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AWS Certified Solutions Architect - Professional · AWS
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It uses a centralized egress VPC with AWS Network Firewall (managed, horizontally scalable) and a NAT Gateway, attached to the existing Transit Gateway. All spoke VPCs route outbound through the firewall for org‑wide, rule‑based filtering. This meets the ≤25 Gbps/AZ load, minimizes operational overhead, and avoids the cost/complexity of running EC2 proxy fleets (A, D) or duplicating firewalls in 100+ accounts (C).
Centrally managed egress, so C/D are out. Both A and B are wrong, because 1. There isn’t internet gateway. 2. “Modify all default routes to point to the …”. A firewall or “proxy's Auto Scaling group” don’t have public IP, the default route must be pointing to the NAT gateway. And NAT gateway has a peer public IP configured on the IGW. The route should be: internet prefix of all the internal subnet-> NAT gateway -> firewall -> internet gateway, and reverse routing rules are also required. . Well, considering the persistent low quality of AWS Exam Questions, I vote B
c,d in each AWS account. wrong a: use third party solution, not as good as b (use aws service)