300-410 Infrastructure Services Practice Question
A network engineer is configuring a Cisco router to act as a DHCPv6 server for a dual-stack network. The engineer wants to provide IPv6 addresses to clients and also supply them with DNS server addresses. Which DHCPv6 message type should the server use to send the DNS server information to the clients?
⚠ Common exam trap
Candidates often confuse the Information-request message, which is sent by the client, with the Reply message, which is sent by the server to deliver the requested information.
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
✓
Reply
In DHCPv6, the server uses the Reply message to deliver configuration parameters, including DNS server addresses, to clients. Clients request this information via Information-request or as part of address assignment, and the server responds with a Reply. The other message types serve different purposes in the DHCPv6 protocol exchange.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Solicit
Why it's wrong here
The Solicit message is sent by a client to locate DHCPv6 servers. It is the first message in the DHCPv6 four-message exchange. It does not carry DNS server information; that is provided by the server in a Reply message. Solicit is a client-initiated message.
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Advertise
Why it's wrong here
The Advertise message is sent by a DHCPv6 server in response to a Solicit message from a client, indicating the server's availability. It does not carry configuration information like DNS servers; that is done in the Reply message. Advertise is part of the server discovery process.
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Information-request
Why it's wrong here
The Information-request message is sent by a client to request configuration information other than addresses, such as DNS servers. It is a client-to-server message, not used by the server to send information. The server responds with a Reply message containing the requested information.
- ✓
Reply
Why this is correct
The Reply message is used by the DHCPv6 server to provide configuration information, including IPv6 addresses and DNS server addresses, to the client. It is sent in response to a Request, Renew, Rebind, or Information-request message. This is the correct message type for delivering DNS server information.
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Cisco exam blueprint
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.