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July 30, 2017

Beginners Guide: aws solution architect associate certification

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Q221. After setting up an EC2 security group with a cluster of 20 EC2 instances, you find an error in the security group settings. You quickly make changes to the security group settings. When will the changes to the settings be effective?

A. The settings will be effective immediately for all the instances in the security group.

B. The settings will be effective only when all the instances are restarted.

C. The settings will be effective for all the instances only after 30 minutes.

D. The settings will be effective only for the new instances added to the security group. 

Answer: A

Explanation:

Amazon Redshift applies changes to a cluster security group immediately. So if you have associated the cluster security group with a cluster, inbound cluster access rules in the updated cluster security group apply immediately.

Reference:  http://docs.aws.amazon.com/redshift/latest/mgmt/working-with-security-groups.htm|


Q222. What is the data model of DynamoDB?

A. Since DynamoDB is schema-less, there is no data model.

B. "Items", with Keys and one or more Attribute; and "Attribute", with Name and Value.

C. "TabIe", a collection of Items; "Items", with Keys and one or more Attribute; and "Attribute", with Name and Value.

D. "Database", which is a set of "TabIes", which is a set of "Items", which is a set of "Attributes". 

Answer: C

Explanation:

The data model of DynamoDB is: "TabIe", a collection of Items;

"Items", with Keys and one or more Attribute; "Attribute", with Name and Value.

Reference:  http://docs.aws.amazon.com/amazondynamodb/latest/developerguide/DataModeI.html


Q223. True or False: Manually created DB Snapshots are deleted after the DB Instance is deleted.

A. TRUE

B. FALSE

Answer: A


Q224. Fill in the blanks: Resources that are created in AWS are identified by a unique identifier called an

A. Amazon Resource Number

B. Amazon Resource Nametag

C. Amazon Resource Name

D. Amazon Resource Namespace 

Answer: C


Q225. After deciding that EMR will be useful in analysing vast amounts of data for a gaming website that you are architecting you have just deployed an Amazon EMR Cluster and wish to monitor the cluster performance. Which of the following tools cannot be used to monitor the cluster performance?

A. Kinesis

B. Ganglia

C. C|oudWatch Metrics

D. Hadoop Web Interfaces 

Answer: A

Explanation:

Amazon EMR provides several tools to monitor the performance of your cluster. Hadoop Web Interfaces

Every cluster publishes a set of web interfaces on the master node that contain information about the cluster. You can access these web pages by using an SSH tunnel to connect them on the master node. For more information, see View Web Interfaces Hosted on Amazon EMR Clusters.

CIoudWatch Metrics

Every cluster reports metrics to CIoudWatch. CIoudWatch is a web service that tracks metrics, and which you can use to set alarms on those metrics. For more information, see Monitor Metrics with CIoudWatch. Ganglia

Ganglia is a cluster monitoring tool. To have this available, you have to install Ganglia on the cluster when you launch it. After you've done so, you can monitor the cluster as it runs by using an SSH tunnel to connect to the Ganglia UI running on the master node. For more information, see Monitor Performance with Ganglia.

Reference:

http://docs.aws.amazon.com/EIasticMapReduce/latest/DeveIoperGuide/emr-troubleshoot-tooIs.htmI


Q226. A user is hosting a website in the US West-1 region. The website has the highest client base from the Asia-Pacific (Singapore / Japan) region. The application is accessing data from S3 before serving it to client. Which of the below mentioned regions gives a better performance for S3 objects?

A. Japan

B. Singapore

C. US East

D. US West-1 

Answer: D

Explanation:

Access to Amazon S3 from within Amazon EC2 in the same region is fast. In this aspect, though the client base is Singapore, the application is being hosted in the US West-1 region. Thus, it is recommended that S3 objects be stored in the US-West-1 region.

Reference: http://media.amazonwebservices.com/AWS_Storage_Options.pdf


Q227. Your company runs a customer facing event registration site This site is built with a 3-tier architecture with web and application tier servers and a MySQL database The application requires 6 web tier servers and 6 application tier servers for normal operation, but can run on a minimum of 65% server capacity and a  single MySQL database. When deploying this application in a region with three availability zones (AZs) which architecture provides high availability?

A. A web tier deployed across 2 AZs with 3 EC2 (Elastic Compute Cloud) instances in each AZ inside an Auto Scaling Group behind an ELB (elastic load balancer), and an application tier deployed across 2 AZs with 3 EC2 instances in each AZ inside an Auto Scaling Group behind an ELB, and one RDS (Relational Database Service) instance deployed with read replicas in the other AZ.

