300-410 Infrastructure Services Practice Question
A network engineer is configuring a branch router to obtain its WAN interface IPv4 address from an ISP using DHCP. The provider requires the router to send a specific client identifier. Which command must be applied under the interface configuration to meet this requirement?
⚠ Common exam trap
Many exam-takers confuse the client identifier (option 61) with the hostname option (option 12), leading to the selection of ip dhcp client hostname instead of the correct client-id command.
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
✓
ip dhcp client client-id ascii BRANCH-ROUTER
The ip dhcp client client-id ascii BRANCH-ROUTER command correctly sets the DHCP client identifier to the ASCII string BRANCH-ROUTER. This is necessary when an ISP requires a specific client identifier for address assignment or authentication. The other options either configure server-side settings or request the identifier from the server, which does not meet the requirement.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
ip dhcp client hostname BRANCH-ROUTER
Why it's wrong here
This command sets the hostname option (option 12) sent to the DHCP server, not the client identifier (option 61). While some ISPs may use the hostname for identification, the requirement specifies the client identifier. The correct command must use the client-id keyword to set option 61.
- ✓
ip dhcp client client-id ascii BRANCH-ROUTER
Why this is correct
The ip dhcp client client-id ascii BRANCH-ROUTER command under the interface configuration sets the DHCP client identifier to the ASCII string BRANCH-ROUTER. This allows the ISP to identify the router uniquely, which is often required for address assignment or authentication. Other options either configure server-side parameters or use incorrect syntax for the client identifier.
- ✗
ip dhcp client request client-id
Why it's wrong here
This command requests that the DHCP server send the client identifier option in its reply, but it does not set the client identifier value that the router sends. The ISP requires the router to send a specific identifier, so the correct command must set the identifier, not request it from the server.
- ✗
ip dhcp pool BRANCH-ROUTER
Why it's wrong here
This command creates a DHCP pool for a DHCP server, not a client. It is used when the router is acting as a DHCP server to assign addresses to clients. The scenario requires the router to act as a DHCP client, so this command is irrelevant and would not affect the client identifier.
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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.