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Google Cloud Certified Professional Cloud Network Engineer · Google Cloud
Select one answer.
Written by other learners. Comments can disagree with the marked answer — check the official documentation when in doubt.
The correct answer is C. Since the external resource initiates communication and the issue is with the application hosted on the virtual machine, the most likely cause is that the ingress firewall rule is not allowing the incoming traffic from the external resource to reach the VM.
The external resource initiates communication so the traffic is ingress.
C is the answer. I thought it might be D but there are two statements that indicate EGRESS is working. The final statement says that external resource initiates communication but does not say whether the communication is successful. That final statement plus the two that talk about communicating outside the subnet clearly points to an INGRESS problem.