Answer-first summary for fast verification
Answer: Add 10.0.32.0/21 and 10.0.40.0/21 to the allowed prefix list.
The correct approach to advertise the routes from AWS to on-premises, given the scenario, involves ensuring that the CIDR blocks for the new VPCs are added to the allowed prefix list. This is because the allowed prefix list is used by the Direct Connect gateway to determine which routes can be advertised to on-premises networks. Adding the specific CIDR blocks (10.0.32.0/21 and 10.0.40.0/21) to the allowed prefix list ensures that these routes are advertised correctly without exceeding the prefix list quota. Option B is correct because it directly addresses the requirement by adding the specific CIDR blocks to the allowed prefix list. Option A is incorrect because it suggests adding the CIDR blocks to AWS managed prefix lists, which is not relevant for route advertisement to on-premises networks. Options C and D are incorrect because they suggest adding a larger CIDR block (10.0.32.0/20) which is not necessary and could potentially include more IP addresses than intended, leading to inefficient routing or exceeding the prefix list quota.
Author: LeetQuiz Editorial Team
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A network engineer is designing hybrid connectivity using AWS Direct Connect and AWS Transit Gateway. The transit gateway is connected to a Direct Connect gateway and 19 VPCs across multiple AWS accounts. Two additional VPCs are being attached to the transit gateway, with IP address assignments of 10.0.32.0/21 for the first VPC and 10.0.40.0/21 for the second VPC. The prefix list has only one CIDR block remaining before reaching its maximum entry limit.
What steps should the network engineer take to advertise the routes from AWS to on-premises while adhering to these constraints?
A
Add 10.0.32.0/21 and 10.0.40.0/21 to both AWS managed prefix lists.
B
Add 10.0.32.0/21 and 10.0.40.0/21 to the allowed prefix list.
C
Add 10.0.32.0/20 to both AWS managed prefix lists.
D
Add 10.0.32.0/20 to the allowed prefix list.
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