hardMultiple Select
300-410 Practice Question: Which TWO statements about DHCPv6 stateless…
Which TWO statements about DHCPv6 stateless autoconfiguration (SLAAC) are true? (Choose TWO.)
⚠ Common exam trap
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.
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.
Option A is correct because in IPv6 stateless address autoconfiguration (SLAAC), hosts form their global unicast addresses by combining a Router Advertisement prefix with an interface identifier, and the prefix is only usable for autoconfiguration when the Autonomous ('A') flag is set in the RA prefix information option. Option B is correct because SLAAC only supplies addressing and default gateway information; additional parameters such as DNS server addresses (RDNSS) can be delivered via DHCPv6 in stateless mode, which is why the 'O' (Other-config) flag exists to tell hosts to query DHCPv6 for other configuration. Option C is wrong because the 'M' (Managed) flag indicates that addresses should be obtained via stateful DHCPv6, not SLAAC; SLAAC does not require it. Option D is wrong because 'ipv6 nd other-config-flag' sets the 'O' flag, not the 'M' flag (the 'M' flag is set with 'ipv6 nd managed-config-flag'). Option E is wrong because SLAAC is defined for IPv6 generally and works over any multicast-capable link type, not only Ethernet.
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
The autonomous address-configuration flag in the Router Advertisement tells hosts to form addresses themselves using the advertised prefix and interface identifier. Without this flag set, hosts will not perform SLAAC and must obtain addresses through stateful DHCPv6 instead.
- ✓
When using SLAAC, DHCPv6 can still be used to provide DNS server information.
Why this is correct
SLAAC supplies only the IPv6 address and default gateway via Router Advertisement; it carries no DNS information. DHCPv6 stateless mode fills that gap, delivering DNS server addresses (and other options) while leaving address assignment to SLAAC, satisfying the requirement that both mechanisms coexist.
- ✗
The 'M' flag in Router Advertisements must be set for SLAAC to operate.
Why it's wrong here
SLAAC relies on the 'A' flag being set; the 'M' flag signals managed DHCPv6 addressing and actually suppresses SLAAC address formation. It is tempting because the 'M' flag does govern DHCPv6 behaviour, and it would be correct when hosts should obtain addresses from a stateful DHCPv6 server.
- ✗
The command 'ipv6 nd other-config-flag' sets the 'M' flag in Router Advertisements.
Why it's wrong here
'ipv6 nd other-config-flag' sets the 'O' flag, which tells hosts to fetch other configuration via DHCPv6; the 'M' flag is set by 'ipv6 nd managed-config-flag'. It is tempting because both flags sit under the same 'ipv6 nd' command family and both influence DHCPv6 usage.
- ✗
SLAAC can only be used on Ethernet interfaces.
Why it's wrong here
SLAAC operates over any multicast-capable IPv6 link, including PPP, Frame Relay and wireless, not Ethernet alone. It is tempting because Ethernet is the common deployment medium, and the statement would hold only in an environment restricted to Ethernet access links.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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