- A
The requesting router uses the IA_NA option to request a prefix.
Why wrong: Incorrect. The requesting router uses the IA_PD (Identity Association for Prefix Delegation) option, not IA_NA (non-temporary address).
- B
The delegating router must have a DHCPv6 pool configured with a prefix-delegation statement.
Correct. The delegating router uses a DHCPv6 pool with the 'prefix-delegation' command to define the prefix to be delegated.
- C
The requesting router uses the 'ipv6 dhcp client pd' command on its upstream interface to request a prefix.
Correct. This command enables the requesting router to act as a DHCPv6 prefix delegation client on that interface.
- D
The delegating router must be configured with 'ipv6 dhcp server' under the downstream interface facing the requesting router.
Why wrong: Incorrect. The 'ipv6 dhcp server' command is used on the delegating router's interface facing the requesting router, but the statement is misleading because the delegating router enables DHCPv6 server functionality on the interface connected to the requesting router, not 'downstream' in the sense of LAN clients.
- E
The requesting router can only use the delegated prefix on the interface that received it.
Why wrong: Incorrect. The requesting router can sub-delegate the prefix to downstream interfaces, typically using the 'ipv6 address prefix-from-provider' or similar command to assign /64 subnets from the delegated prefix.
Quick Answer
The correct answer is that the requesting router uses the 'ipv6 dhcp client pd' command on its upstream interface to request a prefix. This is because DHCPv6 prefix delegation separates the roles of a delegating router, which assigns a larger prefix (e.g., a /48) from a configured pool, and a requesting router, which receives that prefix and sub-delegates smaller /64 prefixes to its downstream interfaces. On the Cisco CCNP ENARSI 300-410 exam, this concept tests your understanding of the IA_PD option—distinct from IA_NA for address assignment—and the correct command placement: the delegating router uses 'ipv6 dhcp server' referencing the pool, while the requesting router uses 'ipv6 dhcp client pd' on the upstream interface. A common trap is confusing the requesting router with the delegating router or misapplying the IA_NA option. Memory tip: think "PD for Prefix Delegation, client on the upstream side."
300-410 DHCP (IPv4 and IPv6) Practice Question
This 300-410 practice question tests your understanding of dhcp (ipv4 and ipv6). 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 TWO statements about DHCPv6 prefix delegation are true? (Choose TWO.)
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
The delegating router must have a DHCPv6 pool configured with a prefix-delegation statement.
DHCPv6 prefix delegation allows a delegating router to assign a prefix (e.g., /48) to a requesting router, which then sub-delegates /64 prefixes to downstream interfaces. The requesting router uses the IA_PD option, not IA_NA. The delegating router must be configured with a prefix delegation pool and an interface DHCP configuration referencing that pool. The requesting router typically uses 'ipv6 dhcp client pd' on its upstream interface. The 'ipv6 dhcp server' command is used on the delegating router, not the requesting router.
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.
- ✗
The requesting router uses the IA_NA option to request a prefix.
Why it's wrong here
Incorrect. The requesting router uses the IA_PD (Identity Association for Prefix Delegation) option, not IA_NA (non-temporary address).
- ✓
The delegating router must have a DHCPv6 pool configured with a prefix-delegation statement.
Why this is correct
Correct. The delegating router uses a DHCPv6 pool with the 'prefix-delegation' command to define the prefix to be delegated.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
The requesting router uses the 'ipv6 dhcp client pd' command on its upstream interface to request a prefix.
Why this is correct
Correct. This command enables the requesting router to act as a DHCPv6 prefix delegation client on that interface.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The delegating router must be configured with 'ipv6 dhcp server' under the downstream interface facing the requesting router.
Why it's wrong here
Incorrect. The 'ipv6 dhcp server' command is used on the delegating router's interface facing the requesting router, but the statement is misleading because the delegating router enables DHCPv6 server functionality on the interface connected to the requesting router, not 'downstream' in the sense of LAN clients.
- ✗
The requesting router can only use the delegated prefix on the interface that received it.
