Free AWS SAA-C03 Actual Exam Questions – Solutions Architect Questions - Question 15 Discussion
instances run in private subnets of a VPC. The Lambda functions need direct network access to the
EC2 instances for the application to work.
The application will run for 1 year. The number of Lambda functions that the application uses will
increase during the 1-year period. The company must minimize costs on all application resources.
Which solution will meet these requirements?
I agree with the focus on cost efficiency and network access. Option C stands out because the Compute Savings Plan covers both Lambda and EC2, which makes it cheaper as Lambda usage grows over the year. Plus, connecting Lambda functions to the private subnets ensures direct access to EC2 instances without exposing them publicly. Options A and B only cover EC2 discounts or mess with subnet types, which won’t meet the network requirements or cost goals as well. D doesn’t address direct network access since keeping Lambda in the service VPC won’t reach private EC2 instances properly. So, C seems
B tbh doesn’t work because public subnets won’t allow direct private IP access to EC2 in private subnets. The Lambda functions must be in private subnets or connected via VPC for that communication.
A imo, the key is that the Lambda functions need direct network access to EC2 in private subnets. So connecting Lambdas to public subnets (option B) won’t give that private connectivity. Also, EC2 Instance Savings Plans don’t cover Lambda usage, so buying one (A or B) won’t minimize costs for Lambda at scale. The Compute Savings Plan (C or D) covers both compute types, but since Lambdas must access private subnets, keeping them in the default Lambda VPC without VPC config (D) won’t work. Hence, C fits best.
It’s C since Compute Savings Plan covers both Lambda and EC2, plus direct private subnet access.
Option C makes sense since Compute Savings Plan covers Lambda and EC2, plus private subnet access fits the need.
Does the Lambda need VPC access for private IP connectivity or just internet access?