- A
The DHCPv6 server has assigned only an IPv6 address to the client.
Why wrong: The output shows both an IA NA (address) and an IA PD (prefix delegation).
- B
The DHCPv6 server has assigned both an IPv6 address and a prefix delegation to the client.
The IA NA section shows an address assignment, and the IA PD section shows a prefix delegation, both with lifetimes.
- C
The DHCPv6 client is using stateless autoconfiguration (SLAAC) because no address is shown.
Why wrong: An address is shown under IA NA, indicating stateful DHCPv6.
- D
The DHCPv6 server has a pool with only one prefix available.
Why wrong: The output only shows one binding; it does not indicate the size of the pool.
Question 1,315 of 2,152
300-410 DHCP (IPv4 and IPv6) Practice Question
This 300-410 practice question tests your understanding of dhcp (ipv4 and ipv6). 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.
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?
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 DHCPv6 server has assigned both an IPv6 address and a prefix delegation to the client.
The output shows both an IA_NA (Identity Association for Non-temporary Address) with an IPv6 address (2001:DB8:1::100) and an IA_PD (Identity Association for Prefix Delegation) with a prefix (2001:DB8:1::/48). This confirms that the DHCPv6 server has assigned both a global unicast address and a delegated prefix to the client, making option B correct.
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 DHCPv6 server has assigned only an IPv6 address to the client.
Why it's wrong here
The output shows both an IA NA (address) and an IA PD (prefix delegation).
- ✓
The DHCPv6 server has assigned both an IPv6 address and a prefix delegation to the client.
Why this is correct
The IA NA section shows an address assignment, and the IA PD section shows a prefix delegation, both with lifetimes.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The DHCPv6 client is using stateless autoconfiguration (SLAAC) because no address is shown.
Why it's wrong here
An address is shown under IA NA, indicating stateful DHCPv6.
- ✗
The DHCPv6 server has a pool with only one prefix available.
Why it's wrong here
The output only shows one binding; it does not indicate the size of the pool.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between IA_NA (address assignment) and IA_PD (prefix delegation), and candidates may overlook the IA_PD section, assuming only an address was assigned.
Trap categories for this question
Command / output trap
The output shows both an IA NA (address) and an IA PD (prefix delegation).
Detailed technical explanation
How to think about this question
DHCPv6 prefix delegation (RFC 3633) allows a DHCPv6 server to assign a prefix to a requesting router, which can then sub-delegate it to downstream networks. The IA_PD option in the output carries the delegated prefix, while the IA_NA carries the address for the client's own interface. The T1 and T2 timers control renewal and rebinding behavior, and the preferred/valid lifetimes follow RFC 4862.
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 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.
Visual reference
What to study next
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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 DHCPv6 server has assigned both an IPv6 address and a prefix delegation to the client. — The output shows both an IA_NA (Identity Association for Non-temporary Address) with an IPv6 address (2001:DB8:1::100) and an IA_PD (Identity Association for Prefix Delegation) with a prefix (2001:DB8:1::/48). This confirms that the DHCPv6 server has assigned both a global unicast address and a delegated prefix to the client, making option B correct.
What should I do if I get this 300-410 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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Last reviewed: Jul 4, 2026
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