Topic 1 Question 262

AWS Certified Advanced Networking - Specialty

Topic 1 Question 262
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?
- Create a new customer-managed prefix list. Add all VPC CIDR ranges to the new prefix list. Update the route tables in each VPC to use the new prefix list ID as the destination and the appropriate transit gateway ID as the target.
- Turn on default route table propagation for the transit gateway route tables. Turn on route propagation for each route table in each VPC.
- Update the route tables in each VPC to use 0.0.0.010 as the destination and the appropriate transit gateway ID as the target.
- Turn on default route table association for the transit gateway route tables. Turn on route propagation for each route table in each VPC.
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- 正解だと思う選択肢: A
  A https://docs.aws.amazon.com/vpc/latest/tgw/create-prefix-list-reference.html
  
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  jfedotov2025/01/21
- 正解だと思う選択肢: A
  A. b -> won't work here c - > can break internet facing VPCs d -> also won't work
  
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  kowal_0012025/01/16
- answer is A Route propagation — A VPC, VPN connection, or Direct Connect gateway can dynamically propagate routes to a transit gateway route table. With a Connect attachment, the routes are propagated to a transit gateway route table by default. With a VPC, you must create static routes to send traffic to the transit gateway. With a VPN connection, routes are propagated from the transit gateway to your on-premises router using Border Gateway Protocol (BGP). With a Direct Connect gateway, allowed prefixes are originated to your on-premises router using BGP. With a peering attachment, you must create a static route in the transit gateway route table to point to the peering attachment.
  
  👍 1
  woorkim2025/02/01
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