Design a system to deny services to requests from banned IPs, as per information provided by security.gov.x.

To block requests from banned IPs based on security.gov.x data, implement a multi-layered approach:

1. Real-time IP Validation: Integrate a service that checks incoming IP addresses against a dynamic ban list. This service should query the security.gov.x API or a cached version of its data.
2. Edge Network Filtering: Deploy a Web Application Firewall (WAF) or a similar edge security solution. Configure it to block IPs flagged by security.gov.x before they reach your application servers.
3. Application-Level Checks: As a fallback, implement checks within your application's request handling pipeline. This can involve a middleware that consults a local cache or directly queries the security.gov.x API.
4. Caching Strategy: To minimize latency and API call volume, cache the banned IP list locally. Implement a robust cache invalidation strategy to ensure the list remains up-to-date.
5. Monitoring and Alerting: Set up monitoring for WAF blocks, application-level rejections, and API query failures. Alert security teams to suspicious activity or system malfunctions.