300-410 Infrastructure Services Practice Question
A company is deploying IPv6 and wants to use stateful DHCPv6 to assign addresses to clients. The network administrator configures the router with the 'ipv6 dhcp pool' command and sets the 'address prefix' and 'dns-server' options. However, clients are not receiving IPv6 addresses. Which additional configuration is required on the client-facing interface to enable stateful DHCPv6?
⚠ Common exam trap
The trap here is assuming that configuring the DHCPv6 pool and enabling the DHCPv6 server on the interface is enough, but the managed-config-flag in RA is required to direct clients to use stateful DHCPv6.
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
✓
ipv6 nd managed-config-flag
For stateful DHCPv6, the router must set the Managed Address Configuration flag in Router Advertisements. This is done with 'ipv6 nd managed-config-flag' on the client-facing interface. It tells clients to obtain addresses via DHCPv6. The other-config-flag only indicates other parameters are available via DHCPv6, and the DHCP server command alone does not force clients to use DHCPv6 for addresses.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
ipv6 nd managed-config-flag
Why this is correct
The 'ipv6 nd managed-config-flag' command sets the Managed Address Configuration flag in Router Advertisement messages, instructing clients to use DHCPv6 for address assignment. Without this flag, clients will use stateless autoconfiguration and ignore DHCPv6 for addresses. This is required for stateful DHCPv6 operation.
- ✗
ipv6 address autoconfig
Why it's wrong here
The 'ipv6 address autoconfig' command is used on a client interface to enable stateless autoconfiguration. It is not configured on the router. On a router, this command would make the interface act as a client, which is not the goal. It does not enable stateful DHCPv6 server functionality.
- ✗
ipv6 nd other-config-flag
Why it's wrong here
The 'ipv6 nd other-config-flag' sets the Other Configuration flag, which tells clients to use DHCPv6 for other parameters like DNS, but not for addresses. It is used when addresses are assigned via stateless autoconfiguration but additional information is needed from DHCPv6. It does not enable stateful address assignment.
- ✗
ipv6 dhcp server DHCP_POOL
Why it's wrong here
The 'ipv6 dhcp server' command on an interface specifies which DHCPv6 pool to use for assigning addresses and other parameters. However, it does not control whether clients use DHCPv6 for addresses; that is determined by the managed-config-flag. Without the flag, clients may still not request addresses.
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Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Cisco exam blueprint
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