Quick Answer
The correct answer is 10.10.10.1, as it falls within the RFC 1918 private IP address range for Class A, which is defined as 10.0.0.0/8. This means any address from 10.0.0.0 through 10.255.255.255 is reserved exclusively for internal network use and is not routable on the public internet. On the CompTIA Network+ N10-009 exam, you will often see questions that test your ability to distinguish these private ranges from public or link-local addresses, with a common trap being addresses like 172.16.0.1 or 192.168.1.1 that belong to Class B and C ranges respectively. To lock in the Class A range, remember the mnemonic “10 is the one” — only the 10.x.x.x block uses the /8 prefix, giving you over 16 million private hosts.
This N10-009 practice question tests your understanding of networking concepts. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 network engineer is reviewing RFC 1918 address ranges to plan a private IP addressing scheme. Which of the following IP addresses falls within the private address space for Class A?
172.16.0.1
Why wrong: 172.16.0.1 is in the Class B private range (172.16.0.0/12), not Class A.
192.168.1.1
Why wrong: 192.168.1.1 is in the Class C private range (192.168.0.0/16), not Class A.
10.10.10.1
10.10.10.1 falls within the 10.0.0.0/8 block, which is the Class A private address space defined in RFC 1918.
172.32.0.1
Why wrong: 172.32.0.1 is not within the 172.16.0.0/12 private block; it falls outside the private range.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
10.10.10.1
Option C is correct because RFC 1918 defines the Class A private address range as 10.0.0.0/8, which includes all addresses from 10.0.0.0 to 10.255.255.255. 10.10.10.1 falls within this range, making it a valid private IP address for internal network use.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
172.16.0.1
Why it's wrong here
172.16.0.1 is in the Class B private range (172.16.0.0/12), not Class A.
192.168.1.1
Why it's wrong here
192.168.1.1 is in the Class C private range (192.168.0.0/16), not Class A.
10.10.10.1
Why this is correct
10.10.10.1 falls within the 10.0.0.0/8 block, which is the Class A private address space defined in RFC 1918.
Related concept
Read the scenario before looking for a memorised answer.
172.32.0.1
Why it's wrong here
172.32.0.1 is not within the 172.16.0.0/12 private block; it falls outside the private range.
Common exam traps
The trap here is that candidates often confuse the Class B private range (172.16.0.0/12) with any 172.x.x.x address, forgetting that only 172.16.0.0 through 172.31.255.255 are private, while 172.32.0.0 and above are public.
Detailed technical explanation
RFC 1918 reserves three blocks for private internets: 10.0.0.0/8 (Class A), 172.16.0.0/12 (Class B), and 192.168.0.0/16 (Class C). The 10.0.0.0/8 block provides over 16 million addresses, making it ideal for large enterprise networks. In practice, NAT (Network Address Translation) is used to map these private addresses to public IPs for internet access, and misconfiguring the subnet mask (e.g., using /16 instead of /8) can inadvertently overlap with public address space.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the N10-009 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Networking Concepts — This question tests Networking Concepts — Read the scenario before looking for a memorised answer..
The correct answer is: 10.10.10.1 — Option C is correct because RFC 1918 defines the Class A private address range as 10.0.0.0/8, which includes all addresses from 10.0.0.0 to 10.255.255.255. 10.10.10.1 falls within this range, making it a valid private IP address for internal network use.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
About these practice questions
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Same concept, more angles
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. Which of the following IP addresses is a private IP address as defined by RFC 1918?
easyWhy C: Option C (192.168.1.1) is correct because RFC 1918 reserves the 192.168.0.0/16 block (192.168.0.0 – 192.168.255.255) for private use within local networks. This address is not routable on the public internet, making it suitable for internal LAN addressing.
Last reviewed: Jun 11, 2026
This N10-009 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 N10-009 exam.
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