Nokia Certified Network Associate (NCNA) — Question 57

What is the most specific aggregate prefix for the following 4 subnets?
100.1.1.4/30
100.1.1.8/30
100.1.1.12/30
100.1.1.16/30

Answer options

• A. 100.1.1.0/25
• B. 100.1.1.0/26
• C. 100.1.1.0/27
• D. 100.1.1.0/28

Correct answer: C

Explanation

The correct answer is C (100.1.1.0/27) because it encompasses the addresses of all provided subnets without including any additional addresses. Options A and B are too broad as they cover more addresses than necessary, while option D does not include all the subnets listed.