AWS Certified Advanced Networking – Specialty (ANS-C01) — Question 168

A network engineer needs to improve the network security of an existing AWS environment by adding an AWS Network Firewall firewall to control internet-bound traffic. The AWS environment consists of five VPCs. Each VPC has an internet gateway, NAT gateways, public Application Load Balancers (ALBs), and Amazon EC2 instances. The EC2 instances are deployed in private subnets. The architecture is deployed across two Availability Zones.

The network engineer must be able to configure rules for the public IP addresses in the environment, regardless of the direction of traffic. The network engineer must add the firewall by implementing a solution that minimizes changes to the existing production environment. The solution also must ensure high availability.

Which combination of steps should the network engineer take to meet these requirements? (Choose two.)

Answer options

• A. Create a centralized inspection VPC with subnets in two Availability Zones. Deploy Network Firewall in this inspection VPC with an endpoint in each Availability Zone.
• B. Configure new subnets in two Availability Zones in each VPC. Deploy Network Firewall in each VPC with an endpoint in each Availability Zone.
• C. Deploy Network Firewall in each VPUse existing subnets in each of the two Availability Zones to deploy Network Firewall endpoints.
• D. Update the route tables that are associated with the private subnets that host the EC2 instances. Add routes to the Network Firewall endpoints.
• E. Update the route tables that are associated with the public subnets that host the NAT gateways and the ALBs. Add routes to the Network Firewall endpoints.

Correct answer: B, E

Explanation

The correct answer is B and E because creating new subnets in each VPC allows for proper deployment of the Network Firewall while ensuring high availability across the two Availability Zones. Updating the public route tables ensures that traffic flows through the firewall, safeguarding the entire architecture. Options A, C, and D do not meet all requirements, such as minimizing changes or providing high availability across existing VPCs.