Nokia Certified Network Associate (NCNA) — Question 55

Network address: 200.12.30.0 -

Network mask: 255.255.255.0 -
Use the information above. You need to create 12 subnetworks supporting 10 host addresses each.
Which extended prefix will meet this requirement?

Answer options

• A. /12
• B. /24
• C. /26
• D. /28
• E. /30

Correct answer: D

Explanation

The correct answer is D (/28) because it provides 16 addresses per subnet, 14 of which can be used for hosts after reserving 2 for the network and broadcast addresses. Options A (/12) and B (/24) do not provide enough subnets for the requirement, while C (/26) offers only 4 usable addresses per subnet, which is insufficient for the specified need.