- A
172.32.1.10
Why wrong: 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.
- B
192.168.1.10
Correct. 192.168.1.10 is within the private 192.168.0.0/16 range and is commonly used for LANs.
- C
203.0.113.10
Why wrong: Incorrect. 203.0.113.10 is a public IP address (often used for documentation) and should not be used on a private LAN.
- D
169.254.1.10
Why wrong: Incorrect. 169.254.1.10 is an APIPA address, used only when DHCP fails, not for static assignment.
Question 418 of 1,020
Private IP Address Ranges (RFC 1918) for CompTIA A+ Core 1
This 220-1201 practice question tests your understanding of ip addressing. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 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?
Quick Answer
The correct answer is 192.168.1.10, as it falls within the RFC 1918 private IP address range of 192.168.0.0/16, which is reserved exclusively for internal local area networks. Private IP address ranges are defined by RFC 1918 to prevent conflicts with public internet addresses, and they include 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16—the latter being the most common for home and small office setups. On the CompTIA A+ Core 1 220-1201 exam, you will often see a scenario where a router’s WAN port gets a public IP from the ISP, and you must identify which LAN address is validly private; a common trap is confusing the 172.16.0.0/12 range with the public 172.x.x.x addresses or forgetting that 192.168.0.0/16 covers all addresses from 192.168.0.0 to 192.168.255.255. To remember the three ranges, think of the mnemonic “10, 172, 192” in ascending order, and note that 192.168 is the only one starting with 192—easy to spot on the exam.
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
Option B (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.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
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.
Common exam traps
Common exam trap: answer the scenario, not the keyword
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.
Detailed technical explanation
How to think about this question
RFC 1918 reserves three blocks for private internets: 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16. The router uses Network Address Translation (NAT) to map multiple private LAN addresses to the single public WAN IP (203.0.113.5), allowing workstations to access the internet. A common real-world mistake is confusing the 172.16.0.0/12 range with the broader 172.0.0.0/8, but only addresses where the second octet is 16–31 are private.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
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.
What to study next
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FAQ
Questions learners often ask
What does this 220-1201 question test?
IP Addressing — This question tests IP Addressing — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: 192.168.1.10 — Option B (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.
What should I do if I get this 220-1201 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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