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300-410 Practice Question: Is troubleshooting a DHCPv4 issue on a Cisco…
A network engineer is troubleshooting a DHCPv4 issue on a Cisco router configured as a DHCP server. Clients on VLAN 10 are unable to obtain IP addresses. The engineer verifies that the DHCP pool is correctly configured and that the router interface facing the clients has 'ip helper-address 192.168.1.1' pointing to the DHCP server. However, the DHCP server is on a different subnet and the router's interface is in a VRF. The DHCP DISCOVER messages are not reaching the server. What is the most likely cause?
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 'ip helper-address' command must be configured under the interface with the VRF name using 'ip helper-address vrf <vrf-name> <server-ip>'.
The DHCP relay agent (the router) must be configured to forward DHCP broadcasts across VRFs using the 'ip helper-address vrf <name>' command, otherwise the packets are dropped because the interface is in a VRF and the helper address is not VRF-aware.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The DHCP pool is missing the 'default-router' command.
Why it's wrong here
Incorrect because the DHCP pool configuration is verified correct, and missing default-router would not prevent DISCOVER messages from reaching the server.
- ✗
The router needs the 'ip dhcp relay information option' command to insert Option 82.
Why it's wrong here
Incorrect because Option 82 is not required for basic DHCP relay; it is used for security and policy, not for basic forwarding.
- ✓
The 'ip helper-address' command must be configured under the interface with the VRF name using 'ip helper-address vrf <vrf-name> <server-ip>'.
Why this is correct
Correct because when the interface is in a VRF, the helper address must specify the VRF to ensure the DHCP broadcast is forwarded into the correct routing table.
- ✗
The DHCP server is not configured with a scope for the client subnet.
Why it's wrong here
Incorrect because the issue is that DISCOVER messages never reach the server, so the server's scope configuration is irrelevant at this point.
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Related to this question
Learn chapter
Introduction to ENARSI Exam and Network Fundamentals
Key term
DHCP Client and Server
A DHCP client is any device that requests network configuration settings from a DHCP server, which automatically assigns IP addresses and other parameters to devices on a network.
Key term
MPLS Layer 3 VPN
A technology that uses Multiprotocol Label Switching to create secure, scalable virtual private networks that connect multiple sites at the network layer, where the service provider manages routing between customer sites.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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