easyMultiple Choice
300-410 Practice Question: Runs the following command to verify DHCPv4…
A network engineer runs the following command to verify DHCPv4 server conflict detection on router R1:
R1# show ip dhcp conflict
Output:
IP address Detection method Detection time VRF 192.168.1.50 Ping Mar 01 2025 10:00 AM default 192.168.1.75 Gratuitous ARP Mar 01 2025 11:00 AM default
What does this output indicate?
⚠ Common exam trap
Cisco often tests the distinction between 'show ip dhcp conflict' (which logs detected conflicts) and 'show ip dhcp binding' (which shows successfully leased addresses), leading candidates to mistakenly think conflict output indicates successful assignments.
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 has detected two IP address conflicts on the network.
The 'show ip dhcp conflict' command displays IP addresses that the DHCP server has detected as conflicting with another device on the network. The output shows two entries, each with a detection method (Ping or Gratuitous ARP), indicating that the DHCP server identified conflicts for 192.168.1.50 and 192.168.1.75. This confirms that two IP address conflicts have been detected and logged in the DHCP conflict database.
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 has detected two IP address conflicts on the network.
Why this is correct
Each entry in the conflict table represents an address the server detected as already in use, via Ping or Gratuitous ARP probes, and has quarantined from allocation. Two entries therefore indicate two detected conflicts, satisfying the stem's question about the output's meaning.
- ✗
The DHCP server has successfully assigned IP addresses 192.168.1.50 and 192.168.1.75.
Why it's wrong here
Entries in the conflict table mean the server detected these addresses already in use via Ping or Gratuitous ARP and quarantined them, not that assignment succeeded. It tempts because the addresses appear in server output, but conflict logging exists precisely to prevent leasing them.
- ✗
The DHCP server uses only ping to detect conflicts.
Why it's wrong here
The output lists two detection methods, Ping for 192.168.1.50 and Gratuitous ARP for 192.168.1.75, so the server clearly uses both. Ping is the default conflict-detection method, which makes this tempting, but the Gratuitous ARP entry disproves exclusivity.
- ✗
The DHCP server has cleared all conflicts from the database.
Why it's wrong here
Both conflict entries remain listed with their detection timestamps, so nothing has been cleared. The clear ip dhcp conflict command removes entries, which is what this option describes; here the database still holds two active conflicts.
Visual reference
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Related to this question
Learn chapter
Infrastructure Services: DHCP, NAT, and IPv6
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.
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.
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JA
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.