- A
SLAAC requires the 'A' flag to be set in Router Advertisements.
Correct. The 'A' (autonomous) flag in the RA prefix information option indicates that hosts can use SLAAC to generate addresses from that prefix.
- B
When using SLAAC, DHCPv6 can still be used to provide DNS server information.
Correct. Stateless DHCPv6 (with the 'O' flag set) allows hosts to obtain DNS and other parameters from a DHCPv6 server without receiving an address.
- C
The 'M' flag in Router Advertisements must be set for SLAAC to operate.
Why wrong: Incorrect. The 'M' (managed) flag indicates that hosts should use stateful DHCPv6 for addresses; SLAAC does not require it.
- D
The command 'ipv6 nd other-config-flag' sets the 'M' flag in Router Advertisements.
Why wrong: Incorrect. The 'ipv6 nd other-config-flag' command sets the 'O' (other configuration) flag, not the 'M' flag.
- E
SLAAC can only be used on Ethernet interfaces.
Why wrong: Incorrect. SLAAC can be used on any interface that supports IPv6, including serial, tunnel, and wireless interfaces.
DHCPv6 SLAAC Flags and Stateless DHCPv6 for DNS
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 stateless autoconfiguration (SLAAC) are true? (Choose TWO.)
Quick Answer
The answer is that DHCPv6 can still be used to provide DNS server information when using SLAAC. This is correct because SLAAC allows hosts to generate their own IPv6 addresses using the prefix from Router Advertisements (RAs) and a modified EUI-64 or privacy extension, but it does not provide DNS server details; stateless DHCPv6 fills that gap by offering other configuration parameters without assigning addresses. On the Cisco CCNP ENARSI 300-410 exam, this concept tests your understanding of the interaction between the 'A', 'M', and 'O' flags in RAs—specifically, the 'O' flag (set with `ipv6 nd other-config-flag`) signals hosts to use DHCPv6 for DNS and other options, while the 'M' flag indicates stateful DHCPv6 for addresses. A common trap is confusing the 'O' flag with the 'M' flag, or assuming SLAAC precludes any DHCPv6 use. Remember the mnemonic: "A for Auto-address, O for Other-info, M for Managed-address."
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
SLAAC requires the 'A' flag to be set in Router Advertisements.
SLAAC (Stateless Address Autoconfiguration) requires the 'A' (Autonomous) flag to be set in Router Advertisements (RAs). This flag tells hosts to generate their own IPv6 address using the prefix in the RA and an interface identifier (e.g., EUI-64 or privacy extension). Without the 'A' flag, hosts will not perform address autoconfiguration via SLAAC.
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.
- ✓
SLAAC requires the 'A' flag to be set in Router Advertisements.
Why this is correct
Correct. The 'A' (autonomous) flag in the RA prefix information option indicates that hosts can use SLAAC to generate addresses from that prefix.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
When using SLAAC, DHCPv6 can still be used to provide DNS server information.
Why this is correct
Correct. Stateless DHCPv6 (with the 'O' flag set) allows hosts to obtain DNS and other parameters from a DHCPv6 server without receiving an address.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The 'M' flag in Router Advertisements must be set for SLAAC to operate.
Why it's wrong here
Incorrect. The 'M' (managed) flag indicates that hosts should use stateful DHCPv6 for addresses; SLAAC does not require it.
- ✗
The command 'ipv6 nd other-config-flag' sets the 'M' flag in Router Advertisements.
Why it's wrong here
Incorrect. The 'ipv6 nd other-config-flag' command sets the 'O' (other configuration) flag, not the 'M' flag.
- ✗
SLAAC can only be used on Ethernet interfaces.
Why it's wrong here
Incorrect. SLAAC can be used on any interface that supports IPv6, including serial, tunnel, and wireless interfaces.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the confusion between the 'M' (Managed) flag and the 'O' (Other Configuration) flag, as well as the misconception that SLAAC requires DHCPv6 or is restricted to specific interface types, leading candidates to incorrectly select options C or E.
Trap categories for this question
Command / output trap
Incorrect. The 'ipv6 nd other-config-flag' command sets the 'O' (other configuration) flag, not the 'M' flag.
Detailed technical explanation
How to think about this question
SLAAC is defined in RFC 4862 and uses the Neighbor Discovery Protocol (NDP) with Router Advertisements (RAs) that contain prefix information with the Autonomous flag. In a typical enterprise deployment, SLAAC is often combined with stateless DHCPv6 (using the 'O' flag) to provide DNS server addresses via DHCPv6, while hosts still generate their own addresses from the RA prefix. A subtle behavior: if both the 'M' and 'A' flags are set, hosts may use SLAAC for address generation but also request addresses from DHCPv6, leading to potential address duplication if not carefully managed.
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.
What to study next
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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: SLAAC requires the 'A' flag to be set in Router Advertisements. — SLAAC (Stateless Address Autoconfiguration) requires the 'A' (Autonomous) flag to be set in Router Advertisements (RAs). This flag tells hosts to generate their own IPv6 address using the prefix in the RA and an interface identifier (e.g., EUI-64 or privacy extension). Without the 'A' flag, hosts will not perform address autoconfiguration via SLAAC.
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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Last reviewed: Jul 4, 2026
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