CompTIA
N10-009 · Question #159
A network administrator needs to add 255 useable IP addresses to the network. A /24 is currently in use. Which of the following prefixes would fulfill this need?
The correct answer is A. /23. A /23 subnet provides 512 total addresses, of which 510 are usable (subtracting 2 for network and broadcast addresses). This would satisfy the need for 255 additional addresses.
Submitted by yuki_2020· Mar 6, 2026Network Implementation
Question
A network administrator needs to add 255 useable IP addresses to the network. A /24 is currently in use. Which of the following prefixes would fulfill this need?
Options
- A/23
- B/25
- C/29
- D/32
How the community answered
(22 responses)- A77% (17)
- B14% (3)
- C5% (1)
- D5% (1)
Explanation
A /23 subnet provides 512 total addresses, of which 510 are usable (subtracting 2 for network and broadcast addresses). This would satisfy the need for 255 additional addresses.
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