Why it's wrong here
Incorrect. The requesting router can sub-delegate the prefix to downstream interfaces, typically using the 'ipv6 address prefix-from-provider' or similar command to assign /64 subnets from the delegated prefix.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Trap categories for this question
Similar concept trap
Incorrect. The requesting router can sub-delegate the prefix to downstream interfaces, typically using the 'ipv6 address prefix-from-provider' or similar command to assign /64 subnets from the delegated prefix.
Command / output trap
Incorrect. The 'ipv6 dhcp server' command is used on the delegating router's interface facing the requesting router, but the statement is misleading because the delegating router enables DHCPv6 server functionality on the interface connected to the requesting router, not 'downstream' in the sense of LAN clients.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- 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 practitioner preparing for the 300-410 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
Got this wrong? Here's your next step.
Identify which 300-410 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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FAQ
Questions learners often ask
What does this 300-410 question test?
DHCP (IPv4 and IPv6) — This question tests DHCP (IPv4 and IPv6) — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The delegating router must have a DHCPv6 pool configured with a prefix-delegation statement. — DHCPv6 prefix delegation allows a delegating router to assign a prefix (e.g., /48) to a requesting router, which then sub-delegates /64 prefixes to downstream interfaces. The requesting router uses the IA_PD option, not IA_NA. The delegating router must be configured with a prefix delegation pool and an interface DHCP configuration referencing that pool. The requesting router typically uses 'ipv6 dhcp client pd' on its upstream interface. The 'ipv6 dhcp server' command is used on the delegating router, not the requesting router.
What should I do if I get this 300-410 question wrong?
Identify which 300-410 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Same concept, more angles
2 more ways this is tested on 300-410
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. An engineer configures DHCPv6 prefix delegation on a Cisco router acting as a requesting client. The router receives a valid IA_PD prefix from the server, but no route for the delegated prefix appears in the routing table. Which is the most likely explanation?
hard- A.DHCPv6 prefix delegation automatically installs a connected route; the issue is a missing 'ipv6 route' command to point the prefix to the DHCP-learned next-hop.
- ✓ B.The router's 'ipv6 dhcp client pd' command does not install a route; the engineer must manually configure a static route for the delegated prefix.
- C.The DHCPv6 server must also send a route option; the requesting client cannot install a route without it.
- D.The router's 'ipv6 unicast-routing' is disabled, preventing route installation.
Why B: DHCPv6 prefix delegation does not automatically install a route for the delegated prefix. The engineer must configure a static route or use a routing protocol to advertise the prefix. This is a common oversight.
Variation 2. A network engineer runs the following command to troubleshoot DHCPv6 address assignment on router R1: R1# show ipv6 dhcp binding Output: Client: FE80::21A:2BFF:FE3C:4D01 DUID: 0003000121A2B3C4D5E6 Username: unassigned VRF: default IA NA: IA ID 0x00040001, T1 302400, T2 483840 Address: 2001:DB8:1::100 Preferred lifetime 604800, valid lifetime 2592000 Expires at Mar 01 2025 12:00 PM (2592000 seconds) IA PD: IA ID 0x00040002, T1 302400, T2 483840 Prefix: 2001:DB8:1::/48 Preferred lifetime 604800, valid lifetime 2592000 Expires at Mar 01 2025 12:00 PM (2592000 seconds) What does this output indicate?
medium- A.The DHCPv6 server has assigned only an IPv6 address to the client.
- ✓ B.The DHCPv6 server has assigned both an IPv6 address and a prefix delegation to the client.
- C.The DHCPv6 client is using stateless autoconfiguration (SLAAC) because no address is shown.
- D.The DHCPv6 server has a pool with only one prefix available.
Why B: The show ipv6 dhcp binding command displays DHCPv6 bindings. This client has both a non-temporary address (IA NA) and a prefix delegation (IA PD). The address 2001:DB8:1::100 and prefix 2001:DB8:1::/48 are assigned with lifetimes.
Last reviewed: Jun 19, 2026
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