mediumMultiple Choice
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 `show ipv6 dhcp binding` output confirms stateful DHCPv6 address assignment: the server holds a binding for client FE80::1, with DUID, IA NA, and a leased address (2001:DB8:1::100/128) plus T1/T2 timers and lifetimes. Stateless DHCPv6 supplies only options, never address bindings, so the constraint of an assigned address is satisfied.
- ✗
The client is using SLAAC instead of DHCPv6.
Why it's wrong here
The presence of an IA NA binding with a server-assigned address, DUID and T1/T2 timers proves stateful DHCPv6 address assignment occurred. SLAAC produces no server binding entry. This option would be correct if the client had formed its address from a received prefix via router advertisement.
- ✗
The client's lease has expired.
Why it's wrong here
The binding shows a valid lifetime of 2592000 seconds with an expiry timestamp in the future, so the lease remains active. Expired leases are removed from the binding table or shown with zero remaining lifetime. This option would be correct if the Expires field showed a past date.
- ✗
The client is not authorized.
Why it's wrong here
The binding lists Username: unknown, which reflects that no authentication or authorisation was configured for this client, not a rejection. The address was still assigned successfully. This option would be correct if the server had refused the request and no binding existed.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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