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A major finance organisation has engaged your company to set up a large data mining application. Using AWS you decide the best service for this is Amazon Elastic MapReduce(EMR) which you know uses Hadoop. Which of the following statements best describes Hadoop?

  1. Hadoop is 3rd Party software which can be installed using AMI
  2. Hadoop is an open source python web framework
  3. Hadoop is an open source Java software framework
  4. Hadoop is an open source javascript framework

Answer(s): C

Explanation:

Amazon EMR uses Apache Hadoop as its distributed data processing engine. Hadoop is an open source, Java software framework that supports data-intensive distributed applications running on large clusters of commodity hardware. Hadoop implements a programming model named "MapReduce," where the data is divided into many small fragments of work, each of which may be executed on any node in the cluster.
This framework has been widely used by developers, enterprises and startups and has proven to be a reliable software platform for processing up to petabytes of data on clusters of thousands of commodity machines.


Reference:

http://aws.amazon.com/elasticmapreduce/faqs/



A website experiences unpredictable traffic. During peak traffic times, the database is unable to keep up with the write request.
Which AWS service will help decouple the web application from the database?

  1. Amazon SQS
  2. Amazon EFS
  3. Amazon S3
  4. AWS Lambda

Answer(s): A

Explanation:

https://aws.amazon.com/sqs/faqs/



A Solutions Architect is developing a new web application on AWS. The Architect expects the application to become very popular, so the application must scale to support the load. The Architect wants to focus on software development and deploying new features without provisioning or managing instances.
What solution is appropriate?

  1. Amazon API Gateway and AWS Lambda
  2. Elastic Load Balancing with Auto Scaling groups and Amazon EC2
  3. Amazon API Gateway and Amazon EC2
  4. Amazon CloudFront and AWS Lambda

Answer(s): A



A client has set up an Auto Scaling group associated with a load balancer. The client has noticed that instances launched by the Auto Scaling group are reported unhealthy as the result of an Elastic Load Balancing (ELB) health check, but these unhealthy instances are not being terminated. What can a Solutions Architect do to ensure that the instances marked unhealthy will be terminated and replaced?

  1. Increase the value for the health check interval set on the ELB load balancer.
  2. Change the thresholds set on the Auto Scaling group health check.
  3. Change the health check type to ELB for the Auto Scaling group.
  4. Change the health check set on the ELB load balancer to use TCP rather than HTTP checks.

Answer(s): C



A user is launching an EC2 instance in the US East region. Which of the below mentioned options is recommended by AWS with respect to the selection of the availability zone?

  1. Always select the AZ while launching an instance
  2. Always select the US-East-1-a zone for HA
  3. Do not select the AZ; instead let AWS select the AZ
  4. The user can never select the availability zone while launching an instance

Answer(s): C

Explanation:

When launching an instance with EC2, AWS recommends not to select the availability zone (AZ). AWS specifies that the default Availability Zone should be accepted. This is because it enables AWS to select the best Availability Zone based on the system health and available capacity. If the user launches additional instances, only then an Availability Zone should be specified. This is to specify the same or different AZ from the running instances.


Reference:

http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/using-regions-availability- zones.html



A user wants to use an EBS-backed Amazon EC2 instance for a temporary job. Based on the input data, the job is most likely to finish within a week. Which of the following steps should be followed to terminate the instance automatically once the job is finished?

  1. Configure the EC2 instance with a stop instance to terminate it.
  2. Configure the EC2 instance with ELB to terminate the instance when it remains idle.
  3. Configure the CloudWatch alarm on the instance that should perform the termination action once the instance is idle.
  4. Configure the Auto Scaling schedule activity that terminates the instance after 7 days.

Answer(s): C

Explanation:

Auto Scaling can start and stop the instance at a pre-defined time. Here, the total running time is unknown. Thus, the user has to use the CloudWatch alarm, which monitors the CPU utilization. The user can create an alarm that is triggered when the average CPU utilization percentage has been lower than 10 percent for 24 hours, signaling that it is idle and no longer in use. When the utilization is below the threshold limit, it will terminate the instance as a part of the instance action.


Reference:

http://docs.aws.amazon.com/AmazonCloudWatch/latest/DeveloperGuide/UsingAlarmActions.html



A Solutions Architect is working on a PCI-compliant architecture that needs to call an external service provider's API. The external provider requires IP whitelisting to verify the calling party.
How should the Solutions Architect provide the external party with the IP addresses for whitelisting?

  1. Use an API Gateway in proxy mode, and provide the API Gateway's IP address to the external service provider.
  2. Associate a public elastic network interface to a published stage/endpoint in API Gateway, exposing the AWS Lambda function, and provide the IP address for the public network interface to the external party to whitelist.
  3. Deploy the Lambda function in private subnets and route outbound traffic through a NAT gateway. Provide the NAT gateway's Elastic IP address to the external service provider.
  4. Provide the external party the allocated AWS IP address range for Lambda functions, and send change notifications by using a subscription to the AmazonIpSpaceChanged SNS topic.

Answer(s): C

Explanation:

There is no such a thing of "API Gateway's IP address".



A Solutions Architect is designing an application in AWS. The Architect must not expose the
application or database tier over the Internet for security reasons. The application must be low- cost and have a scalable front end. The databases and application tier must have only one-way Internet access to download software and patch updates.
Which solution helps to meet these requirements?

  1. Use a NAT Gateway as the front end for the application tier and to enable the private resources to have Internet access.
  2. Use an Amazon EC2-based proxy server as the front end for the application tier, and a NAT Gateway to allow Internet access for private resources.
  3. Use an ELB Classic Load Balancer as the front end for the application tier, and an Amazon EC2 proxy server to allow Internet access for private resources.
  4. Use an ELB Classic Load Balancer as the front end for the application tier, and a NAT Gateway to allow Internet access for private resources.

Answer(s): D



A Solutions Architect is designing an elastic application that will have between 10 and 50 Amazon EC2 concurrent instances running, dependent on load. Each instance must mount storage that will read and write to the same 50 GB folder.
Which storage type meets the requirements?

  1. Amazon S3
  2. Amazon EFS
  3. Amazon EBS volumes
  4. Amazon EC2 instance store

Answer(s): B



A retail company operates an e-commerce environment that runs on Amazon EC2 instances behind an Application Load Balancer. The instances run in an Amazon EC2 Auto Scaling group. Images are hosted in an Amazon S3 bucket using a custom domain name. During a flash sale with 10,000 simultaneous users, some images on the website are not loading.
What should be done to resolve the performance issue?

  1. Move the images to the EC2 instances in the Auto Scaling group.
  2. Enable Transfer Acceleration for the S3 bucket.
  3. Configure an Amazon CloudFront distribution with the S3 bucket as the origin.
  4. Increase the number of minimum, desired, and maximum EC2 instances in the Auto Scaling group.

Answer(s): C




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