Google Professional Cloud Network Engineer Question 722
Select 3Google Cloud PlatformYour company has deployed a Cloud VPN tunnel to connect your on-premises data center to your VPC network in Google Cloud. Recently, users have reported intermittent connectivity issues when accessing applications hosted in the VPC. You want to identify the root cause of the issue using Google Cloud monitoring tools. Which monitoring metric(s) would be most relevant to investigate in this situation?
- A
Tunnel Transmitted Packets and Tunnel Received Packets metrics
- B
BGP Session State metric from Cloud Router
- C
VM Instance CPU Utilization metric
- D
VLAN Attachment Throughput metric
- E
Tunnel Establishment Failure Count metric
Show answer and explanation
Correct answers: A, B, E
Explanation
To diagnose connectivity issues with Cloud VPN, you need to monitor metrics that provide insight into the tunnel's performance and status. Tunnel Transmitted Packets and Tunnel Received Packets help analyze the traffic flow, while the BGP Session State metric ensures the routing connection is active. Additionally, the Tunnel Establishment Failure Count metric helps identify any issues with the tunnel's stability. Monitoring these metrics collectively can help pinpoint the root cause of the problem.
- A. Correct.
Correct. Tunnel Transmitted Packets and Tunnel Received Packets metrics help monitor the traffic flowing through the VPN tunnel, allowing you to identify potential packet loss or anomalies in data transmission.
- B. Correct.
Correct. The BGP Session State metric from Cloud Router indicates whether the BGP peering session between your on-premises router and Cloud Router is active. Issues with BGP peering can lead to connectivity problems.
- C. Incorrect.
Incorrect. While VM Instance CPU Utilization metric is useful for monitoring the performance of individual VMs, it does not directly relate to diagnosing connectivity issues with the VPN tunnel.
- D. Incorrect.
Incorrect. VLAN Attachment Throughput metric is specific to Cloud Interconnect and does not apply to Cloud VPN tunnels.
- E. Correct.
Correct. The Tunnel Establishment Failure Count metric indicates if there are issues with establishing or maintaining the VPN tunnel, which is critical when troubleshooting intermittent connectivity problems.