What is a good use case for deny rules?

Deny rules are primarily utilized to restrict or block specific types of traffic that may pose a risk or violate security policies. In the case of development and production environments, the potential risk of unauthorized access or unintended interference is significant. Therefore, employing a deny rule specifically to prevent communication between these environments serves as a critical security measure.

When development and production environments are isolated from each other, it helps to mitigate potential issues such as accidental changes to production systems, exposure of sensitive data, or the introduction of unstable code from development. This practice supports the principle of least privilege, ensuring that access to production resources is strictly controlled and only permitted for necessary roles.

While the other choices might address different aspects of network configuration or security policy, they do not highlight the specific importance of using deny rules to safeguard the integrity and security of critical production systems in relation to potentially less stable development environments.