The answer is that Stateless DHCPv6 provides DNS server information to clients that obtain their IPv6 address via SLAAC, while DHCPv6 servers listen on UDP port 547 and clients use UDP port 546. This distinction is critical because in stateless mode, the client already has an IPv6 address from SLAAC but still needs additional configuration parameters like DNS, which DHCPv6 supplies without tracking address leases. In contrast, stateful DHCPv6 assigns both the address and other parameters, similar to DHCPv4. On the Cisco CCNP ENARSI 300-410 exam, this concept tests your understanding of DHCPv6 operation ports and modes, often appearing in questions that contrast stateless versus stateful behavior or that ask about correct port assignments. A common trap is confusing DHCPv6 ports with DHCPv4 ports (67/68), so remember: DHCPv6 uses 546 for clients and 547 for servers—think “Client 6, Server 7” as a quick memory tip.
300-410 DHCP (IPv4 and IPv6) Practice Question
This 300-410 practice question tests your understanding of dhcp (ipv4 and ipv6). Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 DHCP IPv6 (DHCPv6) operation are true? (Choose TWO.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
DHCPv6 servers listen on UDP port 547.
DHCPv6 servers listen on UDP port 547, while DHCPv6 clients use UDP port 546. This is defined in RFC 3315 and is a key distinction from DHCPv4, where servers listen on port 67 and clients on port 68. The server uses port 547 to receive requests from clients, ensuring proper separation of DHCPv6 traffic.
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.
✓
DHCPv6 servers listen on UDP port 547.
Why this is correct
DHCPv6 uses UDP port 547 for server communication.
Related concept
Read the scenario before looking for a memorised answer.
✓
Stateless DHCPv6 is used to provide DNS server information to clients that obtain their IPv6 address via SLAAC.
Why this is correct
Stateless DHCPv6 provides additional configuration parameters, not addresses.
Related concept
Read the scenario before looking for a memorised answer.
✗
DHCPv6 can only be used in stateless mode.
Why it's wrong here
DHCPv6 supports both stateful and stateless modes.
✗
DHCPv6 uses UDP ports 67 and 68, just like DHCPv4.
ARP is not used in IPv6; DHCPv6 uses multicast and link-local addresses.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that DHCPv6 uses the same UDP ports as DHCPv4 (67/68) or that it can only run in stateless mode, leading candidates to incorrectly select options D or C.
Detailed technical explanation
How to think about this question
In DHCPv6, the client sends a Solicit message to the All_DHCP_Relay_Agents_and_Servers multicast address (FF02::1:2) on UDP port 547, and the server responds with an Advertise. Stateless DHCPv6 (RFC 3736) is often used alongside SLAAC to provide DNS server information via the DNS Search List (DNSSL) option, while the client’s address is derived from the router’s prefix advertisement. This separation allows flexible deployment where address autoconfiguration and parameter provisioning are handled independently.
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.
TExam Day Tips
→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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 300-410 question in full detail.
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: DHCPv6 servers listen on UDP port 547. — DHCPv6 servers listen on UDP port 547, while DHCPv6 clients use UDP port 546. This is defined in RFC 3315 and is a key distinction from DHCPv4, where servers listen on port 67 and clients on port 68. The server uses port 547 to receive requests from clients, ensuring proper separation of DHCPv6 traffic.
What should I do if I get this 300-410 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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