network-engineer video for your organization has a strict security requirement to block all incoming SMTP traffic (TCP port 25) to your Google Cloud
Your organization has a strict security requirement to block all incoming SMTP traffic (TCP port 25) to your Google Cloud environment, except for SMTP traffic originating from your corporate network . Furthermore, only selected VPCs across various projects should allow SMTP traffic from the corporate network. You are responsible for implementing a hierarchical firewall policy that enforces this behavior consistently. What steps should you take to meet this requirement?