AWS Certified Solutions Architect - Professional

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Explanation:

Explanation for Answer A: Creating a VPC Endpoint Service that accepts TCP traffic and hosting it behind a Network Load Balancer, while making the service available over AWS Direct Connect (DX), is the most suitable solution for the company's requirements. This approach ensures that the sensitive service data does not traverse the internet, as the connectivity is established directly between the on-premises data center and AWS through DX. The VPC Endpoint Service allows the company to offer its services to other AWS customers securely and privately. A Network Load Balancer is appropriate here because it can handle high volumes of traffic and is optimized for TCP traffic, which is often used for sensitive data transfer.
Explanation for other options:

B: This option is not suitable because HTTP or HTTPS traffic is typically used for web applications and not for sensitive data transfer. Moreover, an Application Load Balancer is designed for HTTP/HTTPS traffic and may not be the best fit for TCP traffic.
C: Attaching an internet gateway to the VPC would allow the traffic to traverse the internet, which is against the company's requirement of not allowing connectivity to go over the internet.
D: Attaching a NAT gateway to the VPC would also allow the traffic to traverse the internet, as NAT gateways are used to provide outbound internet access to instances in a private subnet. This does not meet the requirement of keeping the connectivity private and secure.

Explanation:

Explanation for Answer A: Creating a VPC Endpoint Service that accepts TCP traffic and hosting it behind a Network Load Balancer, while making the service available over AWS Direct Connect (DX), is the most suitable solution for the company's requirements. This approach ensures that the sensitive service data does not traverse the internet, as the connectivity is established directly between the on-premises data center and AWS through DX. The VPC Endpoint Service allows the company to offer its services to other AWS customers securely and privately. A Network Load Balancer is appropriate here because it can handle high volumes of traffic and is optimized for TCP traffic, which is often used for sensitive data transfer.
Explanation for other options:

B: This option is not suitable because HTTP or HTTPS traffic is typically used for web applications and not for sensitive data transfer. Moreover, an Application Load Balancer is designed for HTTP/HTTPS traffic and may not be the best fit for TCP traffic.
C: Attaching an internet gateway to the VPC would allow the traffic to traverse the internet, which is against the company's requirement of not allowing connectivity to go over the internet.
D: Attaching a NAT gateway to the VPC would also allow the traffic to traverse the internet, as NAT gateways are used to provide outbound internet access to instances in a private subnet. This does not meet the requirement of keeping the connectivity private and secure.

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Create a VPC Endpoint Service that accepts TCP traffic host it behind a Network Load Balancer and make the service available over DX

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Create a VPC Endpoint Service that accepts HTTP or HTTPS traffic host It behind an Application Load Balancer and make the service available over DX

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Attach an internet gateway to the VPC，and ensure that network access control and security group rules allow the relevant inbound and outbound traffic

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Attach a NAT gateway to the VPC and ensure that network access control and security group rules allow the relevant inbound and outbound traffic

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