CompTIA Network+ (N10-007) — Question 240

A network administrator wants to narrow the scope of a subnet to two usable IP addresses within a class C network. Which of the following is the correct CIDR notation?

Answer options

• A. 10.10.50.0/30
• B. 172.16.20.0/30
• C. 192.1.0.124/30
• D. 192.168.0.192/24
• E. 192.170.10.0/24

Correct answer: C

Explanation

The correct answer is C, 192.1.0.124/30, because a /30 subnet allows for exactly two usable IP addresses. The other options either represent larger subnets or are not in the class C range required for the question.