ANS-C01 Question 352
Select 2An organization is designing a new multi-region architecture that involves multiple VPCs connected through AWS Transit Gateway. During testing, they notice that certain traffic routes between VPCs are not functioning as expected. Upon investigation, they find that the number of routes in the route tables associated with the Transit Gateway is nearing the limit. What steps can the organization take to resolve this issue?
- A
Aggregate the routes using CIDR blocks to reduce the total number of routes in the Transit Gateway route tables.
- B
Increase the route table limit for the Transit Gateway by contacting AWS Support.
- C
Replace the AWS Transit Gateway with VPC peering to bypass route table limits.
- D
Split the architecture into multiple Transit Gateways and interconnect them using Transit Gateway peering.
- E
Enable accelerated routing mode for Transit Gateway to bypass route table limits.
Show answer and explanation
Correct answers: A, D
Explanation
AWS Transit Gateway has a limit on the number of routes that can be added to its route tables. To address this limitation, the organization can aggregate routes using CIDR blocks to reduce the overall number of routes or split the architecture into multiple Transit Gateways and interconnect them using Transit Gateway peering. Contacting AWS Support does not increase route table limits, and transitioning to VPC peering is less scalable and does not solve the underlying issue of route limits.
- A. Correct.
Aggregating routes using CIDR blocks can reduce the number of individual routes in the route tables, helping stay within the limit. This is a valid and efficient solution.
- B. Incorrect.
AWS Transit Gateway route table limits are fixed and cannot be increased, even by contacting AWS Support. This option is incorrect.
- C. Incorrect.
Replacing AWS Transit Gateway with VPC peering is not a scalable solution and does not address route table limits effectively. This option is incorrect.
- D. Correct.
Splitting the architecture into multiple Transit Gateways and connecting them through Transit Gateway peering is a valid approach to manage route table limits.
- E. Incorrect.
There is no feature called 'accelerated routing mode' for Transit Gateway. This option is incorrect.