CompTIA N10-009 Exam - Topic 2 Question 19 Discussion

Actual exam question for CompTIA's N10-009 exam

Question #: 19
Topic #: 2

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?

A255.255.255.128

B255.255.255.192

C255.255.255.224

D255.255.255.240

Show Suggested Answer

Suggested Answer: B

To create three subnets with at least 30 hosts each:

Subnet Calculation: Each subnet must support 32 addresses (30 usable + 2 reserved for network and broadcast).

Bits for Subnets: Subnet mask 255.255.255.192 (/26) provides 64 addresses per subnet (4 subnets total).

Valid Subnets: Each subnet provides sufficient IPs to meet the requirement.

255.255.255.128 (A): Creates only 2 subnets, not enough for the requirement.

255.255.255.224 (C): Provides 8 subnets but only 30 addresses per subnet (28 usable), insufficient for hosts.

255.255.255.240 (D): Too restrictive, only 16 addresses per subnet (14 usable).

by Lacresha at Jan 26, 2025, 01:15 AM

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Gladys

7 months ago

Not sure about that, seems tight for 30 hosts each!

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Herminia

8 months ago

Wait, can we really fit 3 subnets in that range?

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Hyun

8 months ago

I thought it was C, but B makes more sense.

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Loren

8 months ago

Definitely B (255.255.255.192) for 62 hosts!

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Lina

8 months ago

The subnet mask needs to allow for at least 30 hosts.

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Valentine

9 months ago

I’m not sure if 255.255.255.240 is too restrictive for our needs. It only allows for 14 hosts, which definitely won't work for three subnets.

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Soledad

9 months ago

I think we did a similar question in class, and I recall that 255.255.255.224 gives us 30 usable hosts, so that might be the right choice here.

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Tamekia

9 months ago

I'm a bit unsure about the subnet masks. I feel like 255.255.255.192 could work since it allows for 64 addresses, but I'm not completely confident.

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Margarita

9 months ago

I remember we practiced subnetting, and I think we need at least 5 bits for hosts to get 30 addresses. That might help narrow down the options.

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Oren

9 months ago

Okay, I've got this. The network address is 192.168.1.0/24, and we need to create three subnets with 30 hosts each. The subnet mask that will meet these requirements is 255.255.255.192.

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Ronny

9 months ago

Ah, subnetting! I remember learning about this in my networking class. Let me think through the requirements and see if I can determine the correct subnet mask.

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Cory

9 months ago

Hmm, I'm a bit unsure about this one. Subnetting can get tricky, but I'll try to break it down step-by-step and see if I can figure it out.

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Son

9 months ago

This looks like a straightforward subnetting question. I'll need to calculate the number of hosts required per subnet and then choose the appropriate subnet mask.

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