AWS-Certified-Solutions-Architect-Professional Free Practice Test

True or False: In Amazon EIastiCache replication groups of Redis, for performance tuning reasons, you can change the roles of the cache nodes within the replication group, with the primary and one of the replicas exchanging roles.

1. A. True, however, you get lower performance.
2. B. FALSE
3. C. TRUE
4. D. False, you must recreate the replication group to improve performance tunin

Correct Answer: C
In Amazon EIastiCache, a replication group is a collection of Redis Cache Clusters, with one primary read-write cluster and up to five secondary, read-only clusters, which are called read replicas. You can change the roles of the cache clusters within the replication group, with the primary cluster and one of the replicas exchanging roles. You might decide to do this for performance tuning reasons.
Reference: http://docs.aws.amazon.com/AmazonEIastiCache/Iatest/UserGuide/Replication.Redis.Groups.htmI

Your company is in the process of developing a next generation pet collar that collects biometric information to assist families with promoting healthy lifestyles for their pets Each collar will push 30kb of biometric data In JSON format every 2 seconds to a collection platform that will process and analyze the data providing health trending information back to the pet owners and veterinarians via a web portal Nlanagement has tasked you to architect the collection platform ensuring the following requirements are met.
Provide the ability for real-time analytics of the inbound biometric data Ensure processing of the biometric data is highly durable. Elastic and parallel The results of the analytic processing should be persisted for data mining
Which architecture outlined below win meet the initial requirements for the collection platform?

1. A. Utilize S3 to collect the inbound sensor data analyze the data from S3 with a daily scheduled Data Pipeline and save the results to a Redshift Cluster.
2. B. Utilize Amazon Kinesis to collect the inbound sensor data, analyze the data with Kinesis clients and save the results to a Redshift cluster using EMR.
3. C. Utilize SQS to collect the inbound sensor data analyze the data from SQS with Amazon Kinesis and save the results to a Microsoft SQL Server RDS instance.
4. D. Utilize EMR to collect the inbound sensor data, analyze the data from EUR with Amazon Kinesis and save me results to DynamoDB.

Correct Answer: B

You are the new IT architect in a company that operates a mobile sleep tracking application.
When activated at night, the mobile app is sending collected data points of 1 kilobyte every 5 minutes to your backend.
The backend takes care of authenticating the user and writing the data points into an Amazon DynamoDB table.
Every morning, you scan the table to extract and aggregate last night's data on a per user basis, and store the results in Amazon S3. Users are notified via Amazon SNS mobile push notifications that new data is available, which is parsed and visualized by the mobile app.
Currently you have around 100k users who are mostly based out of North America. You have been tasked to optimize the architecture of the backend system to lower cost. What would you recommend? Choose 2 answers

1. A. Have the mobile app access Amazon DynamoDB directly Instead of JSON files stored on Amazon S3.
2. B. Write data directly into an Amazon Redshift cluster replacing both Amazon DynamoDB and Amazon S3.
3. C. Introduce an Amazon SQS queue to buffer writes to the Amazon DynamoDB table and reduce provisioned write throughput.
4. D. Introduce Amazon Elasticache to cache reads from the Amazon DynamoDB table and reduce provisioned read throughput.
5. E. Create a new Amazon DynamoDB table each day and drop the one for the previous day after its data is on Amazon S3.

Correct Answer: AD

Which of the following statements is correct about the number of security groups and rules applicable for an EC2-Classic instance and an EC2-VPC network interface?

1. A. In EC2-Classic, you can associate an instance with up to 5 security groups and add up to 50 rules to a security grou
2. B. In EC2-VPC, you can associate a network interface with up to 500 security groups and add up to 100 rules to a security group.
3. C. In EC2-Classic, you can associate an instance with up to 500 security groups and add up to 50 rules to a security grou
4. D. In EC2-VPC, you can associate a network interface with up to 5 security groups and add up to 100 rules to a security group.
5. E. In EC2-Classic, you can associate an instance with up to 5 security groups and add up to 100 rules to a security grou
6. F. In EC2-VPC, you can associate a network interface with up to 500 security groups and add up to 50 rules to a security group.
7. G. In EC2-Classic, you can associate an instance with up to 500 security groups and add up to 100 rules to a security grou
8. H. In EC2-VPC, you can associate a network interface with up to 5 security groups and add up to 50 rules to a security group.

Correct Answer: D
A security group acts as a virtual firewall that controls the traffic for one or more instances. When you launch an instance, you associate one or more security groups with the instance. You add rules to each security group that allow traffic to or from its associated instances. If you're using EC2-Classic, you must use security groups created specifically for EC2-Classic. In EC2-Classic, you can associate an instance with up to 500 security groups and add up to 100 rules to a security group. If you're using EC2-VPC, you must use security groups created specifically for your VPC. In EC2-VPC, you can associate a network interface with up to 5 security groups and add up to 50 rules to a security group.
Reference: http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/using-network-security.html

What is the average queue length recommended by AWS to achieve a lower latency for the 200 PIOPS EBS volume?

1. A. 5
2. B. 1
3. C. 2
4. D. 4

Correct Answer: B
The queue length is the number of pending I/O requests for a device. The optimal average queue length will vary for every customer workload, and this value depends on a particular appIication's sensitMty to IOPS and latency. If the workload is not delivering enough I/O requests to maintain the optimal average queue length, then the EBS volume might not consistently deliver the IOPS that have been provisioned. However, if the workload maintains an average queue length that is higher than the optimal value, then the per-request I/O latency will increase; in this case, the user should provision more IOPS for his volume. AWS recommends that the user should target an optimal average queue length of 1 for every 200 provisioned IOPS and tune that value based on his application requirements.
Reference: http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ebs-workload-demand.htmI