- A
Hosts on this subnet will use SLAAC to obtain their IPv6 address and then use DHCPv6 to get DNS and domain information.
The other-config-flag indicates that hosts should use SLAAC for addressing and DHCPv6 for additional parameters, which is stateless DHCPv6.
- B
Hosts will obtain both their IPv6 address and DNS information from the DHCPv6 pool.
Why wrong: The other-config-flag means DHCPv6 is only for other configuration, not for address assignment. For address assignment, the managed-config-flag would be needed.
- C
The DHCPv6 pool is missing the address prefix, so it will not provide any configuration to clients.
Why wrong: In stateless DHCPv6, the pool does not need an address prefix; it only provides other parameters like DNS and domain.
- D
The ipv6 nd other-config-flag command is ignored because the DHCPv6 server is configured on the interface.
Why wrong: The flag is not ignored; it works together with the DHCPv6 server to provide stateless configuration.
Quick Answer
The correct answer is that hosts will use SLAAC to obtain their IPv6 address and then use DHCPv6 to get DNS and domain information. This is because the `ipv6 nd other-config-flag` command sets the 'Other Configuration' flag (O-flag) in Router Advertisement messages, which instructs hosts to perform Stateless Address Autoconfiguration for addressing while relying on stateless DHCPv6 only for additional configuration parameters like DNS and domain name, as defined in the DHCPv6 pool. On the Cisco CCNP ENARSI 300-410 exam, this scenario tests your understanding of the critical distinction between the M-flag (managed) and O-flag (other-config) in IPv6 neighbor discovery. A common trap is confusing the O-flag with the M-flag, which would force hosts to use stateful DHCPv6 for both addressing and other parameters. Remember the memory tip: "O-flag = Other stuff only, M-flag = Managed everything."
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.
Consider the following DHCPv6 configuration on router R2:
ipv6 dhcp pool DHCP6_POOL dns-server 2001:db8::1 domain-name example.com !
interface GigabitEthernet0/0
ipv6 address 2001:db8:1::1/64 ipv6 dhcp server DHCP6_POOL ipv6 nd other-config-flag
no shutdown
What is the effect of this configuration?
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
Hosts on this subnet will use SLAAC to obtain their IPv6 address and then use DHCPv6 to get DNS and domain information.
Option A is correct because the configuration uses the `ipv6 nd other-config-flag` command, which sets the 'Other Configuration' flag (O-flag) in Router Advertisement (RA) messages. This tells hosts to use Stateless Address Autoconfiguration (SLAAC) for their IPv6 address (based on the prefix in the RA) and then use DHCPv6 (stateless DHCPv6) only to obtain additional parameters like DNS server and domain name, as defined in the DHCPv6 pool.
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.
- ✓
Hosts on this subnet will use SLAAC to obtain their IPv6 address and then use DHCPv6 to get DNS and domain information.
Why this is correct
The other-config-flag indicates that hosts should use SLAAC for addressing and DHCPv6 for additional parameters, which is stateless DHCPv6.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Hosts will obtain both their IPv6 address and DNS information from the DHCPv6 pool.
Why it's wrong here
The other-config-flag means DHCPv6 is only for other configuration, not for address assignment. For address assignment, the managed-config-flag would be needed.
- ✗
The DHCPv6 pool is missing the address prefix, so it will not provide any configuration to clients.
Why it's wrong here
In stateless DHCPv6, the pool does not need an address prefix; it only provides other parameters like DNS and domain.
- ✗
The ipv6 nd other-config-flag command is ignored because the DHCPv6 server is configured on the interface.
Why it's wrong here
The flag is not ignored; it works together with the DHCPv6 server to provide stateless configuration.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between the M-flag (stateful DHCPv6) and O-flag (stateless DHCPv6), and the trap here is that candidates confuse the `other-config-flag` with the `managed-config-flag`, leading them to incorrectly think DHCPv6 provides addresses when it only provides other parameters.
Detailed technical explanation
How to think about this question
In IPv6, the Router Advertisement (RA) message carries two flags: the Managed Address Configuration flag (M-flag) and the Other Configuration flag (O-flag). Setting only the O-flag (via `ipv6 nd other-config-flag`) indicates that hosts should use SLAAC for addressing (based on the RA prefix) and then contact a DHCPv6 server for additional configuration, such as DNS and domain name. This is defined in RFC 4862 and RFC 3315, and it is commonly used in enterprise networks to reduce DHCPv6 server load while still centrally managing DNS settings.
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 network engineer segments a warehouse floor into three subnets: 20 scanners, 5 printers, and 2 management hosts. Picking the wrong mask wastes addresses or leaves too few usable hosts. Exam questions test whether you can apply CIDR notation, calculate block size, and identify the correct usable-host range for a given prefix.
What to study next
Got this wrong? Here's your next step.
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DHCP (IPv4 and IPv6) — study guide chapter
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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: Hosts on this subnet will use SLAAC to obtain their IPv6 address and then use DHCPv6 to get DNS and domain information. — Option A is correct because the configuration uses the `ipv6 nd other-config-flag` command, which sets the 'Other Configuration' flag (O-flag) in Router Advertisement (RA) messages. This tells hosts to use Stateless Address Autoconfiguration (SLAAC) for their IPv6 address (based on the prefix in the RA) and then use DHCPv6 (stateless DHCPv6) only to obtain additional parameters like DNS server and domain name, as defined in the DHCPv6 pool.
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: Jun 24, 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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