mediumMultiple ChoiceObjective-mapped
300-410 Practice Question: Runs the following debug command to troubleshoot…
A network engineer runs the following debug command to troubleshoot a DHCPv4 issue on router R1:
R1# debug ip dhcp server events
Output: DHCPD: DHCPDISCOVER received from 0050.7966.6800 on interface GigabitEthernet0/0 DHCPD: Sending DHCPOFFER to 0050.7966.6800 via GigabitEthernet0/0 DHCPD: DHCPREQUEST received from 0050.7966.6800 DHCPD: No binding found for client 0050.7966.6800 DHCPD: Adding binding for client 0050.7966.6800 DHCPD: Sending DHCPACK to 0050.7966.6800 via GigabitEthernet0/0 DHCPD: DHCPINFORM received from 0050.7966.6800 DHCPD: Sending DHCPACK to 0050.7966.6800 via GigabitEthernet0/0
What does this output indicate?
⚠ Common exam trap
Cisco often tests the distinction between DHCPINFORM and DHCPREQUEST, where candidates mistakenly think DHCPINFORM indicates a failure or that the client is requesting a new IP address, rather than understanding it is a normal request for additional parameters after the client already has an IP.
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 DHCP server successfully assigned an IP address to the client, and the client sent a DHCPINFORM to request additional parameters.
The debug output shows the DHCP server receiving a DHCPDISCOVER, sending a DHCPOFFER, receiving a DHCPREQUEST, creating a new binding, and sending a DHCPACK. The subsequent DHCPINFORM from the client is a standard request for additional configuration parameters (like DNS or domain name) after the client already has an IP address. The server responds with a DHCPACK, confirming successful assignment and parameter delivery.
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 server failed to create a binding for the client.
Why it's wrong here
The output shows 'Adding binding' and 'Sending DHCPACK', indicating successful binding creation.
- ✓
The DHCP server successfully assigned an IP address to the client, and the client sent a DHCPINFORM to request additional parameters.
Why this is correct
The sequence shows a successful DORA process (DISCOVER, OFFER, REQUEST, ACK) followed by an INFORM, which is used to get additional options like DNS servers.
- ✗
The DHCP client is using a relay agent because the DISCOVER was received on a different interface.
Why it's wrong here
The DISCOVER was received on GigabitEthernet0/0, which is the same interface the OFFER and ACK are sent on; no relay is indicated.
- ✗
The DHCP server rejected the DHCPREQUEST because no binding was found.
Why it's wrong here
The server created a new binding and sent an ACK; the 'No binding found' message is normal for a new client.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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