- A
192.168.0.0/16
Correct. 192.168.0.0/16 is private.
- B
172.32.0.0/12
Why wrong: This is not private; 172.16.0.0/12 is.
- C
172.15.0.0/12
Why wrong: The private range starts at 172.16.0.0.
- D
11.0.0.0/8
Why wrong: 10.0.0.0/8 is private, not 11.0.0.0/8.
Question 909 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
✓
192.168.0.0/16
RFC 1918 defines private IPv4 address ranges that are not routable on the public Internet. The 192.168.0.0/16 range (192.168.0.0 – 192.168.255.255) is explicitly listed in RFC 1918 as a Class C private block, making option A correct.
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.
- ✓
192.168.0.0/16
Why this is correct
Correct. 192.168.0.0/16 is private.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
172.32.0.0/12
Why it's wrong here
This is not private; 172.16.0.0/12 is.
- ✗
172.15.0.0/12
Why it's wrong here
The private range starts at 172.16.0.0.
- ✗
11.0.0.0/8
Why it's wrong here
10.0.0.0/8 is private, not 11.0.0.0/8.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the exact prefix length of the 172.16.0.0/12 range, and the trap here is that candidates confuse 172.16.0.0/12 with 172.32.0.0/12, mistakenly thinking any 172.x.x.x address is private.
Detailed technical explanation
How to think about this question
RFC 1918 reserves three 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, where a router translates private IPs to a public IP for Internet access. A subtle behavior is that 172.16.0.0/12 actually covers 172.16.0.0 through 172.31.255.255, so addresses like 172.20.0.1 are private, but 172.32.0.1 is not.
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.
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 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: 192.168.0.0/16 — RFC 1918 defines private IPv4 address ranges that are not routable on the public Internet. The 192.168.0.0/16 range (192.168.0.0 – 192.168.255.255) is explicitly listed in RFC 1918 as a Class C private block, making option A correct.
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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