hardMultiple ChoiceObjective-mapped
300-410 Practice Question: An engineer configures DHCPv6 prefix delegation…
An engineer configures DHCPv6 prefix delegation on a Cisco router acting as a requesting client. The router receives a valid IA_PD prefix from the server, but no route for the delegated prefix appears in the routing table. Which is the most likely explanation?
⚠ Common exam trap
Cisco often tests the misconception that DHCPv6 prefix delegation automatically installs a route, similar to how DHCPv4 might install a default route, but the `ipv6 dhcp client pd` command only provides prefix assignment, not route installation.
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
✓
The router's 'ipv6 dhcp client pd' command does not install a route; the engineer must manually configure a static route for the delegated prefix.
The `ipv6 dhcp client pd` command on a Cisco router acting as a DHCPv6 prefix delegation client does not automatically install a route for the delegated prefix into the routing table. The command only assigns the prefix to an interface for use (e.g., with `ipv6 address` commands), but the engineer must manually configure a static route pointing to the DHCP-learned next-hop address to populate the routing table.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
DHCPv6 prefix delegation automatically installs a connected route; the issue is a missing 'ipv6 route' command to point the prefix to the DHCP-learned next-hop.
Why it's wrong here
Incorrect: DHCPv6 PD does not install any route automatically; the prefix is only assigned to an interface.
- ✓
The router's 'ipv6 dhcp client pd' command does not install a route; the engineer must manually configure a static route for the delegated prefix.
Why this is correct
Correct: DHCPv6 PD only assigns the prefix to an interface; no route is created. A static route or dynamic routing is needed.
- ✗
The DHCPv6 server must also send a route option; the requesting client cannot install a route without it.
Why it's wrong here
Incorrect: DHCPv6 does not have a route option; routes are configured separately.
- ✗
The router's 'ipv6 unicast-routing' is disabled, preventing route installation.
Why it's wrong here
Incorrect: While unicast routing is needed for forwarding, the absence of a route is due to DHCPv6 PD not creating one.
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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.