CompTIA
CV0-003 · Question #248
CV0-003 Question #248: Real Exam Question with Answer & Explanation
The correct answer is A: Incorrect subnet. This question tests network troubleshooting for a VM that communicates locally but fails to reach hosts on other networks, requiring identification of the root misconfiguration.
Troubleshooting
Question
A cloud implementation engineer successfully created a new VM. However, the engineer notices the new VM is not accessible from another network. A ping test works from another VM on the same subnet. Which of the following is the MOST likely problem?
Options
- AIncorrect subnet
- BIncorrect host IP address
- CIncorrect VLAN
- DIncorrect gateway
Explanation
This question tests network troubleshooting for a VM that communicates locally but fails to reach hosts on other networks, requiring identification of the root misconfiguration.
Common mistakes.
- B. An incorrect host IP address would typically cause broad connectivity failures including same-subnet pings, not a selective pattern where local communication succeeds but remote networks are unreachable.
- C. An incorrect VLAN assignment would isolate the VM from all other hosts, including those on the same subnet, so same-subnet ping success rules out a VLAN mismatch as the primary cause.
- D. An incorrect gateway would prevent cross-network traffic routing, but the gateway setting is only relevant after the subnet configuration is verified; a subnet error is more fundamental and would produce the same symptom pattern.
Concept tested. VM subnet misconfiguration causing cross-network connectivity failure
Reference. https://learn.microsoft.com/en-us/azure/virtual-network/virtual-network-vnet-plan-design-arm
Topics
#VM networking#subnet configuration#default gateway#network troubleshooting
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