- A
169.254.0.0/16
Why wrong: 169.254.0.0/16 is link-local, not private.
- B
192.167.0.0/16
Why wrong: 192.167.0.0 is not private; private is 192.168.0.0/16.
- C
10.0.0.0/8
10.0.0.0/8 is a private IP range.
- D
172.32.0.0/16
Why wrong: 172.32.0.0 is not in the 172.16.0.0/12 range.
Question 368 of 1,000
200-901 Network Fundamentals Practice Question
This 200-901 practice question tests your understanding of network fundamentals. 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.
Which of the following is a private IPv4 address range as defined by RFC 1918?
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
✓
10.0.0.0/8
Option C (10.0.0.0/8) is correct because RFC 1918 reserves this range, along with 172.16.0.0/12 and 192.168.0.0/16, for private IPv4 addressing. These addresses are not routable on the public internet and are intended for use within private networks, such as corporate LANs or home networks.
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.
- ✗
169.254.0.0/16
Why it's wrong here
169.254.0.0/16 is link-local, not private.
- ✗
192.167.0.0/16
Why it's wrong here
192.167.0.0 is not private; private is 192.168.0.0/16.
- ✓
10.0.0.0/8
Why this is correct
10.0.0.0/8 is a private IP range.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
172.32.0.0/16
Why it's wrong here
172.32.0.0 is not in the 172.16.0.0/12 range.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the exact boundaries of RFC 1918 ranges, and the trap here is confusing the 172.16.0.0/12 range with the broader 172.0.0.0/8, leading candidates to select 172.32.0.0/16 as a valid private range.
Detailed technical explanation
How to think about this question
RFC 1918 defines three private blocks: 10.0.0.0/8 (16,777,216 addresses), 172.16.0.0/12 (1,048,576 addresses), and 192.168.0.0/16 (65,536 addresses). These addresses are commonly used in NAT configurations to allow multiple devices to share a single public IP. A subtle behavior is that routers must not forward packets with private source or destination addresses across the public internet, which is enforced by ISPs at their borders.
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 practitioner preparing for the 200-901 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
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this 200-901 question test?
Network Fundamentals — This question tests Network Fundamentals — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: 10.0.0.0/8 — Option C (10.0.0.0/8) is correct because RFC 1918 reserves this range, along with 172.16.0.0/12 and 192.168.0.0/16, for private IPv4 addressing. These addresses are not routable on the public internet and are intended for use within private networks, such as corporate LANs or home networks.
What should I do if I get this 200-901 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.
About these practice questions
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Last reviewed: Jul 4, 2026
This 200-901 practice question is part of Courseiva's free Cisco 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 200-901 exam.
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