Exam Professional Data Engineer topic 1 question 212 discussion

The best approach would be to check if there is a firewall rule allowing traffic on TCP ports 12345 and 12346 for the Dataflow network tag. Dataflow uses TCP ports 12345 and 12346 for communication between worker nodes. Using network tags and associated firewall rules is a Google-recommended security practice for controlling access between Compute Engine instances like Dataflow workers. So the key things to check would be: 1. Ensure your Dataflow pipeline is using the Dataflow network tag on the worker nodes. This tag is applied by default unless overridden. 2. Check if there is a firewall rule allowing TCP 12345 and 12346 ingress and egress traffic for instances with the Dataflow network tag. If not, add the rule. Options A, C and D relate to other networking aspects but do not directly address the Google recommended practice of using network tags and firewall rules.

B. Determine whether there is a firewall rule set to allow traffic on TCP ports 12345 and 12346 for the Dataflow network tag.

B, check if there is a firewall rule allowing traffic on TCP ports 12345 and 12346 for the Dataflow network tag.

Because network tags are used and Dataflow uses TCP ports 12345 and 12346 as stated on https://cloud.google.com/dataflow/docs/guides/routes-firewall

This option focuses directly on ensuring that the firewall rules are set up correctly for the network tags used by Dataflow worker nodes. It specifically addresses the potential issue of worker nodes not being able to communicate due to restrictive firewall rules blocking the necessary ports.

Focus on Network Tags: Adheres to the recommended practice of using network tags for firewall configuration, enhancing security and flexibility. Avoids targeting specific subnets, which can be less secure and harder to manage.