The answer is a disabled network interface on the destination VM. This is correct because a disabled NIC prevents Layer 2 operations like ARP resolution and frame delivery, so even though both VMs reside on the same subnet, the source VM cannot resolve the destination’s MAC address or send frames to it. Ping and traceroute will fail with no response, as the network stack on the destination never receives or processes the traffic. On the CompTIA Cloud+ CV0-004 exam, this scenario tests your ability to distinguish between Layer 2 issues and higher-layer problems like security groups or routing misconfigurations—a common trap is assuming a powered-on VM means its network interface is active. Remember the key symptom: same-subnet connectivity loss with no packet loss or timeouts on intermediate hops points directly to a disabled NIC. Memory tip: “No MAC, no stack—check the NIC before you check the rack.”
CV0-004 Troubleshooting Practice Question
This CV0-004 practice question tests your understanding of troubleshooting. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
Exhibit
Refer to the exhibit.
```
$ ping 10.10.10.10
PING 10.10.10.10 (10.10.10.10) 56(84) bytes of data.
From 10.10.10.1 icmp_seq=1 Destination Host Unreachable
From 10.10.10.1 icmp_seq=2 Destination Host Unreachable
From 10.10.10.1 icmp_seq=3 Destination Host Unreachable
--- 10.10.10.10 ping statistics ---
3 packets transmitted, 0 received, +3 errors, 100% packet loss, time 2003ms
$ traceroute 10.10.10.10
traceroute to 10.10.10.10 (10.10.10.10), 30 hops max, 60 byte packets
1 10.10.10.1 0.433 ms 0.428 ms 0.414 ms
2 * * *
3 * * *
4 * * *
```
A cloud administrator is troubleshooting connectivity to a virtual machine with IP address 10.10.10.10 from another VM on the same subnet. The output of ping and traceroute commands is shown. What is the most likely cause of the connectivity issue?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Refer to the exhibit.
```
$ ping 10.10.10.10
PING 10.10.10.10 (10.10.10.10) 56(84) bytes of data.
From 10.10.10.1 icmp_seq=1 Destination Host Unreachable
From 10.10.10.1 icmp_seq=2 Destination Host Unreachable
From 10.10.10.1 icmp_seq=3 Destination Host Unreachable
--- 10.10.10.10 ping statistics ---
3 packets transmitted, 0 received, +3 errors, 100% packet loss, time 2003ms
$ traceroute 10.10.10.10
traceroute to 10.10.10.10 (10.10.10.10), 30 hops max, 60 byte packets
1 10.10.10.1 0.433 ms 0.428 ms 0.414 ms
2 * * *
3 * * *
4 * * *
```
A
The destination VM's network interface is disabled.
If the network interface is disabled, the VM will not respond to ARP requests, causing the gateway to return 'Destination Host Unreachable'.
B
The destination VM is powered off.
Why wrong: While a powered-off VM could cause unreachability, the 'Destination Host Unreachable' message from the gateway suggests the gateway itself cannot resolve the destination MAC, which is more indicative of an ARP failure than a powered-off VM.
C
The source VM's routing table does not have a default gateway.
Why wrong: Since both VMs are on the same subnet, no routing is needed; the issue is at layer 2, not layer 3 routing.
D
The destination VM's security group is blocking ICMP.
Why wrong: A security group blocking ICMP would typically result in a timeout (no response) rather than a 'Destination Host Unreachable' message from the gateway.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The destination VM's network interface is disabled.
The correct answer is A because a disabled network interface on the destination VM would cause the VM to be unreachable from the same subnet, even though the VM itself is powered on. Ping and traceroute would fail with no response, as the NIC is not operational at Layer 2, preventing ARP resolution and frame delivery. This matches the symptom of no connectivity despite being on the same subnet, where routing and security groups are not factors.
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 destination VM's network interface is disabled.
Why this is correct
If the network interface is disabled, the VM will not respond to ARP requests, causing the gateway to return 'Destination Host Unreachable'.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The destination VM is powered off.
Why it's wrong here
While a powered-off VM could cause unreachability, the 'Destination Host Unreachable' message from the gateway suggests the gateway itself cannot resolve the destination MAC, which is more indicative of an ARP failure than a powered-off VM.
✗
The source VM's routing table does not have a default gateway.
Why it's wrong here
Since both VMs are on the same subnet, no routing is needed; the issue is at layer 2, not layer 3 routing.
✗
The destination VM's security group is blocking ICMP.
Why it's wrong here
A security group blocking ICMP would typically result in a timeout (no response) rather than a 'Destination Host Unreachable' message from the gateway.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume a powered-off VM is the cause, but the question specifies the VM is on the same subnet and the output shows no response at all, which points to a Layer 2 issue (disabled NIC) rather than a Layer 3 or higher issue like security groups or routing.
Detailed technical explanation
How to think about this question
When a VM's network interface is disabled in the guest OS (e.g., via ifconfig down or disabling the adapter in Windows), the NIC does not respond to ARP requests, so the source VM cannot resolve the destination MAC address, causing all Layer 3 traffic to fail. This is distinct from the VM being powered off, where the hypervisor may still respond to ARP on behalf of the VM in some configurations (e.g., with virtual switch spoofing protection). In cloud environments like AWS or Azure, a disabled NIC in the guest OS is a common misconfiguration that mimics a network outage but is easily overlooked.
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 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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Troubleshooting — This question tests Troubleshooting — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The destination VM's network interface is disabled. — The correct answer is A because a disabled network interface on the destination VM would cause the VM to be unreachable from the same subnet, even though the VM itself is powered on. Ping and traceroute would fail with no response, as the NIC is not operational at Layer 2, preventing ARP resolution and frame delivery. This matches the symptom of no connectivity despite being on the same subnet, where routing and security groups are not factors.
What should I do if I get this CV0-004 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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