CV0-004 Troubleshooting Practice Question
Exhibit
Refer to the exhibit. ``` $ ping 10.0.1.10 PING 10.0.1.10 (10.0.1.10) 56(84) bytes of data. From 10.0.0.1 icmp_seq=1 Destination Host Unreachable From 10.0.0.1 icmp_seq=2 Destination Host Unreachable ```
A cloud technician is troubleshooting connectivity from a VM with IP 10.0.0.1 to another VM at 10.0.1.10 in a different subnet. The ping output shows 'Destination Host Unreachable'. Which of the following is the most likely cause?
⚠ Common exam trap
CompTIA often tests the distinction between 'Destination Host Unreachable' (Layer 3 routing failure) and 'Request Timed Out' (Layer 4 or firewall blocking), tricking candidates into blaming ARP or firewalls when the real issue is a missing route on the gateway.
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 source's default gateway does not have a route to the destination network
The 'Destination Host Unreachable' error indicates that the source VM (10.0.0.1) cannot find a path to the destination subnet (10.0.1.0/24). Since the VMs are in different subnets, the source must send traffic to its default gateway. If that gateway lacks a route to 10.0.1.0/24, it will drop the packet and send an ICMP Destination Unreachable message back, causing the observed error. This is the most likely cause because the issue is at Layer 3 routing, not Layer 2 ARP or local interface problems.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
ARP resolution for the destination IP is failing
Why it's wrong here
ARP failure would occur on the source if the destination were on the same subnet; here they are on different subnets.
- ✗
The network interface on the source VM is disabled
Why it's wrong here
If the NIC were disabled, the ping command would fail with a local error.
- ✗
A firewall is blocking ICMP on the destination
Why it's wrong here
A firewall block would cause no response or 'Request timed out', not 'Destination Host Unreachable'.
- ✓
The source's default gateway does not have a route to the destination network
Why this is correct
The gateway (10.0.0.1) sends 'Destination Host Unreachable' when it has no route to the destination.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This CV0-004 practice question is part of Courseiva's free CompTIA 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 CV0-004 exam.