ANS-C01 · Question #292
A company uses transit gateways to route traffic between the company's VPCs. Each transit gateway has a single route table. Each route table contains attachments and routes for the VPCs that are in…
The correct answer is A. Create a new customer-managed prefix list. Add all VPC CIDR ranges to the new prefix list. Using a Prefix List for Route Management: A customer-managed prefix list allows 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…
Question
A company uses transit gateways to route traffic between the company's VPCs. Each transit gateway has a single route table. Each route table contains attachments and routes for the VPCs that are in the same AWS Region as the transit gateway. The route tables in each VPC also contain routes to all the other VPC CIDR ranges that are available through the transit gateways. Some VPCs route to local NAT gateways. The company plans to add many new VPCs soon. A network engineer needs a solution to add new VPC CIDR ranges to the route tables in each VPC. Which solution will meet these requirements in the MOST operationally efficient way?
Options
- ACreate a new customer-managed prefix list. Add all VPC CIDR ranges to the new prefix list.
- BTurn on default route table propagation for the transit gateway route tables. Turn on route
- CUpdate the route tables in each VPC to use 0.0.0.010 as the destination and the appropriate
- DTurn on default route table association for the transit gateway route tables. Turn on route
How the community answered
(24 responses)- A83% (20)
- B8% (2)
- C4% (1)
- D4% (1)
Explanation
Using a Prefix List for Route Management: A customer-managed prefix list allows 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.
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