Amazon DOP-C02 Practice Questions - Page 43

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Question 421

You have a high security requirement for your AWS accounts.

What is the most rapid and sophisticated setup you can use to react to AWS API calls to your account?

Subscription to AWS Config via an SNS Topic. Use a Lambda Function to perform in-flight analysis and reactivity to changes as they occur.

Global AWS CloudTrail setup delivering to S3 with an SNS subscription to the deliver notifications, pushing into a Lambda, which inserts records into an ELK stack for analysis.

Use a CloudWatch Rule ScheduleExpression to periodically analyze IAM credential logs. Push the deltas for events into an ELK stack and perform ad-hoc analysis there.

CloudWatch Events Rules which trigger based on all AWS API calls, submitting all events to an AWS Kinesis Stream for arbitrary downstream analysis.

Question 422

What method should you use to author automation if you want to wait for a CloudFormation stack to finish completing in a script?

Event subscription using SQS.

Event subscription using SNS.

Poll using <code>ListStacks</code> / <code>list-stacks</code>

Poll using <code>GetStackStatus</code> / <code>get-stack-status</code>

Question 423

Your application consists of 10% writes and 90% reads. You currently service all requests through a Route53 Alias Record directed towards an AWS ELB, which sits in front of an EC2 Auto Scaling Group. Your system is getting very expensive when there are large traffic spikes during certain news events, during which many more people request to read similar data all at the same time.

What is the simplest and cheapest way to reduce costs and scale with spikes like this?

Create an S3 bucket and asynchronously replicate common requests responses into S3 objects. When a request comes in for a precomputed response, redirect to AWS S3.

Create another ELB and Auto Scaling Group layer mounted on top of the other system, adding a tier to the system. Serve most read requests out of the top layer.

Create a CloudFront Distribution and direct Route53 to the Distribution. Use the ELB as an Origin and specify Cache Behaviours to proxy cache requests which can be served late.

Create a Memcached cluster in AWS ElastiCache. Create cache logic to serve requests which can be served late from the in-memory cache for increased performance.

Question 424

You need to perform ad-hoc business analytics queries on well-structured data. Data comes in constantly at a high velocity. Your business intelligence team can understand SQL. What AWS service(s) should you look to first?

Kinesis Firehose + RDS

Kinesis Firehose + RedShift

EMR using Hive

EMR running Apache Spark

Question 425

You are building a game high score table in DynamoDB. You will store each user's highest score for each game, with many games, all of which have relatively similar usage levels and numbers of players. You need to be able to look up the highest score for any game.

What is the best DynamoDB key structure?

HighestScore as the hash / only key.

GameID as the hash key, HighestScore as the range key.

GameID as the hash / only key.

GameID as the range / only key.

Question 426

What is server immutability?

Not updating a server after creation.

The ability to change server counts.

Updating a server after creation.

The inability to change server counts.

Question 427

You run a clustered NoSQL database on AWS EC2 using AWS EBS. You need to reduce latency for database response times. Performance is the most important concern, not availability. You did not perform the initial setup, someone without much AWS knowledge did, so you are not sure if they configured everything optimally. Which of the following is NOT likely to be an issue contributing to increased latency?

The EC2 instances are not EBS Optimized.

The database and requesting system are both in the wrong Availability Zone.

The EBS Volumes are not using PIOPS.

The database is not running in a placement group.

Question 428

Fill the blanks: __________ helps us track AWS API calls and transitions, _________ helps to understand what resources we have now, and ________ allows auditing credentials and logins.

AWS Config, CloudTrail, IAM Credential Reports

CloudTrail, IAM Credential Reports, AWS Config

CloudTrail, AWS Config, IAM Credential Reports

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