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Question 197 - Professional Cloud Network Engineer discussion

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Your company's current network architecture has two VPCs that are connected by a dual-NIC instance that acts as a bump-in-the-wire firewall between the two VPCs. Flows between pairs of subnets across the two VPCs are working correctly. Suddenly, you receive an alert that none of the flows between the two VPCs are working anymore. You need to troubleshoot the problem. What should you do? (Choose 2 answers)

A.

Verify that the dual-NIC instance has not been added to a backend service.

Answers
A.

Verify that the dual-NIC instance has not been added to a backend service.

B.

Verify that a public IP address has not been assigned to any network interface of the dual-NIC instance.

Answers
B.

Verify that a public IP address has not been assigned to any network interface of the dual-NIC instance.

C.

Use Cloud Logging to verify that there were no modifications to the VPC firewall rules or policies that were applied to the two network interfaces of the dual-NIC instance.

Answers
C.

Use Cloud Logging to verify that there were no modifications to the VPC firewall rules or policies that were applied to the two network interfaces of the dual-NIC instance.

D.

Verify that a VPC Service Controls perimeter has not been enabled for the project that contains the two VPCs and the dual-NIC instance.

Answers
D.

Verify that a VPC Service Controls perimeter has not been enabled for the project that contains the two VPCs and the dual-NIC instance.

E.

Verify that the dual-NIC instance has the --can-ip-forward attribute enabled.

Answers
E.

Verify that the dual-NIC instance has the --can-ip-forward attribute enabled.

Suggested answer: C, E

Explanation:

You should check Cloud Logging to see if any firewall rules or policies were modified, as these could block traffic between the VPCs. Additionally, the --can-ip-forward attribute must be enabled for the dual-NIC instance to allow forwarding traffic between the interfaces.

asked 29/10/2024
Umesh Hirji
28 questions
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