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Question 204 - Professional Cloud Network Engineer discussion

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You are troubleshooting an application in your organization's Google Cloud network that is not functioning as expected. You suspect that packets are getting lost somewhere. The application sends packets intermittently at a low volume from a Compute Engine VM to a destination on your on-premises network through a pair of Cloud Interconnect VLAN attachments. You validated that the Cloud Next Generation Firewall (Cloud NGFW) rules do not have any deny statements blocking egress traffic, and you do not have any explicit allow rules. Following Google-recommended practices, you need to analyze the flow to see if packets are being sent correctly out of the VM to isolate the issue. What should you do?

A.

Create a packet mirroring policy that is configured with your VM as the source and destined to a collector. Analyze the packet captures.

Answers
A.

Create a packet mirroring policy that is configured with your VM as the source and destined to a collector. Analyze the packet captures.

B.

Enable VPC Flow Logs on the subnet that the VM is deployed in with sample_rate = 1.0, and run a query in Logs Explorer to analyze the packet flow.

Answers
B.

Enable VPC Flow Logs on the subnet that the VM is deployed in with sample_rate = 1.0, and run a query in Logs Explorer to analyze the packet flow.

C.

Enable Firewall Rules Logging on your firewall rules and review the logs.

Answers
C.

Enable Firewall Rules Logging on your firewall rules and review the logs.

D.

Verify the network/attachment/egress_dropped_packet.s_count Cloud Interconnect VLAN attachment metric.

Answers
D.

Verify the network/attachment/egress_dropped_packet.s_count Cloud Interconnect VLAN attachment metric.

Suggested answer: B

Explanation:

Enabling VPC Flow Logs with sample_rate = 1.0 on the VM's subnet will give detailed information about network traffic flowing to and from your VM. You can then query this data in Logs Explorer to check whether packets are leaving the VM and reaching the intended destination. This is a recommended practice for troubleshooting such network issues.

asked 29/10/2024
Pilocz Pi
39 questions
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