- A
fe80::1
fe80::/10 is the prefix for link-local addresses; fe80::1 is a common link-local address.
- B
2001:db8::1
Why wrong: 2001:db8::/32 is reserved for documentation and is a global unicast address.
- C
ff02::1
Why wrong: ff02::1 is the all-nodes multicast address, not a link-local unicast address.
- D
10.0.0.1
Why wrong: 10.0.0.1 is an IPv4 address; it is not a valid IPv6 address.
Question 437 of 520
IPv6 Link-Local Address — fe80::/10 Prefix | Network+ Explained
This N10-009 practice question tests your understanding of networking concepts. 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.
Which of the following IPv6 addresses is a valid link-local address?
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
✓
fe80::1
Option A is correct because link-local addresses in IPv6 always start with the prefix fe80::/10, and fe80::1 is a valid example. These addresses are automatically configured on interfaces for local link communication and are not routable beyond the local network segment.
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.
- ✓
fe80::1
Why this is correct
fe80::/10 is the prefix for link-local addresses; fe80::1 is a common link-local address.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
2001:db8::1
Why it's wrong here
2001:db8::/32 is reserved for documentation and is a global unicast address.
When this WOULD be correct
This would be correct if the question asked for a valid global unicast address or an example of a documentation address (RFC 3849).
- ✗
ff02::1
Why it's wrong here
ff02::1 is the all-nodes multicast address, not a link-local unicast address.
When this WOULD be correct
This option would be correct for a question asking 'Which IPv6 address is used to send traffic to all nodes on the local link?' or 'Which of the following is a well-known IPv6 multicast address?'
- ✗
10.0.0.1
Why it's wrong here
10.0.0.1 is an IPv4 address; it is not a valid IPv6 address.
When this WOULD be correct
If the question were 'Which of the following is a valid private IPv4 address?', then 10.0.0.1 would be correct as it falls within the 10.0.0.0/8 private range.
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.
✓fe80::1Correct answer▾
Why this is correct
fe80::/10 is the prefix for link-local addresses; fe80::1 is a common link-local address.
✗2001:db8::1Wrong answer — click to see why▾
Why this is wrong here
The address 2001:db8::1 is a global unicast address (2001:db8::/32 is reserved for documentation), not a link-local address. Link-local addresses must start with fe80::/10.
★ When this WOULD be the correct answer
This would be correct if the question asked for a valid global unicast address or an example of a documentation address (RFC 3849).
Why candidates choose this
Candidates may confuse the prefix 2001:db8::/32 with link-local prefixes, or mistakenly think any IPv6 address with a double colon is link-local.
✗ff02::1Wrong answer — click to see why▾
Why this is wrong here
ff02::1 is an IPv6 multicast address (all-nodes link-local multicast), not a link-local unicast address. Link-local addresses start with fe80::/10.
★ When this WOULD be the correct answer
This option would be correct for a question asking 'Which IPv6 address is used to send traffic to all nodes on the local link?' or 'Which of the following is a well-known IPv6 multicast address?'
Why candidates choose this
Candidates may confuse link-local addresses with multicast addresses because both are used for local network communication, or they may misremember the prefix fe80 as ff80.
✗10.0.0.1Wrong answer — click to see why▾
Why this is wrong here
This is an IPv4 address, not an IPv6 address. The question specifically asks for a valid IPv6 link-local address, and 10.0.0.1 is in the private IPv4 range.
★ When this WOULD be the correct answer
If the question were 'Which of the following is a valid private IPv4 address?', then 10.0.0.1 would be correct as it falls within the 10.0.0.0/8 private range.
Why candidates choose this
Candidates may confuse IPv4 and IPv6 addressing, or mistakenly think that any private address qualifies as link-local, not realizing link-local is an IPv6 concept with a specific prefix (fe80::/10).
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 distinction between link-local (fe80::/10) and unique local (fc00::/7) or global unicast (2000::/3) addresses, and candidates frequently confuse the fe80 prefix with multicast or documentation ranges.
Detailed technical explanation
How to think about this question
Link-local addresses are derived from the interface's MAC address using EUI-64 or randomly generated (privacy extensions, RFC 4941) and are essential for Neighbor Discovery Protocol (NDP) operations like router solicitation and duplicate address detection. In real-world scenarios, a misconfigured link-local address can prevent IPv6 routing protocols like OSPFv3 or EIGRP for IPv6 from establishing neighbor adjacencies.
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.
- →
Networking Concepts — study guide chapter
Learn the concepts, then practise the questions
- →
Networking Concepts practice questions
Targeted practice on this topic area only
- →
All N10-009 questions
520 questions across all exam domains
- →
CompTIA Network+ N10-009 study guide
Full concept coverage aligned to exam objectives
- →
N10-009 practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Related N10-009 practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Networking Concepts practice questions
Practise N10-009 questions linked to Networking Concepts.
Network Implementation practice questions
Practise N10-009 questions linked to Network Implementation.
Network Operations practice questions
Practise N10-009 questions linked to Network Operations.
Network Security practice questions
Practise N10-009 questions linked to Network Security.
Network Troubleshooting practice questions
Practise N10-009 questions linked to Network Troubleshooting.
Network+ network fundamentals practice questions
Practise N10-009 questions linked to Network+ network fundamentals.
Practice this exam
Start a free N10-009 practice session
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
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: fe80::1 — Option A is correct because link-local addresses in IPv6 always start with the prefix fe80::/10, and fe80::1 is a valid example. These addresses are automatically configured on interfaces for local link communication and are not routable beyond the local network segment.
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 →
Same concept, more angles
1 more ways this is tested on N10-009
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 IPv6 addresses is a link-local address?
easy- A.2001:db8::1
- ✓ B.fe80::1
- C.ff02::1
- D.2000::/3
Why B: Option B (fe80::1) is correct because IPv6 link-local addresses always begin with the prefix fe80::/10, as defined in RFC 4291. These addresses are automatically assigned to every IPv6-enabled interface and are only valid on a single link (subnet), never routed. The address fe80::1 is a common example of a link-local address.
Keep practising
More N10-009 practice questions
- Which of the following network devices operates primarily at Layer 2 of the OSI model and uses MAC addresses to forward…
- Which of the following is a characteristic of UDP when compared to TCP?
- Which of the following security mechanisms requires a user to authenticate before gaining access to the wired network at…
- Which of the following network protocols operates at the Transport layer of the OSI model and provides connection-orient…
- Which of the following is a characteristic of a connectionless protocol at the transport layer?
- A company wants to allow inbound HTTPS traffic to a web server located in the DMZ from the Internet. The firewall has th…
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.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.