- (Exam Topic 3)
A company runs an application on a group of Amazon Linux EC2 instances. For compliance reasons, the company must retain all application log files for 7 years. The log files will be analyzed by a reporting tool that must be able to access all the files concurrently.
Which storage solution meets these requirements MOST cost-effectively?

1. A. Amazon Elastic Block Store (Amazon EBS)
2. B. Amazon Elastic File System (Amazon EFS)
3. C. Amazon EC2 instance store
4. D. Amazon S3

Correct Answer: D

- (Exam Topic 1)
A company provides a Voice over Internet Protocol (VoIP) service that uses UDP connections. The service consists of Amazon EC2 instances that run in an Auto Scaling group. The company has deployments across multiple AWS Regions.
The company needs to route users to the Region with the lowest latency. The company also needs automated failover between Regions.
Which solution will meet these requirements?

1. A. Deploy a Network Load Balancer (NLB) and an associated target grou
2. B. Associate the target group with the Auto Scaling grou
3. C. Use the NLB as an AWS Global Accelerator endpoint in each Region.
4. D. Deploy an Application Load Balancer (ALB) and an associated target grou
5. E. Associate the target group with the Auto Scaling grou
6. F. Use the ALB as an AWS Global Accelerator endpoint in each Region.
7. G. Deploy a Network Load Balancer (NLB) and an associated target grou
8. H. Associate the target group with the Auto Scaling grou
9. I. Create an Amazon Route 53 latency record that points to aliases for each NL
10. J. Create an Amazon CloudFront distribution that uses the latency record as an origin.
11. K. Deploy an Application Load Balancer (ALB) and an associated target grou
12. L. Associate the target group with the Auto Scaling grou
13. M. Create an Amazon Route 53 weighted record that points to aliases for each AL
14. N. Deploy an Amazon CloudFront distribution that uses the weighted record as an origin.

Correct Answer: D
https://aws.amazon.com/global-accelerator/faqs/
HTTP /HTTPS - ALB ; TCP and UDP - NLB; Lowest latency routing and more throughput. Also supports failover, uses Anycast Ip addressing - Global Accelerator Caching at Egde Locations – Cloutfront
WS Global Accelerator automatically checks the health of your applications and routes user traffic only to healthy application endpoints. If the health status changes or you make configuration updates, AWS Global Accelerator reacts instantaneously to route your users to the next available endpoint..

- (Exam Topic 2)
A company runs a production application on a fleet of Amazon EC2 instances. The application reads the data from an Amazon SQS queue and processes the messages in parallel. The message volume is unpredictable and often has intermittent traffic. This application should continually process messages without any downtime.
Which solution meets these requirements MOST cost-effectively?

1. A. Use Spot Instances exclusively to handle the maximum capacity required.
2. B. Use Reserved Instances exclusively to handle the maximum capacity required.
3. C. Use Reserved Instances for the baseline capacity and use Spot Instances to handle additional capacity.
4. D. Use Reserved Instances for the baseline capacity and use On-Demand Instances to handle additional capacity.

Correct Answer: D
We recommend that you use On-Demand Instances for applications with short-term, irregular workloads that cannot be interrupted.
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-on-demand-instances.html

- (Exam Topic 2)
A gaming company hosts a browser-based application on AWS. The users of the application consume a large number of videos and images that are stored in Amazon S3. This content is the same for all users.
The application has increased in popularity, and millions of users worldwide are accessing these media files. The company wants to provide the files to the users while reducing the load on the origin.
Which solution meets these requirements MOST cost-effectively?

1. A. Deploy an AWS Global Accelerator accelerator in front of the web servers.
2. B. Deploy an Amazon CloudFront web distribution in front of the S3 bucket.
3. C. Deploy an Amazon ElastiCache for Redis instance in front of the web servers.
4. D. Deploy an Amazon ElastiCache for Memcached instance in front of the web servers.

Correct Answer: B

- (Exam Topic 3)
An ecommerce company is running a multi-tier application on AWS. The front-end and backend tiers run on Amazon EC2, and the database runs on Amazon RDS for MYSQL. The backend tier communities with the RDS instance. There are frequent calls to return identical database from the database that are causing performance slowdowns.
Which action should be taken to improve the performance of the backend?

1. A. Implement Amazon SNS to store the database calls.
2. B. Implement Amazon ElasticCache to cache the large database.
3. C. Implement an RDS for MySQL read replica to cache database calls.
4. D. Implement Amazon Kinesis Data Firehose to stream the calls to the database.

Correct Answer: B