- A
Hosts will use DHCPv6 to obtain both their IPv6 address and other configuration parameters like DNS.
The managed-config-flag indicates stateful DHCPv6, and the pool provides an address prefix, so hosts get addresses and other info from DHCPv6.
- B
Hosts will use SLAAC for addressing and DHCPv6 for DNS only.
Why wrong: The managed-config-flag overrides SLAAC for addressing; hosts will use DHCPv6 for addresses, not SLAAC.
- C
The DHCPv6 pool is missing a domain-name, so it will not provide any configuration.
Why wrong: The pool provides an address prefix and DNS server, which is sufficient for basic stateful DHCPv6. Domain name is optional.
- D
The ipv6 nd managed-config-flag command is incompatible with the DHCPv6 server and will cause an error.
Why wrong: The two commands work together; the flag tells hosts to use DHCPv6, and the server provides the service.
Quick Answer
The answer is that hosts will use DHCPv6 to obtain both their IPv6 address and other configuration parameters like DNS. This is correct because the `ipv6 nd managed-config-flag` command sets the Managed Address Configuration flag (M flag) to 1 in Router Advertisement messages, instructing hosts to use stateful DHCPv6 rather than SLAAC for address assignment. Since the DHCPv6 pool also provides a DNS server, the configuration implements DHCPv6 stateful with managed config flag, meaning DHCPv6 handles both addressing and additional parameters. On the Cisco CCNP ENARSI 300-410 exam, this tests your understanding of IPv6 address assignment methods and the distinction between the M flag (managed) and O flag (other configuration). A common trap is confusing the M flag with SLAAC—remember that M=1 means "Managed by DHCPv6" for addresses, while the O flag only requests other config. Memory tip: "M for Mandatory DHCP" for addresses, "O for Optional extras."
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.
Router R4 has the following DHCPv6 configuration:
ipv6 dhcp pool DHCP6_POOL2 address prefix 2001:db8:2::/64 dns-server 2001:db8::1 !
interface GigabitEthernet0/1
ipv6 address 2001:db8:2::1/64 ipv6 dhcp server DHCP6_POOL2 ipv6 nd managed-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 will use DHCPv6 to obtain both their IPv6 address and other configuration parameters like DNS.
The configuration uses the `ipv6 nd managed-config-flag` command, which sets the Managed Address Configuration flag (M flag) in Router Advertisement (RA) messages. When the M flag is set to 1, hosts are instructed to use DHCPv6 (stateful DHCPv6) to obtain their IPv6 addresses, not SLAAC. Additionally, the DHCPv6 pool provides DNS server information, so hosts will use DHCPv6 for both addressing and other configuration parameters like DNS. This matches option A.
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 will use DHCPv6 to obtain both their IPv6 address and other configuration parameters like DNS.
Why this is correct
The managed-config-flag indicates stateful DHCPv6, and the pool provides an address prefix, so hosts get addresses and other info from DHCPv6.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Hosts will use SLAAC for addressing and DHCPv6 for DNS only.
Why it's wrong here
The managed-config-flag overrides SLAAC for addressing; hosts will use DHCPv6 for addresses, not SLAAC.
- ✗
The DHCPv6 pool is missing a domain-name, so it will not provide any configuration.
Why it's wrong here
The pool provides an address prefix and DNS server, which is sufficient for basic stateful DHCPv6. Domain name is optional.
- ✗
The ipv6 nd managed-config-flag command is incompatible with the DHCPv6 server and will cause an error.
Why it's wrong here
The two commands work together; the flag tells hosts to use DHCPv6, and the server provides the service.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between the M flag (managed-config-flag) and the O flag (other-config-flag), where candidates mistakenly think the M flag only affects DNS or that SLAAC is still used for addressing when the M flag is set.
Trap categories for this question
Command / output trap
The two commands work together; the flag tells hosts to use DHCPv6, and the server provides the service.
Detailed technical explanation
How to think about this question
The M flag (Managed Address Configuration flag) in ICMPv6 Router Advertisements (RFC 4861) directs hosts to use stateful DHCPv6 for IPv6 address assignment, overriding SLAAC. The DHCPv6 server on the router responds to Solicit and Request messages from hosts, providing addresses from the configured prefix and additional options like DNS. In real-world scenarios, this is used when an administrator wants centralized control over address allocation, such as in enterprise networks requiring auditing or static-like assignments.
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 small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
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: Hosts will use DHCPv6 to obtain both their IPv6 address and other configuration parameters like DNS. — The configuration uses the `ipv6 nd managed-config-flag` command, which sets the Managed Address Configuration flag (M flag) in Router Advertisement (RA) messages. When the M flag is set to 1, hosts are instructed to use DHCPv6 (stateful DHCPv6) to obtain their IPv6 addresses, not SLAAC. Additionally, the DHCPv6 pool provides DNS server information, so hosts will use DHCPv6 for both addressing and other configuration parameters like DNS. This matches option A.
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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Same concept, more angles
1 more ways this is tested on 300-410
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. An engineer is troubleshooting a DHCPv6 stateful (DHCPv6) deployment. The router is configured as a DHCPv6 server with a pool for prefix 2001:db8:2::/64. Clients on the LAN are configured to use DHCPv6, but they are not receiving IPv6 addresses. The router interface has 'ipv6 address 2001:db8:2::1/64' and 'ipv6 dhcp server DHCP_POOL'. The engineer sees that the clients are sending SOLICIT messages, but the router sends no REPLY. What is the issue?
hard- A.The interface is missing the 'ipv6 nd managed-config-flag' command.
- ✓ B.The DHCPv6 pool is missing the 'address prefix 2001:db8:2::/64' command.
- C.The router needs the 'ipv6 dhcp relay' command on the interface.
- D.The 'ipv6 unicast-routing' command is missing globally.
Why B: For stateful DHCPv6, the router must also send Router Advertisements with the 'M' (Managed) flag set to indicate that clients should use DHCPv6. Without the 'ipv6 nd managed-config-flag' command, clients may not request addresses via DHCPv6, or the server may not respond appropriately. However, the symptom says clients are sending SOLICIT messages, so they are attempting DHCPv6. The router is not replying, which could be due to a misconfigured pool or the server not being enabled. The most likely cause is that the DHCPv6 pool does not have an 'address prefix' statement, so the server has no addresses to assign.
Last reviewed: Jun 24, 2026
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