- A
The client includes the Rapid Commit option in the Solicit message to request rapid commit.
Correct. The client sets the Rapid Commit option in the Solicit message to indicate that it wants a two-message exchange.
- B
The server must be configured with the 'ipv6 dhcp server rapid-commit' command to honor rapid commit requests.
Correct. This command enables the server to respond with a Reply message immediately upon receiving a Solicit with the Rapid Commit option.
- C
If the server does not support rapid commit, it sends a Reply message with an error code.
Why wrong: 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).
- D
Rapid commit reduces the DHCPv6 exchange from six messages to four.
Why wrong: Incorrect. Rapid commit reduces the exchange from four messages (Solicit, Advertise, Request, Reply) to two (Solicit, Reply).
- E
Rapid commit is enabled by default on Cisco IOS DHCPv6 servers.
Why wrong: Incorrect. Rapid commit is not enabled by default; it must be explicitly configured with the 'ipv6 dhcp server rapid-commit' command.
Quick Answer
The correct answer is that the server must be configured with the `ipv6 dhcp server rapid-commit` command to honor rapid commit requests. This is true because DHCPv6 rapid commit, defined in RFC 3315, enables a streamlined two-message exchange—Solicit and Reply—instead of the standard four-message process. The client signals support by including a Rapid Commit option in its Solicit message, but the server must explicitly enable this feature; otherwise, it ignores the option and the client falls back to the normal exchange. On the Cisco CCNP ENARSI 300-410 exam, this topic tests your understanding of DHCPv6 optimization and configuration nuances—a common trap is assuming the client needs a separate command, but it does not. Remember the memory tip: “Client asks, server commits—only the server needs the `rapid-commit` fit.”
300-410 DHCP (IPv4 and IPv6) Practice Question
This 300-410 practice question tests your understanding of dhcp (ipv4 and ipv6). This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Which TWO statements about DHCPv6 rapid commit are true? (Choose TWO.)
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.
DHCPv6 rapid commit (RFC 3315) allows a two-message exchange (Solicit + Reply) instead of the normal four-message exchange (Solicit, Advertise, Request, Reply). The client indicates support by including a Rapid Commit option in the Solicit message. The server must also support and be configured for rapid commit. If the server does not support it, it ignores the option and the client falls back to the normal four-message exchange. The 'ipv6 dhcp server rapid-commit' command enables rapid commit on the server. The client does not need explicit configuration; it includes the option automatically if it supports it.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
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.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
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.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Trap categories for this question
Command / output trap
Incorrect. Rapid commit is not enabled by default; it must be explicitly configured with the 'ipv6 dhcp server rapid-commit' command.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the 300-410 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which 300-410 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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FAQ
Questions learners often ask
What does this 300-410 question test?
DHCP (IPv4 and IPv6) — This question tests DHCP (IPv4 and IPv6) — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The client includes the Rapid Commit option in the Solicit message to request rapid commit. — DHCPv6 rapid commit (RFC 3315) allows a two-message exchange (Solicit + Reply) instead of the normal four-message exchange (Solicit, Advertise, Request, Reply). The client indicates support by including a Rapid Commit option in the Solicit message. The server must also support and be configured for rapid commit. If the server does not support it, it ignores the option and the client falls back to the normal four-message exchange. The 'ipv6 dhcp server rapid-commit' command enables rapid commit on the server. The client does not need explicit configuration; it includes the option automatically if it supports it.
What should I do if I get this 300-410 question wrong?
Identify which 300-410 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jun 19, 2026
This 300-410 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 300-410 exam.
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