Multi-VPC jumpbox architecture using AWS Transit Gateway, Network Firewall, and Client VPN to provide secure RDP/SSH access across production, test, and lab environments. Remote users authenticate via Route 53 DNS and Client VPN, traverse Network Firewall inspection, then route through a central t3.micro jumpbox in the Hub VPC before reaching isolated EC2 instances in three separate VPCs. IAM access control, Secrets Manager credential storage, and CloudWatch monitoring enforce least-privilege access and audit trails across all three environments. Fork this diagram on Diagrams.so to customize CIDR ranges, add additional VPCs, or integrate with your existing security group policies. This pattern demonstrates hub-and-spoke topology best practices for regulated workloads requiring centralized egress inspection and bastion-mediated access.