A DevOps Engineer Is Researching the Least-Expensive Way to Implement

question 279

Multiple Choice

A DevOps Engineer is researching the least-expensive way to implement an image batch processing cluster in AWS. The application cannot run in Docker containers and must run on Amazon EC2. The batch job stores checkpoint data on a Network File System (NFS) and can tolerate interruptions. Configuring the cluster software from a bare EC2 Amazon Linux image takes 30 minutes. Which is the MOST cost-effective solution?

• A) Use Amazon EFS for checkpoint data. To complete the job, use an EC2 Auto Scaling group and an On-Demand pricing model to provision EC2 instances temporarily.
• B) Use ClusterFS on EC2 instances for checkpoint data. To run the batch job, configure EC2 instances manually. When the job completes, shut down the instances manually.
• C) Use Amazon EFS for checkpoint data. Use EC2 Fleet to launch EC2 Spot Instances, and use user data to configure the EC2 Amazon Linux instance on startup.
• D) Use Amazon EFS for checkpoint data. Use EC2 Fleet to launch EC2 Spot Instances. Create a standard cluster AMI and use the latest AMI when creating instances.

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Definitions:

Backward Chaining

A method for teaching a stimulus–response chain. When backward chaining is used, the reinforcing power of the positive reinforcer (presented at the end of the chain) is transferred “down the line” to each discriminative stimulus as it is added to the chain. This makes for very efficient use of positive reinforcement to establish a strong chain.

Terminal Response

This is the final action or series of actions that occurs at the end of a behavioral chain, often considered the goal behavior in training or therapy.

Conditioned

In psychology, refers to behavior that is developed or learned in response to specific environmental stimuli.

Reinforcer

Any stimulus or event that increases the likelihood of a behavior being repeated, which can be positive (adding something desirable) or negative (removing something aversive).