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Question 366 of 1,052
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CCNA Practice Question: Which TWO commands or tools would a network…
This 200-301 practice question tests your understanding of 200-301 exam topics. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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.
Which TWO commands or tools would a network engineer use to verify if a client has a duplicate IP address conflict on the local subnet?
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
✓
arp -a
A duplicate IP address occurs when two devices on the same subnet are configured with the same IP address. The 'arp -a' command displays the ARP cache, which can show multiple MAC addresses for the same IP, indicating a conflict. The 'ping' command can be used to check for duplicate IPs by pinging the client's IP from another device; if a response is received from a different MAC address than expected, a conflict exists. 'ipconfig /all' shows the client's own IP configuration but does not detect conflicts. 'nslookup' resolves names to IPs and is unrelated. 'tracert' traces the path to a destination and does not identify local IP conflicts.
Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
ipconfig /all
Why it's wrong here
This command displays the client's own IP configuration (IP address, subnet mask, default gateway, DNS servers, etc.) but does not detect or reveal duplicate IP conflicts on the network.
- ✓
arp -a
- ✗
nslookup
Why it's wrong here
This command is used to query DNS servers to resolve domain names to IP addresses or vice versa. It does not provide any information about IP address conflicts on the local subnet.
- ✓
ping
Why this is correct
By pinging the client's IP address from another device, you can verify if a response is received. If the ping succeeds and the MAC address in the ARP cache differs from the client's actual MAC, a duplicate IP conflict is likely.
Related concept
CIDR notation defines the prefix length.
- ✗
tracert
Why it's wrong here
This command traces the route packets take to a destination IP address, showing each hop. It is used for path troubleshooting and does not help in detecting local IP conflicts.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The 200-301 exam frequently reuses these exact scenarios with slightly different constraints.
✓arp -aCorrect answer▾
Why this is correct
This command displays the ARP cache, which maps IP addresses to MAC addresses. If a duplicate IP exists, the ARP cache may show two different MAC addresses for the same IP address, indicating a conflict.
✗ipconfig /allWrong answer — click to see why▾
Why this is wrong here
It only shows the local settings, not whether another device is using the same IP.
✗nslookupWrong answer — click to see why▾
Why this is wrong here
It is a DNS troubleshooting tool, not for detecting duplicate IPs.
✗tracertWrong answer — click to see why▾
Why this is wrong here
It focuses on the path to a remote host, not on local subnet issues.
Analysis generated from the official 200-301blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Common exam traps
Common exam trap: usable hosts are not the same as total addresses
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Trap categories for this question
Command / output trap
This command displays the client's own IP configuration (IP address, subnet mask, default gateway, DNS servers, etc.) but does not detect or reveal duplicate IP conflicts on the network.
Detailed technical explanation
How to think about this question
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
KKey Concepts to Remember
- CIDR notation defines the prefix length.
- Block size helps identify subnet boundaries.
- Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
- The required host count determines the smallest suitable subnet.
TExam Day Tips
- Write the block size before choosing the subnet.
- Check whether the question asks for hosts, subnets or a specific address range.
- Do not confuse /24, /25, /26 and /27 host counts.
Key takeaway
Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
Got this wrong? Here's your next step.
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related 200-301 subnetting questions on CIDR, address ranges, and subnet selection.
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FAQ
Questions learners often ask
What does this 200-301 question test?
CIDR notation defines the prefix length.
What is the correct answer to this question?
The correct answer is: arp -a — A duplicate IP address occurs when two devices on the same subnet are configured with the same IP address. The 'arp -a' command displays the ARP cache, which can show multiple MAC addresses for the same IP, indicating a conflict. The 'ping' command can be used to check for duplicate IPs by pinging the client's IP from another device; if a response is received from a different MAC address than expected, a conflict exists. 'ipconfig /all' shows the client's own IP configuration but does not detect conflicts. 'nslookup' resolves names to IPs and is unrelated. 'tracert' traces the path to a destination and does not identify local IP conflicts.
What should I do if I get this 200-301 question wrong?
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related 200-301 subnetting questions on CIDR, address ranges, and subnet selection.
What is the key concept behind this question?
CIDR notation defines the prefix length.
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