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Question 16

EC2 instances are launched from Amazon Machine images (AMIs). A given public AMI can:

A.be used to launch EC2 Instances in any AWS region.
B.only be used to launch EC2 instances in the same country as the AMI is stored.
C.only be used to launch EC2 instances in the same AWS region as the AMI is stored.
D.only be used to launch EC2 instances in the same AWS availability zone as the AMI is stored

Question 17

A company has an internet-facing application that uses Web Identity Federation to obtain a temporary credential from AWS Security Token Service (AWS STS). The app then uses the token to access AWS services.
Review the following response:

Based on the response displayed what permissions are associated with the call from the application?

A.Permissions associated with the account that owns the AWS service
B.Permissions associated with the role AROACLKWSDQRAOEXAMPLE:app1
C.Permissions associated with the default role used when the AWS service was built
D.Permission associated with the IAM principal that owns the AccessKeyID ASgeIAIOSFODNN7EXAMPLE

Question 18

A developer is changing the configuration for a CPU-intensive AWS Lambda function that runs once an hour.
The function usually takes 45 seconds to run, but sometimes the run time is up to 1 minute. The timeout parameter is set to 3 minutes, and all other parameters are set to default.
The developer needs to optimize the run time of this function.
Which solution will meet this requirement?

A.Increase the function's reserved concurrency
B.Redeploy the function within the default VPC
C.Redeploy the function by using Lambda layers
D.Increase the function's memory.

Question 19

A Developer is designing a fault-tolerant environment where client sessions will be saved.
How can the Developer ensure that no sessions are lost if an Amazon EC2 instance fails?

A.Use Elastic Load Balancer connection draining to stop sending requests to failing instances.
B.Use sticky sessions with an Elastic Load Balancer target group.
C.Use Amazon DynamoDB to perform scalable session hadling.
D.Use Amazon SQS to save session data.

Question 20

A set of APIs are exposed to customers using the Amazon API Gateway. These APIs have caching enabled on the API Gateway. Customers have asked for an option to invalidate this cache for each of the APIs.
What action can be taken to allow API customers to invalidate the API Cache?

A.Ask customers to pass an HTTP header called Cache-Control:max-age=0.
B.Ask customers to use AWS credentials to call the InvalidateCache API.
C.Ask customers to add a query string parameter called "INVALIDATE_CACHE" when making an API call.
D.Ask customers to invoke an AWS API endpoint which invalidates the cache.