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CV0-002 · Question #248

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. Wh

The correct answer is D. Incorrect gateway. If a VM can communicate within its own subnet but not with other networks, the most likely issue is an incorrect or missing default gateway configuration.

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

How the community answered

(18 responses)
  • A
    6% (1)
  • B
    11% (2)
  • D
    83% (15)

Why each option

If a VM can communicate within its own subnet but not with other networks, the most likely issue is an incorrect or missing default gateway configuration.

AIncorrect subnet

An incorrect subnet would typically prevent communication even within the same logical subnet, which contradicts the successful ping test to another VM on the same subnet.

BIncorrect host IP address

An incorrect host IP address might cause general connectivity issues, but if local subnet communication works, the IP is at least correctly associated with the local subnet.

CIncorrect VLAN

An incorrect VLAN configuration would typically prevent the VM from communicating with any other VMs, even on the "same subnet" if the VLAN tagging is wrong, which contradicts the successful ping test within the subnet.

DIncorrect gatewayCorrect

The default gateway is responsible for routing traffic from the local subnet to other networks. If a VM can communicate locally but not externally, it implies the gateway is misconfigured or missing, preventing it from knowing where to send traffic for other networks.

Concept tested: Network connectivity troubleshooting

Source: https://learn.microsoft.com/en-us/troubleshoot/azure/virtual-network/troubleshoot-vm-connectivity

Topics

#VM networking#Network troubleshooting#Incorrect gateway#Inter-network communication

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