CompTIA Network+ (N10-009) — Question 465

A customer wants to segment the local network into eight sections with 30 devices each. A junior network technician needs to select the appropriate subnet mask for the customer's chosen Class С network. Which of the following meets the requirement?

Answer options

• A. /25
• B. /26
• C. /27
• D. /28

Correct answer: C

Explanation

The correct answer is C (/27) because a /27 subnet mask provides 30 usable IP addresses, which is sufficient for the requirement of 30 devices. A /25 would offer 126 usable addresses, /26 would provide 62, and /28 would only give 14, making them unsuitable for the customer's needs.