This LPIC-2 practice question tests your understanding of advanced networking configuration. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 administrator is troubleshooting IPv6 connectivity on an interface with link-local address fe80::1. Which command correctly pings that address from the local host, ensuring the packet uses the correct interface?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "which command"
Why it matters: Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
traceroute6 -i eth0 fe80::1
Why wrong: traceroute6 traces route, does not test reachability.
ping6 fe80::1
Why wrong: Link-local addresses require interface specification.
ping -6 eth0 fe80::1
Why wrong: Incorrect syntax; ping6 is the correct command.
ping6 -I eth0 fe80::1
Binds to interface eth0 for link-local 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
ping6 -I eth0 fe80::1
Option D is correct because the `ping6 -I eth0 fe80::1` command explicitly binds the ICMPv6 echo request to interface `eth0`, which is required when pinging a link-local address (fe80::/10). Link-local addresses are not globally unique; they are scoped to a specific network segment, so the kernel must know which interface to send the packet out of. Without the `-I` option, the system may fail to route the packet or send it out the wrong interface.
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.
traceroute6 -i eth0 fe80::1
Why it's wrong here
traceroute6 traces route, does not test reachability.
ping6 fe80::1
Why it's wrong here
Link-local addresses require interface specification.
ping -6 eth0 fe80::1
Why it's wrong here
Incorrect syntax; ping6 is the correct command.
ping6 -I eth0 fe80::1
Why this is correct
Binds to interface eth0 for link-local address.
Clue confirmation
The clue word "which command" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
The trap here is that candidates assume `ping6` alone works for any IPv6 address, but link-local addresses require an interface specification (via `-I` or a `%` scope ID) because they are not globally routable and the kernel cannot determine the correct interface from the address alone.
Trap categories for this question
Command / output trap
Incorrect syntax; ping6 is the correct command.
Detailed technical explanation
IPv6 link-local addresses (fe80::/10) are inherently scoped to a single link; RFC 4007 defines the concept of zone IDs (e.g., `fe80::1%eth0`) to disambiguate which interface the address belongs to. The `-I` option in `ping6` internally appends the interface index to the destination address, ensuring the ICMPv6 packet is sent via the correct network interface. In a real-world scenario, a system with multiple interfaces (e.g., eth0 and wlan0) might have the same link-local address on both, so without explicit binding, the kernel's routing table may not resolve the correct egress interface.
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 LPIC-2 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
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FAQ
Advanced Networking Configuration — This question tests Advanced Networking Configuration — Read the scenario before looking for a memorised answer..
The correct answer is: ping6 -I eth0 fe80::1 — Option D is correct because the `ping6 -I eth0 fe80::1` command explicitly binds the ICMPv6 echo request to interface `eth0`, which is required when pinging a link-local address (fe80::/10). Link-local addresses are not globally unique; they are scoped to a specific network segment, so the kernel must know which interface to send the packet out of. Without the `-I` option, the system may fail to route the packet or send it out the wrong interface.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "which command". Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 25, 2026
This LPIC-2 practice question is part of Courseiva's free LPI 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 LPIC-2 exam.
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