easyMultiple ChoiceObjective-mapped
220-1201 Practice Question: A technician is setting up a small office with 15…
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?
⚠ Common exam trap
CompTIA often tests the distinction between network, broadcast, and usable host addresses within a given CIDR prefix, and the trap here is that candidates may forget that the first and last addresses in a subnet are reserved and not assignable to hosts.
Answer choices
Why each option matters
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
(10.0.0.50) is correct because the router's LAN interface is configured with the IP address 10.0.0.1 and a subnet mask of /24 (255.255.255.0). This defines the network as 10.0.0.0/24, which includes usable host addresses from 10.0.0.1 to 10.0.0.254. 10.0.0.50 falls within this valid host range.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
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10.0.1.50
Why it's wrong here
This IP address, 10.0.1.50, belongs to a different subnet (10.0.1.0/24) than the router's interface, which is implied to be on the 10.0.0.0/24 network. Assigning a host an IP from a different subnet would prevent it from communicating directly with the router and other devices on the intended local network without a Layer 3 device to route between them. This configuration would isolate the host from the rest of the office network.
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10.0.0.0
Why it's wrong here
The IP address 10.0.0.0 represents the network address for the 10.0.0.0/24 subnet. This address is reserved for identifying the entire network segment itself, not for individual hosts within it. Assigning 10.0.0.0 to a device would cause severe network communication issues, as it is used by routing protocols and network management tools to refer to the network as a whole.
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10.0.0.50
Why this is correct
The IP address 10.0.0.50 is a valid host address within the 10.0.0.0/24 subnet. For a /24 subnet, the usable host range extends from 10.0.0.1 to 10.0.0.254, excluding the network address (10.0.0.0) and the broadcast address (10.0.0.255). This address can be successfully assigned to a device, allowing it to communicate on the local network and access the internet via the router.
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10.0.0.255
Why it's wrong here
The IP address 10.0.0.255 is the dedicated broadcast address for the 10.0.0.0/24 subnet. This address is used to send data to all devices simultaneously within that specific network segment, rather than to a single host. Assigning the broadcast address to a host would prevent proper network communication, as it would interfere with the network's ability to send broadcast messages effectively.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 220-1201 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 220-1201 exam.