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300-410 Practice Question: Which TWO configuration steps are required to…
Which TWO configuration steps are required to enable a Cisco IOS router as a stateful DHCPv6 server for clients on interface GigabitEthernet0/0? (Choose TWO.)
⚠ Common exam trap
Cisco often tests the distinction between server-side and client-side DHCPv6 commands, and the trap here is that candidates confuse 'ipv6 dhcp server' (server) with 'ipv6 dhcp client' (client) or think that enabling IPv6 on the interface alone is sufficient for DHCPv6 operation.
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
✓
Configure a DHCPv6 pool with the 'ipv6 dhcp pool POOL_NAME' command and define an address prefix.
Option A is correct because a stateful DHCPv6 server must first define a pool using the global configuration command 'ipv6 dhcp pool POOL_NAME' and then specify the addresses to hand out, typically with an 'address prefix' statement (and other parameters such as DNS via 'dns-server'). Option B is correct because the pool must be bound to the client-facing interface with the interface configuration command 'ipv6 dhcp server POOL_NAME', which activates the router as a DHCPv6 server on GigabitEthernet0/0. Option C is wrong because 'ipv6 dhcp client POOL_NAME' is not valid IOS syntax and would configure the router as a client, not a server. Option D is wrong because 'ipv6 nd managed-config-flag' only tells hosts via Router Advertisement to use DHCPv6 for addressing; it is a client-guidance step, not a required server configuration step. Option E is wrong because 'ipv6 enable' merely activates IPv6 on the interface with a link-local address and is not the mechanism that enables the DHCPv6 server function.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Configure a DHCPv6 pool with the 'ipv6 dhcp pool POOL_NAME' command and define an address prefix.
Why this is correct
Stateful DHCPv6 requires a pool created with 'ipv6 dhcp pool' containing an address prefix, since the server assigns addresses rather than relying on SLAAC. This defines the address space the router leases to clients on GigabitEthernet0/0.
- ✓
Apply the DHCPv6 pool to the interface using 'ipv6 dhcp server POOL_NAME' under the interface configuration.
Why this is correct
The pool must be bound to the interface with 'ipv6 dhcp server POOL_NAME', otherwise the router holds a pool but never responds to Solicit messages on GigabitEthernet0/0. This activates stateful DHCPv6 service on that segment.
- ✗
Configure the interface with 'ipv6 dhcp client POOL_NAME'.
Why it's wrong here
The 'ipv6 dhcp client' command makes the router request configuration from an upstream server, the opposite of serving clients. It tempts engineers because client mode is genuinely used on interfaces acting as DHCPv6 requesters. A stateful server instead needs 'ipv6 dhcp server POOL_NAME' plus a pool defined with address prefix delegation.
- ✗
Set the 'ipv6 nd managed-config-flag' on the interface.
Why it's wrong here
The managed-config-flag only instructs hosts to use DHCPv6 for addresses; it does not configure the server itself. It is tempting because it is required for stateful operation, and would be correct alongside a configured DHCPv6 pool, not as a standalone server-enabling step.
- ✗
Enable IPv6 on the interface with 'ipv6 enable'.
Why it's wrong here
'ipv6 enable' only activates IPv6 processing and generates a link-local address; it does not make the router a stateful DHCPv6 server. It is tempting because it is a prerequisite on client-facing interfaces, and would be correct when configuring a DHCPv6 client or basic IPv6 connectivity.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 300-410 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 300-410 exam.