- A
2001:db8:1::1
The first 32 bits are 2001:0db8, which matches the prefix 2001:db8::/32.
- B
2001:db9::1
Why wrong: The first 32 bits are 2001:0db9, which differs from 2001:0db8, so it is not in the same /32 prefix.
- C
2001:db7::1
Why wrong: The first 32 bits are 2001:0db7, which differs from 2001:0db8.
- D
fe80::1
Why wrong: fe80::1 is a link-local address and belongs to the fe80::/10 prefix, not 2001:db8::/32.
Question 20 of 520
N10-009 Networking Concepts Practice Question
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.
An IPv6 address has the prefix 2001:db8::/32. Which of the following IP addresses belongs to the same prefix?
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
✓
2001:db8:1::1
The prefix 2001:db8::/32 means the first 32 bits of the address must be 2001:0db8. Option A (2001:db8:1::1) expands to 2001:0db8:0001:0000:0000:0000:0000:0001, which matches the first 32 bits exactly, so it belongs to the same /32 prefix.
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.
- ✓
2001:db8:1::1
Why this is correct
The first 32 bits are 2001:0db8, which matches the prefix 2001:db8::/32.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
2001:db9::1
Why it's wrong here
The first 32 bits are 2001:0db9, which differs from 2001:0db8, so it is not in the same /32 prefix.
When this WOULD be correct
If the question specified a prefix of 2001:db8::/28, then 2001:db9::1 would be within the same prefix because the first 28 bits (2001:0db) match, and the next nibble (8 vs 9) is part of the host portion.
- ✗
2001:db7::1
Why it's wrong here
The first 32 bits are 2001:0db7, which differs from 2001:0db8.
When this WOULD be correct
If the question specified a prefix of 2001:db7::/32, then 2001:db7::1 would be a correct address belonging to that prefix.
- ✗
fe80::1
Why it's wrong here
fe80::1 is a link-local address and belongs to the fe80::/10 prefix, not 2001:db8::/32.
When this WOULD be correct
In a question asking for a link-local IPv6 address, fe80::1 would be correct. For example, 'Which of the following is a valid link-local unicast address?'
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The N10-009 exam frequently reuses these exact scenarios with slightly different constraints.
✓2001:db8:1::1Correct answer▾
Why this is correct
The first 32 bits are 2001:0db8, which matches the prefix 2001:db8::/32.
✗2001:db9::1Wrong answer — click to see why▾
Why this is wrong here
The prefix 2001:db8::/32 includes addresses where the first 32 bits are 2001:0db8. Option B, 2001:db9::1, has the third quartet as 0db9, which differs in the 33rd bit, so it is not within the /32 prefix.
★ When this WOULD be the correct answer
If the question specified a prefix of 2001:db8::/28, then 2001:db9::1 would be within the same prefix because the first 28 bits (2001:0db) match, and the next nibble (8 vs 9) is part of the host portion.
Why candidates choose this
Candidates may mistakenly think that only the first two quartets (2001:db8) define the prefix, ignoring that the /32 prefix includes the entire third quartet, so any change in the third quartet (like db9) is outside the prefix.
✗2001:db7::1Wrong answer — click to see why▾
Why this is wrong here
The prefix 2001:db8::/32 includes addresses where the first 32 bits are 2001:0db8. Option C (2001:db7::1) has the third hextet as db7, which differs from db8 in the 33rd bit, so it does not match the /32 prefix.
★ When this WOULD be the correct answer
If the question specified a prefix of 2001:db7::/32, then 2001:db7::1 would be a correct address belonging to that prefix.
Why candidates choose this
Candidates may confuse the prefix length and think that only the first two hextets matter, or they may misread db7 as db8 due to visual similarity.
✗fe80::1Wrong answer — click to see why▾
Why this is wrong here
The prefix 2001:db8::/32 specifies that the first 32 bits must be 2001:0db8. Option D (fe80::1) starts with fe80, which is a link-local address prefix, not matching the required prefix.
★ When this WOULD be the correct answer
In a question asking for a link-local IPv6 address, fe80::1 would be correct. For example, 'Which of the following is a valid link-local unicast address?'
Why candidates choose this
Candidates may confuse different IPv6 address types (global unicast vs. link-local) or misremember the prefix ranges, thinking fe80 falls within the 2001::/16 range.
Analysis generated from the official N10-009blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Common exam traps
Common exam trap: answer the scenario, not the keyword
The N10-009 exam often tests the misconception that the double-colon (::) compresses the prefix itself, leading candidates to incorrectly assume that 2001:db8::/32 matches any address starting with 2001:db8, even if the second hextet is altered (e.g., 2001:db9 or 2001:db7).
Detailed technical explanation
How to think about this question
IPv6 prefixes are expressed in CIDR notation (e.g., /32), where the prefix length indicates the number of fixed bits from the left. The 2001:db8::/32 prefix is reserved for documentation (RFC 3849) and is commonly used in examples and exams. When comparing addresses to a prefix, you must expand any double-colon (::) and compare the first 32 bits (four hextets: 2001:0db8) without modification.
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 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
Got this wrong? Here's your next step.
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
Questions learners often ask
What does this N10-009 question test?
Networking Concepts — This question tests Networking Concepts — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: 2001:db8:1::1 — The prefix 2001:db8::/32 means the first 32 bits of the address must be 2001:0db8. Option A (2001:db8:1::1) expands to 2001:0db8:0001:0000:0000:0000:0000:0001, which matches the first 32 bits exactly, so it belongs to the same /32 prefix.
What should I do if I get this N10-009 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
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
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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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