The correct answer is that the DHCPv6 server is functioning correctly with two active bindings. This is because the output of the **show ipv6 dhcp binding** command displays two distinct clients, each identified by a unique link-local address (FE80::) and DUID, with each client holding a single IA_NA (Identity Association for Non-temporary Addresses) containing a valid IPv6 address from the 2001:DB8:1::/64 prefix. The presence of T1 (302400) and T2 (483840) timers, along with preferred and valid lifetimes, confirms the server is actively managing these bindings according to DHCPv6 standards, not indicating any error or conflict. On the Cisco CCNP ENARSI 300-410 exam, this command tests your ability to **interpret show ipv6 dhcp binding output** to verify server health and address assignment; a common trap is misreading the "unassigned" username field as a problem, when it simply means no user authentication is tied to the binding. Remember the memory tip: "Two clients, two DUIDs, two addresses—that’s a healthy server, not a clue."
300-410 DHCP (IPv4 and IPv6) Practice Question
This 300-410 practice question tests your understanding of dhcp (ipv4 and ipv6). Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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 on Router R1:
IA NA: IA ID 0x00010001, T1 302400, T2 483840
Address: 2001:DB8:1::1000
Preferred lifetime 604800, valid lifetime 2592000
Expires at Mar 08 2020 12:00 AM (2592000 seconds)
Client: FE80::A8BB:CCFF:FE01:0300
DUID: 00030001AABBCC010300
Username: unassigned
IA NA: IA ID 0x00010001, T1 302400, T2 483840
Address: 2001:DB8:1::1001
Preferred lifetime 604800, valid lifetime 2592000
Expires at Mar 08 2020 12:00 AM (2592000 seconds)
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 is functioning correctly with two active bindings.
The output shows two DHCPv6 clients with unique link-local addresses and DUIDs, each assigned a distinct IPv6 address from the 2001:DB8:1::/64 prefix. The presence of valid lifetimes and T1/T2 timers indicates the DHCPv6 server is operating normally, maintaining two active bindings. Option B correctly identifies this as proper server behavior.
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 duplicate addresses to the clients.
Why it's wrong here
The addresses are different (::1000 and ::1001).
✓
The DHCPv6 server is functioning correctly with two active bindings.
Why this is correct
Both clients have unique bindings and valid lifetimes.
Related concept
Read the scenario before looking for a memorised answer.
✗
The DHCPv6 server is not using a pool; addresses are statically assigned.
Why it's wrong here
The output shows dynamic bindings with lifetimes.
✗
The DHCPv6 server has a DUID conflict.
Why it's wrong here
The DUIDs are different for each client.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between duplicate addresses and unique addresses in DHCPv6 binding output, where candidates may mistakenly think two different addresses are duplicates because they share the same prefix or IA ID.
Trap categories for this question
Command / output trap
The output shows dynamic bindings with lifetimes.
Detailed technical explanation
How to think about this question
The DHCPv6 server uses the Identity Association for Non-temporary Addresses (IA_NA) to assign global unicast addresses, with T1 (302400 seconds) and T2 (483840 seconds) defining renewal and rebinding intervals per RFC 3315. The preferred lifetime of 604800 seconds and valid lifetime of 2592000 seconds (30 days) are standard values, and the 'Expires at' field shows the remaining lifetime, confirming the server is actively managing leases. In real-world scenarios, mismatched DUIDs or duplicate address detection (DAD) failures could cause issues, but this output shows clean bindings.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 300-410 question in full detail.
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 is functioning correctly with two active bindings. — The output shows two DHCPv6 clients with unique link-local addresses and DUIDs, each assigned a distinct IPv6 address from the 2001:DB8:1::/64 prefix. The presence of valid lifetimes and T1/T2 timers indicates the DHCPv6 server is operating normally, maintaining two active bindings. Option B correctly identifies this as proper server behavior.
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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