- A
The DHCP server has detected two IP address conflicts on the network.
Two IP addresses are listed with detection methods and times, indicating conflicts.
- B
The DHCP server has successfully assigned IP addresses 192.168.1.50 and 192.168.1.75.
Why wrong: These addresses are in conflict, meaning they were not assigned due to detection of another device using them.
- C
The DHCP server uses only ping to detect conflicts.
Why wrong: Both ping and gratuitous ARP are shown as detection methods.
- D
The DHCP server has cleared all conflicts from the database.
Why wrong: The output shows two conflicts, so they have not been cleared.
Question 1,751 of 2,152
DHCPv4 Conflict Detection: show ip dhcp conflict Output
This 300-410 practice question tests your understanding of dhcp (ipv4 and ipv6). Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
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?
Quick Answer
The answer is that the DHCP server has detected two IP address conflicts on the network. This output from the show ip dhcp conflict command reveals that the router identified 192.168.1.50 via a ping check and 192.168.1.75 via a gratuitous ARP, meaning both addresses were already in use by another device when the server attempted to lease them. The DHCPv4 conflict detection feature automatically removes these conflicting addresses from the available pool, preventing duplicate IP assignments until an administrator manually clears them. On the Cisco CCNP ENARSI 300-410 exam, this command tests your understanding of how the router verifies address uniqueness before leasing, often appearing in troubleshooting scenarios where clients fail to obtain an IP. A common trap is assuming the conflicts are active problems rather than historical logs, but the detection time shows when the conflict was discovered, not when it was resolved. Memory tip: think of the two detection methods as “ping probes the network, ARP asks the local host”—both ensure no two devices share the same address.
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.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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
Two IP addresses are listed with detection methods and times, indicating conflicts.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The DHCP server has successfully assigned IP addresses 192.168.1.50 and 192.168.1.75.
Why it's wrong here
These addresses are in conflict, meaning they were not assigned due to detection of another device using them.
- ✗
The DHCP server uses only ping to detect conflicts.
Why it's wrong here
Both ping and gratuitous ARP are shown as detection methods.
- ✗
The DHCP server has cleared all conflicts from the database.
Why it's wrong here
The output shows two conflicts, so they have not been cleared.
Common exam traps
Common exam trap: answer the scenario, not the keyword
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.
Trap categories for this question
Command / output trap
Both ping and gratuitous ARP are shown as detection methods.
Detailed technical explanation
How to think about this question
Cisco DHCP servers perform conflict detection by sending a ping (ICMP echo) to the candidate address before offering it, and by sending a gratuitous ARP after the lease is assigned to verify no host responds. If a response is received, the address is marked as conflicting and logged with the detection method and timestamp. This prevents duplicate IP assignments, which is critical in networks with statically configured devices or rogue DHCP servers.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the 300-410 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
Visual reference
What to study next
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FAQ
Questions learners often ask
What does this 300-410 question test?
DHCP (IPv4 and IPv6) — This question tests DHCP (IPv4 and IPv6) — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: 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.
What should I do if I get this 300-410 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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