The correct command is ipv6 nd prefix, which is used on a router interface to explicitly advertise a specific IPv6 prefix in Router Advertisement (RA) messages for Stateless Address Autoconfiguration (SLAAC). This command overrides the default prefix that would otherwise be derived from the interface’s own IPv6 address, allowing the engineer to advertise the exact delegated prefix 2001:db8:1:1::/64 as required by the ISP. On the CompTIA Network+ N10-009 exam, this tests your understanding of how SLAAC relies on RA messages to provide addressing information to hosts, and a common trap is confusing this with the ipv6 address command, which configures the interface address but does not control prefix advertisement. Remember that nd stands for neighbor discovery, and the prefix keyword is what specifically pushes the subnet into the RA. A helpful memory tip: think of “nd prefix” as “neighbor discovery’s prefix push” — it’s the command that tells the router, “Advertise this exact prefix, not your own address.”
N10-009 Network Implementation Practice Question
This N10-009 practice question tests your understanding of network implementation. 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.
A network engineer is configuring a router to provide IPv6 addressing via SLAAC for hosts on a subnet. The ISP has delegated a prefix 2001:db8:1::/48 and requires the router to advertise a specific prefix 2001:db8:1:1::/64. Which command must be configured on the router's interface to advertise this prefix?
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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
ipv6 nd prefix
Option A is correct because the 'ipv6 nd prefix' command is used on a router interface to advertise a specific IPv6 prefix in Router Advertisement (RA) messages for Stateless Address Autoconfiguration (SLAAC). This command allows the network engineer to override the default prefix derived from the interface address and explicitly advertise the delegated prefix 2001:db8:1:1::/64 as required by the ISP.
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.
✓
ipv6 nd prefix
Why this is correct
This command configures the prefix to be advertised in Router Advertisements, enabling SLAAC for hosts.
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.
✗
ipv6 address autoconfig
Why it's wrong here
This command is used on a host to obtain an IPv6 address automatically, not on a router to advertise a prefix.
✗
ipv6 unicast-routing
Why it's wrong here
This command enables IPv6 routing on the router but does not advertise a specific prefix.
✗
ipv6 dhcp server
Why it's wrong here
This enables a DHCPv6 server, which is not required for stateless SLAAC.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between host-side SLAAC commands (like 'ipv6 address autoconfig') and router-side prefix advertisement commands (like 'ipv6 nd prefix'), leading candidates to confuse the device role in the SLAAC process.
Trap categories for this question
Command / output trap
This command is used on a host to obtain an IPv6 address automatically, not on a router to advertise a prefix.
Detailed technical explanation
How to think about this question
SLAAC relies on Router Advertisement (RA) messages sent by routers, which by default include the prefix derived from the interface's IPv6 address. The 'ipv6 nd prefix' command (per RFC 4861) allows explicit control over the advertised prefix, including flags for autoconfiguration and on-link status, which is critical when the ISP delegates a larger prefix (e.g., /48) and requires a specific subnet (e.g., /64) to be advertised. In real-world deployments, this command is often used to manage multiple subnets on a single interface or to suppress unwanted prefix advertisements.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this N10-009 question in full detail.
Network Implementation — This question tests Network Implementation — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: ipv6 nd prefix — Option A is correct because the 'ipv6 nd prefix' command is used on a router interface to advertise a specific IPv6 prefix in Router Advertisement (RA) messages for Stateless Address Autoconfiguration (SLAAC). This command allows the network engineer to override the default prefix derived from the interface address and explicitly advertise the delegated prefix 2001:db8:1:1::/64 as required by the ISP.
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.
Are there clue words in this question I should notice?
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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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