mediumMultiple ChoiceObjective-mapped
300-410 Practice Question: Runs the following command on Router R1: R1# show…
A network engineer runs the following command on Router R1:
R1# show ipv6 dhcp binding
Client: FE80::1 DUID: 0003000100AABBCCDDEE
Username: unknown
IA NA: IA ID 0x00010001, T1 302400, T2 483840 Address: 2001:DB8:1::100/128 Preferred lifetime 604800, valid lifetime 2592000 Expires at Sep 15 2024 12:00 PM (2592000 seconds)
Based on this output, which statement is correct?
⚠ Common exam trap
Cisco often tests the distinction between stateful DHCPv6 and SLAAC by showing a DHCPv6 binding output, leading candidates to mistakenly think SLAAC is in use when the presence of an IA NA and assigned address clearly indicates DHCPv6.
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 client has been assigned an IPv6 address via DHCPv6.
The output shows a DHCPv6 binding entry with an IA NA (Identity Association for Non-temporary Addresses) containing an assigned IPv6 address (2001:DB8:1::100/128) along with preferred and valid lifetimes. This confirms that the client with DUID 0003000100AABBCCDDEE successfully obtained an IPv6 address via stateful DHCPv6, not through SLAAC or any other method.
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 client has been assigned an IPv6 address via DHCPv6.
Why this is correct
The binding shows an IA NA with an assigned address.
- ✗
The client is using SLAAC instead of DHCPv6.
Why it's wrong here
The binding indicates DHCPv6 was used.
- ✗
The client's lease has expired.
Why it's wrong here
The valid lifetime is 2592000 seconds, so it is still valid.
- ✗
The client is not authorized.
Why it's wrong here
The username is unknown, but the binding is still active.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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