LPIC-2 Advanced Networking Configuration Practice Question
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?
⚠ Common exam trap
Candidates often 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.
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
✓
ping6 -I eth0 fe80::1
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.
Answer analysis
Option-by-option breakdown
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.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.