CompTIA Network+ (N10-007) — Question 325

The corporate head office has assigned the subnet of 10.1.100.0/24 to a network technician. The technician wants to create subnets for the finance department, human resources, and IT. Given the following device counts:

Finance: 70 devices -

Human resources: 38 devices -

IT: 16 devices -
Which of the following outlines how the technician should allocate the address space given?

Answer options

• A. Finance: 10.1.100.0/21 Human resources: 10.1.100.128/22 IT: 10.1.100.192/23
• B. Finance: 10.1.100.0/23 Human resources: 10.1.100.128/22 IT: 10.1.100.192/21
• C. Finance: 10.1.100.0/25 Human resources: 10.1.100.128/26 IT: 10.1.100.192/27
• D. Finance: 10.1.100.0/26 Human resources: 10.1.100.128/27 IT: 10.1.100.192/28

Correct answer: C

Explanation

The correct answer is C, as it assigns the appropriate subnet sizes for each department based on their device counts. Finance requires at least 70 devices, which can fit in a /25 subnet (128 addresses). Human resources needs 38 devices, fitting well in a /26 subnet (64 addresses), and IT needs 16 devices, which can be accommodated in a /27 subnet (32 addresses). The other options either do not provide enough addresses for the departments or waste address space.