LPIC-2 Advanced Networking Configuration Practice Question
This LPIC-2 practice question tests your understanding of advanced networking configuration. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 is the correct command to add an IPv6 address 2001:db8::1/64 to interface eth0?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
ip -6 addr add 2001:db8::1/64 dev eth0
Option A is correct because the `ip -6 addr add` command is the proper way to add an IPv6 address to an interface using the `ip` tool from the iproute2 suite. The `-6` option restricts the operation to IPv6, and the address must include the prefix length (`/64`) to define the subnet. The `dev eth0` parameter specifies the target interface.
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.
✓
ip -6 addr add 2001:db8::1/64 dev eth0
Why this is correct
Correct syntax with -6 flag and prefix length.
Related concept
Read the scenario before looking for a memorised answer.
✗
ip addr add 2001:db8::1/64 dev eth0
Why it's wrong here
Missing -6 flag; treats address as IPv4 by default.
✗
ip -6 addr add 2001:db8::1 dev eth0
Why it's wrong here
Missing prefix length.
✗
ip link set eth0 ipv6 2001:db8::1/64
Why it's wrong here
Wrong command; ip link set does not set IP addresses.
✗
ifconfig eth0 inet6 add 2001:db8::1/64
Why it's wrong here
ifconfig is deprecated and may not support /64 notation.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often forget the `-6` flag or the prefix length, assuming the `ip` command can infer IPv6 context automatically, or they mistakenly use deprecated `ifconfig` syntax from older Linux distributions.
Trap categories for this question
Command / output trap
Wrong command; ip link set does not set IP addresses.
Detailed technical explanation
How to think about this question
The `ip -6 addr add` command uses the netlink socket to communicate with the kernel, adding the address to the interface's IPv6 address list. The prefix length (`/64`) is critical because IPv6 uses stateless address autoconfiguration (SLAAC) and neighbor discovery (NDP) based on the prefix; a missing prefix can cause routing or neighbor cache issues. In real-world scenarios, omitting the prefix length may result in the address being treated as a host route (/128), breaking connectivity on the subnet.
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 network engineer segments a warehouse floor into three subnets: 20 scanners, 5 printers, and 2 management hosts. Picking the wrong mask wastes addresses or leaves too few usable hosts. Exam questions test whether you can apply CIDR notation, calculate block size, and identify the correct usable-host range for a given prefix.
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.
Advanced Networking Configuration — This question tests Advanced Networking Configuration — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: ip -6 addr add 2001:db8::1/64 dev eth0 — Option A is correct because the `ip -6 addr add` command is the proper way to add an IPv6 address to an interface using the `ip` tool from the iproute2 suite. The `-6` option restricts the operation to IPv6, and the address must include the prefix length (`/64`) to define the subnet. The `dev eth0` parameter specifies the target interface.
What should I do if I get this LPIC-2 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.
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Question Discussion
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