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::A8BB:CCFF:FE01:0200 DUID: 00030001AABBCC010200
Username: unassigned
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)
Based on this output, which statement is correct?
⚠ Common exam trap
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.
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 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.
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.
- ✗
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.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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