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NEW QUESTION 36
You are getting a lot of empty receive requests when using Amazon SQS.
This is making a lot of unnecessary network load on your instances.
What can you do to reduce this load?

• A. Use as long of a poll as possible, instead of short polls.
• B. Use <code>sqsd</code> on your EC2 instances.
• C. Alter your visibility timeout to be shorter.
• D. Subscribe your queue to an SNS topic instead.

Answer: A

Explanation:
One benefit of long polling with Amazon SQS is the reduction of the number of empty responses, when there are no messages available to return, in reply to a ReceiveMessage request sent to an Amazon SQS queue. Long polling allows the Amazon SQS service to wait until a message is available in the queue before sending a response.
http://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/sqs-long- polling.html

NEW QUESTION 37
You have an application consisting of a stateless web server tier running on Amazon EC2 instances behind load balancer, and are using Amazon RDS with read replicas. Which of the following methods should you use to implement a self-healing and cost-effective architecture?
Choose 2 answers from the optionsgiven below

• A. Set up scripts on each Amazon EC2 instance to frequently send ICMP pings to the load balancer in order to determine which instance is unhealthy and replace it.
• B. Set up an Auto Scalinggroup for the web server tier along with an Auto Scaling policy that uses the Amazon EC2 CPU utilization CloudWatch metric to scale the instances.
• C. Use an Amazon RDS Multi-AZ deployment.
• D. Set up an Auto Scalinggroup for the web server tier along with an Auto Scaling policy that uses the Amazon RDS DB CPU utilization Cloud Watch metric to scale the instances.
• E. Set up an Auto Scalinggroup for the database tier along with an Auto Scaling policy that uses the Amazon RDS read replica lag CloudWatch metric to scale out the Amazon RDS read replicas.
• F. Set up a third-party monitoring solution on a cluster of Amazon EC2 instances in order to emit custom Cloud Watch metrics to trigger the termination of unhealthy Amazon EC2 instances.
• G. Use a larger Amazon EC2 instance type for the web server tier and a larger DB instance type for the data storage layer to ensure that they don't become unhealthy.

Answer: B,C

Explanation:
The scaling of CC2 Instances in the Autoscaling group is normally done with the metric of the CPU utilization of the current instances in the Autoscaling group For more information on scaling in your Autoscaling Group, please refer to the below link:
http://docs.aws.a mazon.com/autoscaling/latest/userguide/as-scaling-si mple-step.html Amazon RDS Multi-AZ deployments provide enhanced availability and durability for Database (DB) Instances, making them a natural fit for production database workloads. When you provision a Multi- AZ DB Instance, Amazon RDS automatically creates a primary DB Instance and synchronously replicates the data to a standby instance in a different Availability Zone (AZ). Cach AZ runs on its own physically distinct, independent infrastructure, and is engineered to be highly reliable. In case of an infrastructure failure, Amazon RDS performs an automatic failover to the standby for to a read replica in the case of Amazon Aurora), so that you can resume database operations as soon as the failover is complete. For more information on RDS Multi-AZ please refer to the below link:
https://aws.amazon.com/rds/details/multi-az/
Option A is invalid because if you already have in-built metrics from Cloudwatch, why would you want to spend more in using a a third-party monitoring solution.
Option B is invalid because health checks are already a feature of AWS CLB Option C is invalid because the database CPU usage should not be used to scale the web tier.
Option C is invalid because increasing the instance size does not always guarantee that the solution will not become unhealthy.
Option F is invalid because increasing Read-Replica's will not suffice for write operations if the primary DB fails.

NEW QUESTION 38
Which of the following is false when it comes to using the Elastic Load balancer with Opsworks stacks?

• A. A Classic Load Balancer can span across AWSOpsWorks Stacks layers.
• B. Youcan attach only one load balancer to a layer.
• C. Youneed to create the load balancer before hand and then attach it to the Opsworkstack.
• D. Eachload balancer can handle only one layer.

Answer: A

Explanation:
Explanation
The AWS Documentation mentions the following
To use Clastic Load Balancing with a stack, you must first create one or more load balancers in the same region by using the Clastic Load Balancing console, CLI, or API. You should be aware of the following:
You can attach only one load balancer to a layer.
Cach load balancer can handle only one layer.
AWS
OpsWorks Stacks does not support Application Load Balancer. You can only use Classic Load Balancer with AWS OpsWorks Stacks. For more information on Clastic Load Balancer with Opswork, please visit the below url http://docs.aws.a mazon.com/opsworks/latest/userguide/layers-elb.html

NEW QUESTION 39
A DevOps Engineer manages an application that has a cross-region failover requirement. The application stores its data in an Amazon Aurora on Amazon RDS database in the primary region with a read replica in the secondary region. The application uses Amazon Route 53 to direct customer traffic to the active region. Which steps should be taken to MINIMIZE downtime if a primary database fails?

• A. Set up an Amazon CloudWatch Events rule to periodically invoke an AWS Lambda function that checks the health of the primary database. If a failure is detected, the Lambda function promotes the read replica. Then, update Route 53 to redirect traffic from the primary to the secondary region.
• B. Use RDS Event Notification to publish status updates to an Amazon SNS topic. Use an AWS Lambda function subscribed to the topic to monitor database health. In the event of a failure, the Lambda function promotes the read replica, then updates Route 53 to redirect traffic from the primary region to the secondary region.
• C. Use Amazon CloudWatch to monitor the status of the RDS instance. In the event of a failure, use a CloudWatch Events rule to send a short message service (SMS) to the Systems Operator using Amazon SNS. Have the Systems Operator redirect traffic to an Amazon S3 static website that displays a downtime message. Promote the RDS read replica to the master. Confirm that the application is working normally, then redirect traffic from the Amazon S3 website to the secondary region.
• D. Set up Route 53 to balance traffic between both regions equally. Enable the Aurora multi-master option, then set up a Route 53 health check to analyze the health of the databases. Configure Route 53 to automatically direct all traffic to the secondary region when a primary database fails.

Answer: B

Explanation:
https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/USER_Events.html

NEW QUESTION 40
......

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