning to hosts on a network. Multicast addresses are used for sending packets to multiple recipients at the same time.

Therefore, option C is the correct answer as it provides a private IP address space that can accommodate the marketing department's 28 devices with the minimum number of unused IP addresses.