Quick Answer
The correct answer is 10.0.0.50, because a /24 subnet mask defines the network as 10.0.0.0 with a usable host range of 10.0.0.1 through 10.0.0.254, and 10.0.0.50 falls squarely within that range without being reserved for the network ID or broadcast address. This concept tests your understanding of subnet boundaries and private IP addressing, a core objective on the CompTIA A+ Core 1 220-1201 exam. A common trap is assuming any address starting with 10 is valid, but the /24 mask strictly limits the valid IP address on a /24 subnet to the last octet between 1 and 254. Remember, the network address (ending in .0) and the broadcast address (ending in .255) are never assignable to a workstation. For a quick memory tip, think “.0 is the network, .255 is the shout, everything in between is what you’re about.”
This 220-1201 practice question tests your understanding of ip addressing. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A technician is setting up a small office with 15 devices and needs to assign private IP addresses. The router's LAN interface is 10.0.0.1/24. Which of the following is a valid IP address for a workstation on this network?
10.0.1.50
Why wrong: 10.0.1.50 is on the 10.0.1.0/24 subnet, not the 10.0.0.0/24 subnet of the router.
10.0.0.0
Why wrong: 10.0.0.0 is the network address and is reserved; it cannot be assigned to a host.
10.0.0.50
10.0.0.50 is within the valid host range of 10.0.0.1 to 10.0.0.254 for the /24 subnet.
10.0.0.255
Why wrong: 10.0.0.255 is the broadcast address for the /24 subnet and cannot be assigned to a host.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
10.0.0.50
The /24 subnet means the network is 10.0.0.0 with a range of 10.0.0.1 to 10.0.0.254. 10.0.0.50 falls within this range and is not reserved. This tests understanding of private IP ranges and subnet boundaries.
Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
10.0.1.50
Why it's wrong here
10.0.1.50 is on the 10.0.1.0/24 subnet, not the 10.0.0.0/24 subnet of the router.
10.0.0.0
Why it's wrong here
10.0.0.0 is the network address and is reserved; it cannot be assigned to a host.
10.0.0.50
Why this is correct
10.0.0.50 is within the valid host range of 10.0.0.1 to 10.0.0.254 for the /24 subnet.
Related concept
CIDR notation defines the prefix length.
10.0.0.255
Why it's wrong here
10.0.0.255 is the broadcast address for the /24 subnet and cannot be assigned to a host.
Common exam traps
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Detailed technical explanation
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
Key takeaway
Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Real-world example
A network engineer segments a warehouse floor into three subnets: 20 scanners, 5 printers, and 2 management hosts. Picking the wrong mask wastes addresses or leaves too few usable hosts. Exam questions test whether you can apply CIDR notation, calculate block size, and identify the correct usable-host range for a given prefix.
What to study next
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related 220-1201 subnetting questions on CIDR, address ranges, and subnet selection.
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FAQ
IP Addressing — This question tests IP Addressing — CIDR notation defines the prefix length..
The correct answer is: 10.0.0.50 — The /24 subnet means the network is 10.0.0.0 with a range of 10.0.0.1 to 10.0.0.254. 10.0.0.50 falls within this range and is not reserved. This tests understanding of private IP ranges and subnet boundaries.
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related 220-1201 subnetting questions on CIDR, address ranges, and subnet selection.
CIDR notation defines the prefix length.
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Last reviewed: Jun 18, 2026
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