You have set a firewall rule that will permit inbound connections to a VM instance named whizserver-2. You want to apply this rule only if there is not another rule that would deny that traffic. What

A priority of 1000 is a relatively high priority, meaning it would override many other rules, which is not the goal if the rule should only apply if no deny rule exists.

A priority of 1 is a very high priority, second only to 0, meaning it would almost always take precedence, which contradicts the requirement.

In Google Cloud firewall rules, priority is an integer from 0 to 65535, where 0 is the highest priority and 65535 is the lowest. By giving the permit rule a priority of 65535, it will only be evaluated and applied if no other higher-priority (lower number) firewall rules, including implicit or explicit deny rules, match the traffic.

A priority of 0 is the highest possible priority, ensuring the rule takes precedence over all other rules, which is contrary to the requirement of applying only if no deny rule exists.