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AWS Certified Solutions Architect - Professional · AWS
Select one answer.
Written by other learners. Comments can disagree with the marked answer — check the official documentation when in doubt.
MOST cost-effectively, so C
AWS Managed AD total costs = standard AWS managed ad per month ~100USD + 2 EC2 (2xDC on your VPC) ~160USD = ~300 USD VPN total costs ~ (0.05 USD per hour) =~40USD per month so VPN is most cost effective solution ----- answer is C
C. Site-to-Site VPN + domain join to on-prem AD + RDP over VPN This uses the company’s hardware (already available), so VPN cost is minimal (just AWS VPN hourly + data transfer). You domain join the EC2 instances directly to the on-prem AD. You RDP over VPN → no need to expose ports publicly. Very cost-effective (just VPN connection + normal EC2). Verdict: ✅ Also secure and cheap — but requires that users connect from the corporate network, not from anywhere on the internet unless VPN client is deployed. The question says "connectivity to the VPC is through the internet", so this fits if VPN is used.