hardMultiple SelectObjective-mapped
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.
SLAAC (Stateless Address Autoconfiguration) requires the 'A' (Autonomous) flag to be set in Router Advertisements (RAs). This flag tells hosts to generate their own IPv6 address using the prefix in the RA and an interface identifier (e.g., EUI-64 or privacy extension). Without the 'A' flag, hosts will not perform address autoconfiguration via SLAAC.
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
Correct. The 'A' (autonomous) flag in the RA prefix information option indicates that hosts can use SLAAC to generate addresses from that prefix.
- ✓
When using SLAAC, DHCPv6 can still be used to provide DNS server information.
Why this is correct
Correct. Stateless DHCPv6 (with the 'O' flag set) allows hosts to obtain DNS and other parameters from a DHCPv6 server without receiving an address.
- ✗
The 'M' flag in Router Advertisements must be set for SLAAC to operate.
Why it's wrong here
Incorrect. The 'M' (managed) flag indicates that hosts should use stateful DHCPv6 for addresses; SLAAC does not require it.
- ✗
The command 'ipv6 nd other-config-flag' sets the 'M' flag in Router Advertisements.
Why it's wrong here
Incorrect. The 'ipv6 nd other-config-flag' command sets the 'O' (other configuration) flag, not the 'M' flag.
- ✗
SLAAC can only be used on Ethernet interfaces.
Why it's wrong here
Incorrect. SLAAC can be used on any interface that supports IPv6, including serial, tunnel, and wireless interfaces.
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