mediumMultiple Choice
300-410 Practice Question: Consider the following DHCPv6 configuration on…
Consider the following DHCPv6 configuration on router R2:
ipv6 dhcp pool DHCP6_POOL dns-server 2001:db8::1 domain-name example.com !
interface GigabitEthernet0/0
ipv6 address 2001:db8:1::1/64 ipv6 dhcp server DHCP6_POOL ipv6 nd other-config-flag
no shutdown
What is the effect of this configuration?
⚠ Common exam trap
Cisco often tests the distinction between the M-flag (stateful DHCPv6) and O-flag (stateless DHCPv6), and the trap here is that candidates confuse the `other-config-flag` with the `managed-config-flag`, leading them to incorrectly think DHCPv6 provides addresses when it only provides other parameters.
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 on this subnet will use SLAAC to obtain their IPv6 address and then use DHCPv6 to get DNS and domain information.
The configuration uses the `ipv6 nd other-config-flag` command, which sets the 'Other Configuration' flag (O-flag) in Router Advertisement (RA) messages. This tells hosts to use Stateless Address Autoconfiguration (SLAAC) for their IPv6 address (based on the prefix in the RA) and then use DHCPv6 (stateless DHCPv6) only to obtain additional parameters like DNS server and domain name, as defined in the DHCPv6 pool.
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 on this subnet will use SLAAC to obtain their IPv6 address and then use DHCPv6 to get DNS and domain information.
Why this is correct
The `ipv6 nd other-config-flag` setting instructs hosts to use stateless address autoconfiguration for their IPv6 address, while the DHCPv6 pool supplies only DNS server and domain-name details. This satisfies the stem's requirement that address assignment remains SLAAC-based, with DHCPv6 restricted to other configuration parameters.
- ✗
Hosts will obtain both their IPv6 address and DNS information from the DHCPv6 pool.
Why it's wrong here
The other-config-flag sets the O bit, directing hosts to use stateless DHCPv6 for DNS and domain-name only; addresses come from SLAAC via the interface prefix. It is tempting because the pool does contain DNS and domain data, but that data is delivered as other-config, not alongside a DHCPv6-assigned address.
- ✗
The DHCPv6 pool is missing the address prefix, so it will not provide any configuration to clients.
Why it's wrong here
A DHCPv6 pool without an address prefix is valid for stateless DHCPv6, supplying only DNS and domain-name while SLAAC handles addressing. It is tempting because stateful pools do require an address prefix, but the other-config-flag here explicitly signals stateless operation, so clients still receive configuration.
- ✗
The ipv6 nd other-config-flag command is ignored because the DHCPv6 server is configured on the interface.
Why it's wrong here
The other-config-flag and ipv6 dhcp server commands operate independently: the flag sets the O bit in RAs, while the server command enables the DHCPv6 service. It is tempting because both touch DHCPv6 on the same interface, but neither disables the other, so the flag is honoured normally.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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