ANS-C01 Exam Dumps : Amazon AWS Certified Advanced Networking - Specialty

Using a Prefix List for Route Management: Acustomer-managed prefix listallows you to group multiple CIDR ranges into a single logical entity. By referencing the prefix list in VPC route tables, you can simplify route management. This eliminates the need to manually add individual CIDR ranges to each VPC route table.

Operational Efficiency: When a new VPC is added, its CIDR range can be added to the prefix list, and all route tables referencing the prefix list will automatically include the new CIDR. This reduces operational overhead compared to manually updating each route table.

Flexibility: The prefix list approach is highly scalable and supports the company’s need to add many new VPCs in the future.

To connect to multiple VPCs across different Regions using Direct Connect, the best option is to use a Direct Connect gateway and transit gateways. A Direct Connect gateway allows you to associate multiple virtual private gateways and transit gateways with the same Direct Connect connection. A transit gateway acts as a network hub that connects multiple VPCs and on-premises networks. By creating inter-Region peering connections between the transit gateways, you can enable cross-Region communication. Therefore, the steps are:

•Create four virtual private gateways and attach them to the four VPCs that need access from the on-premises location.

•Create a Direct Connect gateway and associate it with the four virtual private gateways.

•Create four transit VIFs on each Direct Connect connection and associate them with the Direct Connect gateway. A transit VIF allows you to connect to a Direct Connect gateway using a private ASN.

•Create an association between the Direct Connect gateway and the transit gateways in each Region. This will enable the on-premises location to access the VPCs that are attached to the transit gateways.

During creation of the Auto Scaling group, select subnets for the primary network interface. Use the user data option to run a cloud-init script to allocate a second network interface and to associate an Elastic IP address from the BYOIP pool.

This solution meets all of the requirements stated in the question. The primary network interface can be configured in a private subnet during creation of the Auto Scaling group. The user data option can be used to run a cloud-init script that will allocate a second network interface and associate an Elastic IP address from the BYOIP pool with it.