CompTIA Network+ (N10-009) — Question 197

A network engineer implements a 192.168.100.0/25 subnet for a building without obtaining sizing requirements. It is later determined that the building will house 700 people. Which of the following subnet masks will most efficiently support that number of people?

Answer options

• A. 255.255.252.0
• B. 255.255.254.0
• C. 255.255.255.0
• D. 255.255.255.128

Correct answer: A

Explanation

The correct answer is A, 255.255.252.0, because it provides 1024 usable IP addresses, which is sufficient for 700 people. The other options do not provide enough addresses; B offers 512, C provides 256, and D gives only 126 usable addresses, making them inadequate for the requirement.