Exam Professional Data Engineer topic 1 question 307 discussion

- Using the Cloud SQL Auth proxy is a recommended method for secure connections, especially when dealing with dynamic IP addresses. - The Auth proxy provides secure access to your Cloud SQL instance without the need for Authorized Networks or managing IP addresses. - It works by encapsulating database traffic and forwarding it through a secure tunnel, using Google's IAM for authentication. - Leaving the Authorized Networks empty means you're not allowing any direct connections based on IP addresses, relying entirely on the Auth proxy for secure connectivity. This is a secure and flexible solution, especially for applications with dynamic IPs.

Option C

The Cloud SQL Auth Proxy is a Cloud SQL connector that provides secure access to your instances without a need for Authorized networks or for configuring SSL. https://cloud.google.com/sql/docs/mysql/sql-proxy

always use Cloud SQL Auth proxy if possible

https://stackoverflow.com/questions/27759356/how-to-authorize-my-dynamic-ip-network-address-in-google-cloud-sql https://stackoverflow.com/questions/24749810/how-to-make-a-google-cloud-sql-instance-accessible-for-any-ip-address

As for me, after reading documentation, option D looks appropriate

C. Leave the Authorized Network empty. Use Cloud SQL Auth proxy on all applications.