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Exam N10-009 topic 1 question 384 discussion

Actual exam question from CompTIA's N10-009
Question #: 384
Topic #: 1
[All N10-009 Questions]

A network administrator is creating a subnet that will include 45 separate hosts on a small private network within a large network architecture. Which of the following options is the most efficient use of network addresses when assigning this network?

  • A. 10.0.50.128/25
  • B. 10.7.142.128/27
  • C. 10.152.4.192/26
  • D. 10.192.1.64/28
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Suggested Answer: C 🗳️
by Jstark111 at May 8, 2025, 11:46 p.m.

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Jstark111
1 month, 2 weeks ago
Selected Answer: C
A /26 subnet provides 64 total IP addresses, with 62 usable host addresses (after subtracting network and broadcast addresses). You need support for 45 hosts, so a /26 subnet is the smallest subnet that meets that requirement efficiently. Breakdown of the options: A. /25 = 126 usable hosts → more than needed (less efficient) B. /27 = 30 usable hosts → not enough C. /26 = 62 usable hosts → ✅ just right D. /28 = 14 usable hosts → not enough
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