High-level Network Load Balancer builder following AWS best practices. **Default Security Settings:** - Internet-facing = false (internal by default for security) - Cross-zone load balancing = enabled (for high availability) - Deletion protection = false (opt-in for production) - IP address type = IPv4 **Rationale:** These defaults follow AWS Well-Architected Framework: - Internal by default prevents accidental public exposure - Cross-zone balancing improves availability and fault tolerance - IPv4 provides broadest compatibility **Escape Hatch:** Access the underlying CDK NetworkLoadBalancer via the `LoadBalancer` property for advanced scenarios not covered by this builder.