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?
fe80::1
fe80::/10 is the prefix for link-local addresses; fe80::1 is a common link-local address.
2001:db8::1
Why wrong: 2001:db8::/32 is reserved for documentation and is a global unicast address.
ff02::1
Why wrong: ff02::1 is the all-nodes multicast address, not a link-local unicast address.
10.0.0.1
Why wrong: 10.0.0.1 is an IPv4 address; it is not a valid IPv6 address.
Answer choices
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
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.
ff02::1
Why it's wrong here
ff02::1 is the all-nodes multicast address, not a link-local unicast 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.
Common exam traps
Cisco 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
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.
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: 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.
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.
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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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