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300-410 Practice Question: In DHCPv6, what is the purpose of the…
In DHCPv6, what is the purpose of the 'managed-config-flag' in Router Advertisement messages?
⚠ Common exam trap
Cisco often tests the distinction between the M flag and the O flag, and the trap here is confusing the 'managed-config-flag' (for addressing + other config) with the 'other-config-flag' (for other config only), leading candidates to incorrectly select option B.
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
✓
It indicates that hosts should use DHCPv6 to obtain their IPv6 address and other configuration parameters.
The 'managed-config-flag' (M flag) in Router Advertisement (RA) messages, as defined in RFC 3315 and RFC 4861, tells hosts to use stateful DHCPv6 for both IPv6 address assignment and other configuration parameters (e.g., DNS servers). When set to 1, hosts must use DHCPv6 to obtain their IPv6 address, overriding SLAAC for addressing. This flag is part of the RA's prefix information option and directly controls whether hosts perform stateful or stateless address configuration.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
It indicates that hosts should use DHCPv6 to obtain their IPv6 address and other configuration parameters.
Why this is correct
The M flag signals stateful DHCPv6, where hosts get both addresses and other info from a DHCPv6 server.
- ✗
It indicates that hosts should use SLAAC for addressing and DHCPv6 for other configuration only.
Why it's wrong here
That is the purpose of the other-config-flag (O flag), not the managed-config-flag.
- ✗
It indicates that the router is a DHCPv6 server.
Why it's wrong here
The flag is used in Router Advertisements to inform hosts, not to advertise the router as a server.
- ✗
It indicates that hosts should use only stateless address autoconfiguration.
Why it's wrong here
The M flag tells hosts to use DHCPv6, not SLAAC alone.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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