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220-1201 Practice Question: A technician is setting up a small network for a…
A technician is setting up a small network for a home office. The router's WAN port receives a public IP of 203.0.113.5 from the ISP. The technician configures the LAN with a private IP range. Which of the following is a valid private IP address for the technician to assign to a workstation?
⚠ Common exam trap
A common trap in this question is that 172.32.1.10 appears to be a private address but actually falls outside the 172.16.0.0/12 range, leading candidates to incorrectly select it.
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
✓
192.168.1.10
(192.168.1.10) is correct because it falls within the private IPv4 address range defined by RFC 1918 for Class C networks (192.168.0.0/16). Private IP addresses are reserved for internal LAN use and are not routable on the public internet, making them appropriate for a workstation behind a router performing NAT.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
172.32.1.10
Why it's wrong here
Incorrect. 172.32.1.10 is not in the private range (172.16.0.0 to 172.31.255.255). It is a public address.
- ✓
192.168.1.10
Why this is correct
Correct. 192.168.1.10 is within the private 192.168.0.0/16 range and is commonly used for LANs.
- ✗
203.0.113.10
Why it's wrong here
Incorrect. 203.0.113.10 is a public IP address (often used for documentation) and should not be used on a private LAN.
- ✗
169.254.1.10
Why it's wrong here
Incorrect. 169.254.1.10 is an APIPA address, used only when DHCP fails, not for static assignment.
Visual reference
Quick reference
IPv4 Address Class Summary
| Class | First Octet Range | Default Mask | Networks | Hosts per Network |
|---|---|---|---|---|
| A | 1–126 | /8 (255.0.0.0) | 126 | 16,777,214 |
| B | 128–191 | /16 (255.255.0.0) | 16,384 | 65,534 |
| C | 192–223 | /24 (255.255.255.0) | 2,097,152 | 254 |
| D | 224–239 | N/A | Multicast groups | — |
| E | 240–255 | N/A | Reserved / experimental | — |
127.x.x.x is reserved for loopback. Modern networks use CIDR (classless) rather than classful addressing.
Go deeper
Related to this question
Learn chapter
Network Configuration: IP, DNS, DHCP
Key term
WAN
A Wide Area Network (WAN) is a telecommunications network that connects multiple smaller networks, like local area networks, across large geographical distances.
Key term
Router
A router is a networking device that connects different networks together and directs data traffic between them by choosing the best path for data to travel.
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JA
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.