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AWS Certified Advanced Networking - Specialty · AWS
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D is correct as you have to summarize both subnets into one. x.x.32.0/21 x.x.40.0/21 Both routes/subnets have 4 bits in common in the third octet. 0 0 1 0 0 0 0 0 = 32 0 0 1 0 1 0 0 0 = 40 When summarized you will have 20 network bits which gives you a /20.
I think that it's correct answer is D.
If only one CIDR block can be added to the prefix list (due to reaching the maximum quota), then it will be impossible to add both 10.0.32.0/21 and 10.0.40.0/21 separately. However, by aggregating the two CIDR blocks into a single CIDR block (10.0.32.0/20), the network engineer can still add the routes for both VPCs to the allowed prefix list. This is because 10.0.32.0/20 covers IP addresses from 10.0.32.0 to 10.0.47.255, which includes the addresses from both 10.0.32.0/21 (10.0.32.0 to 10.0.39.255) and 10.0.40.0/21 (10.0.40.0 to 10.0.47.255).