Exam N10-009 topic 1 question 285 discussion

Actual exam question from CompTIA's N10-009

Question #: 285
Topic #: 1

A network administrator needs to assign IP addresses to a newly installed network. They choose 192.168.1.0/24 as their network address and need to create three subnets with 30 hosts on each subnet. Which of the following is a valid subnet mask that will meet the requirements?

A. 255.255.255.128
B. 255.255.255.192
C. 255.255.255.224
D. 255.255.255.240

Show Suggested Answer

Suggested Answer: C 🗳️

by scottytohotty at May 6, 2025, 1:42 p.m.

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MATM2023

1 month ago

Selected Answer: C

My calculation is very fast. 30 hosts + 2 (broadcast + network) = 32 256 - 32 = 224 255.255.255.224 - Answer C

upvoted 3 times

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Joey_Catarozoli

1 month, 1 week ago

Selected Answer: C

C. 255.255.255.224 (/27) (Most voted) Host bits: 5 Hosts: 2 5 − 2 = 30 2 5 −2=30 ✅ Subnets from /24 to /27: 8 subnets ✅ Just meets the host requirement ✔️

upvoted 1 times

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Joey_Catarozoli

1 month, 1 week ago

Selected Answer: C

✅ Correct Answer: C. 255.255.255.224 (/27) — This gives: 8 subnets 30 usable host IPs per subnet It just meets the host requirement and is the most efficient option. 🟩 Answer: C. 255.255.255.224

upvoted 2 times

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