SOA-C02 Question 287
Select 4Your organization has a hybrid infrastructure setup with an AWS Direct Connect connection. Users are reporting intermittent connectivity issues when accessing applications hosted in your VPC. You suspect the issue may be related to the Border Gateway Protocol (BGP) configuration. Which of the following troubleshooting steps should you take to identify and resolve the issue?
- A
Verify that the BGP session between your on-premises router and the AWS Direct Connect router is in an 'Established' state.
- B
Check if the advertised routes from your on-premises router match the CIDR blocks defined in your VPC route table.
- C
Ensure that the Direct Connect connection is configured for Multi-AZ redundancy.
- D
Verify that the AWS Direct Connect Virtual Interface (VIF) is in an 'Available' state.
- E
Review CloudWatch metrics for the Direct Connect Virtual Interface to identify any packet loss or latency issues.
Show answer and explanation
Correct answers: A, B, D, E
Explanation
Intermittent connectivity issues in a hybrid setup using AWS Direct Connect can arise from several factors, including BGP session status, route mismatches, or network performance problems. Verifying the BGP session state, checking route configurations, ensuring the VIF is available, and reviewing CloudWatch metrics are essential steps to identify and resolve such issues. Multi-AZ redundancy, while important for high availability, does not directly address the specific problem described in this scenario.
- A. Correct.
Verifying that the BGP session is in an 'Established' state is a critical troubleshooting step, as BGP is required for route exchange between the on-premises and AWS environments. If the session is not established, connectivity issues will occur.
- B. Correct.
Checking if the advertised routes from your on-premises network match the VPC route table ensures that traffic is routed correctly. Mismatched or missing routes can cause connectivity problems.
- C. Incorrect.
While Multi-AZ redundancy is a best practice for high availability, it is not directly related to resolving the intermittent connectivity issue in this scenario.
- D. Correct.
Verifying the state of the Virtual Interface (VIF) ensures that the Direct Connect configuration is active and available for use. If the VIF is down, connectivity issues will occur.
- E. Correct.
Reviewing CloudWatch metrics for the Direct Connect VIF can help identify network performance issues such as packet loss or latency, which can cause intermittent connectivity problems.