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 interface Gi0/0/0
Gi0/0/0 is in server mode Uses prefix 2001:DB8:1::/64 Rapid-Commit is disabled Preference value: 0 Information refresh option: 86400 DNS server: 2001:DB8::1 Domain name: example.com Active clients: 5 Pool: DHCP_POOL
Based on this output, which statement is correct?
⚠ Common exam trap
Cisco often tests the distinction between DHCPv6 server mode and client mode, and the trap here is that candidates may misinterpret 'Active clients' as a client-side metric or confuse DHCPv6 server operation with SLAAC.
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 router is acting as a DHCPv6 server on Gi0/0/0 and has 5 active clients.
The output shows Gi0/0/0 is in server mode, with a prefix, DNS server, domain name, and a pool named DHCP_POOL. The line 'Active clients: 5' confirms the router is acting as a DHCPv6 server with five active clients. This matches option B exactly.
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 router is acting as a DHCPv6 client on Gi0/0/0.
Why it's wrong here
Server mode, a configured pool and active clients show the router is serving DHCPv6, not requesting configuration as a client. Client mode would appear if the interface were obtaining addresses or options from another DHCPv6 server. The output names server mode explicitly.
- ✓
The router is acting as a DHCPv6 server on Gi0/0/0 and has 5 active clients.
Why this is correct
The output explicitly states "Gi0/0/0 is in server mode", confirming R1 runs DHCPv6 server functions on that interface rather than relay or client mode. The "Active clients: 5" line directly reports five bound clients, satisfying the stem's requirement to identify both the operational role and current lease count.
- ✗
Rapid-Commit is enabled.
Why it's wrong here
The output states Rapid-Commit is disabled, so this contradicts the displayed configuration. Rapid-Commit is a two-message exchange that shortens address assignment latency, and it would be the correct reading only if the line showed it enabled. The value shown is disabled.
- ✗
The interface is using SLAAC for address assignment.
Why it's wrong here
SLAAC forms addresses from router-advertised prefixes without a DHCPv6 server; here the interface explicitly reports server mode with an active pool and five clients, so it is assigning addresses itself. SLAAC would be the answer only if the output showed a client interface relying on Router Advertisements.
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