mediumMultiple ChoiceObjective-mapped
300-410 Practice Question: Runs the following command to troubleshoot DHCPv6…
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?
⚠ Common exam trap
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.
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.
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.
- ✗
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.
Visual reference
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Related to this question
Learn chapter
Introduction to ENARSI Exam and Network Fundamentals
Key term
MPLS Layer 3 VPN
A technology that uses Multiprotocol Label Switching to create secure, scalable virtual private networks that connect multiple sites at the network layer, where the service provider manages routing between customer sites.
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Written by Johnson Ajibi, MSc IT Security
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