Google Professional Cloud Network Engineer Question 742
Select 3Google Cloud PlatformYour organization has set up a VPN between an on-premises data center and a Google Cloud VPC network. Users are reporting intermittent connectivity issues. Upon investigation, you notice that some packets are being dropped, and the VPN tunnel status occasionally transitions to 'DOWN'. Which of the following actions should you take to identify and resolve the issue?
- A
Check the VPN tunnel's logs in Google Cloud to identify errors or warnings.
- B
Verify that the Cloud Router's BGP session is established and routes are being exchanged correctly.
- C
Recreate the VPN tunnel to reset the connection and resolve the issue.
- D
Ensure that both ends of the VPN tunnel have matching IKE (Internet Key Exchange) configurations.
- E
Increase the MTU (Maximum Transmission Unit) size on the VPN tunnel to improve packet throughput.
Show answer and explanation
Correct answers: A, B, D
Explanation
Intermittent connectivity issues in a VPN are commonly caused by configuration mismatches, routing problems, or dropped packets. By checking logs, verifying BGP sessions, and ensuring matching IKE configurations, you can systematically identify and resolve the root cause. Recreating the tunnel or adjusting MTU without understanding the problem may lead to unnecessary complications or new issues.
- A. Correct.
Checking the VPN tunnel logs in Google Cloud is a critical step for identifying the root cause of the issue. Logs can provide insights into errors, dropped packets, or misconfigurations.
- B. Correct.
Verifying that the BGP session is established is essential to ensure proper route exchange. If the BGP session is down, routing issues can cause connectivity problems.
- C. Incorrect.
Recreating the VPN tunnel is not a best practice for troubleshooting intermittent issues, as it does not address the root cause and may result in unnecessary downtime.
- D. Correct.
Ensuring matching IKE configurations on both ends is necessary for the VPN tunnel to function correctly. Mismatched configurations can cause the tunnel to intermittently disconnect.
- E. Incorrect.
Increasing the MTU size is not a recommended action for troubleshooting VPN connectivity issues. Instead, MTU size should be adjusted carefully based on network requirements and compatibility.