Google Cloud Professional Cloud Network Engineer — Question 187

You have provisioned a Cloud Interconnect connection with a VLAN attachment. You configured Border Gateway Protocol (BGP) between your on-premises router and your Cloud Router. After deploying and testing the connection, you discover that the BGP session is not established between your on-premises router and the Cloud Router. Which two actions should you take to resolve this issue? (Choose two.)

Answer options

• A. From the Google Cloud console, run gcloud compute routers get-statusto verify the Address Resolution Protocol (ARP) learned.
• B. Verify that you have configured the on-premises router's subinterface with a subnet mask of /31.
• C. Verify that you have configured the on-premises router's eBGP multihop with a minimum hop length of 4.
• D. Verify that you have configured the on-premises router's BGP security parameters to use MD5 authentication.
• E. From the Google Cloud console, run gcloud compute interconnects get-diagnosticsto verify the Address Resolution Protocol (ARP) learned.

Correct answer: A, E

Explanation

Option A is correct because verifying the ARP learned through the Cloud Router can help troubleshoot connectivity issues. Option E is also correct as it allows you to check diagnostics on the interconnect, which can provide insights into the ARP status. Options B, C, and D are not directly related to the BGP session establishment issue in this context.