CompTIA Network+ (N10-009) Exam-Style Practice Question 2026

Correct Answer: A. /23
A /23 subnet contains 512 total addresses (2⁹ = 512), yielding 510 usable host addresses. Since a /24 is already in use (256 addresses, 254 usable), expanding to a /23 effectively adds another /24 block — providing the additional 255 usable addresses needed.

B. /25 — Provides only 128 total addresses (126 usable); less than the /24 already in use, not an expansion.
C. /29 — Provides only 8 total addresses (6 usable); far too small.
D. /32 — A host route representing a single IP address; not a subnet at all.

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