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300-410 Practice Question: Which TWO statements about DHCPv6 rapid commit…
Which TWO statements about DHCPv6 rapid commit are true? (Choose TWO.)
⚠ Common exam trap
Cisco often tests the misconception that rapid commit reduces the message count from six to four (confusing it with DHCPv4's four-message exchange) or that it is enabled by default, when in fact it must be explicitly configured and reduces the exchange to two messages.
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 includes the Rapid Commit option in the Solicit message to request rapid commit.
RFC 3315 defines the Rapid Commit option (Option 14) that a DHCPv6 client includes in its Solicit message to request a two-message exchange (Solicit/Reply) instead of the normal four-message exchange (Solicit/Advertise/Request/Reply). This reduces latency and is useful in environments where quick address assignment is critical.
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 includes the Rapid Commit option in the Solicit message to request rapid commit.
Why this is correct
Correct. The client sets the Rapid Commit option in the Solicit message to indicate that it wants a two-message exchange.
- ✓
The server must be configured with the 'ipv6 dhcp server rapid-commit' command to honor rapid commit requests.
Why this is correct
Correct. This command enables the server to respond with a Reply message immediately upon receiving a Solicit with the Rapid Commit option.
- ✗
If the server does not support rapid commit, it sends a Reply message with an error code.
Why it's wrong here
Incorrect. If the server does not support rapid commit, it simply ignores the Rapid Commit option and proceeds with the normal four-message exchange (sending an Advertise).
- ✗
Rapid commit reduces the DHCPv6 exchange from six messages to four.
Why it's wrong here
Incorrect. Rapid commit reduces the exchange from four messages (Solicit, Advertise, Request, Reply) to two (Solicit, Reply).
- ✗
Rapid commit is enabled by default on Cisco IOS DHCPv6 servers.
Why it's wrong here
Incorrect. Rapid commit is not enabled by default; it must be explicitly configured with the 'ipv6 dhcp server rapid-commit' command.
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