B. A web tier deployed across 3 AZs with 2 EC2 (Elastic Compute Cloud) instances in each AZ inside an Auto Scaling Group behind an ELB (elastic load balancer) and an application tier deployed across 3 AZs with 2 EC2 instances in each AZ inside an Auto Scaling Group behind an ELB and one RDS (Relational Database Service) Instance deployed with read replicas in the two other AZs.

C. A web tier deployed across 2 AZs with 3 EC2 (Elastic Compute Cloud) instances in each AZ inside an Auto Scaling Group behind an ELB (elastic load balancer) and an application tier deployed across 2 AZs with 3 EC2 instances m each AZ inside an Auto Scaling Group behind an ELS and a Multi-AZ RDS (Relational Database Service) deployment.

D. A web tier deployed across 3 AZs with 2 EC2 (Elastic Compute Cloud) instances in each AZ Inside an Auto Scaling Group behind an ELB (elastic load balancer). And an application tier deployed across 3 AZs with 2 EC2 instances in each AZ inside an Auto Scaling Group behind an ELB. And a MuIti-AZ RDS (Relational Database services) deployment.

Answer:

Explanation:

Amazon RDS MuIti-AZ Deployments

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 MuIti-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). Each AZ runs on its own physically distinct, independent infrastructure, and is engineered to be highly reliable. In case of an infrastructure failure (for example, instance hardware failure, storage failure, or network disruption), Amazon RDS performs an automatic failover to the standby, so that you can resume database operations as soon as the failover is complete. Since the endpoint for your DB Instance remains the same after a failover, your application can resume database operation without the need for manual administrative intervention.

Enhanced Durability

MuIti-AZ deployments for the MySQL, Oracle, and PostgreSQL engines utilize synchronous physical replication to keep data on the standby up-to-date with the primary. MuIti-AZ deployments for the SQL Server engine use synchronous logical replication to achieve the same result, employing SQL

Server-native Mrroring technology. Both approaches safeguard your data in the event of a DB Instance failure or loss of an Availability Zone.

If a storage volume on your primary fails in a Multi-AZ deployment, Amazon RDS automatically initiates a failover to the up-to-date standby. Compare this to a Single-AZ deployment: in case of a Single-AZ database failure, a user-initiated point-in-time-restore operation will be required. This operation can take several hours to complete, and any data updates that occurred after the latest restorable time (typically within the last five minutes) will not be available.

Amazon Aurora employs a highly durable, SSD-backed virtualized storage layer purpose-built for database workloads. Amazon Aurora automatically replicates your volume six ways, across three Availability Zones. Amazon Aurora storage is fault-tolerant, transparently handling the loss of up to two copies of data without affecting database write availability and up to three copies without affecting read availability. Amazon Aurora storage is also self-healing. Data blocks and disks are continuously scanned for errors and replaced automatically.

Increased Availability

You also benefit from enhanced database availability when running Multi-AZ deployments. If an Availability Zone failure or DB Instance failure occurs, your availability impact is limited to the time automatic failover takes to complete: typically under one minute for Amazon Aurora and one to two minutes for other database engines (see the RDS FAQ for details).

The availability benefits of MuIti-AZ deployments also extend to planned maintenance and backups. In the case of system upgrades like QS patching or DB Instance scaling, these operations are applied first on

the standby, prior to the automatic failover. As a result, your availability impact is, again, only the time required for automatic failover to complete.

Unlike Single-AZ deployments, 1/0 actMty is not suspended on your primary during backup for MuIti-AZ deployments for the MySQL, Oracle, and PostgreSQL engines, because the backup is taken from the standby. However, note that you may still experience elevated latencies for a few minutes during backups for MuIti-AZ deployments.

On instance failure in Amazon Aurora deployments, Amazon RDS uses RDS MuIti-AZ technology to automate failover to one of up to 15 Amazon Aurora Replicas you have created in any of three Availability Zones. If no Amazon Aurora Replicas have been provisioned, in the case of a failure, Amazon RDS will attempt to create a new Amazon Aurora DB instance for you automatically.


Q228. You are setting up some IAM user policies and have also become aware that some services support resource-based permissions, which let you attach policies to the service's resources instead of to IAM users or groups. Which of the below statements is true in regards to resource-level permissions?

A. All services support resource-level permissions for all actions.

B. Resource-level permissions are supported by Amazon CIoudFront

C. All services support resource-level permissions only for some actions.

D. Some services support resource-level permissions only for some actions. 

Answer: D

Explanation:

AWS Identity and Access Management is a web service that enables Amazon Web Services (AWS) customers to manage users and user permissions in AWS. The service is targeted at organizations with multiple users or systems that use AWS products such as Amazon EC2, Amazon RDS, and the AWS Management Console. With IAM, you can centrally manage users, security credentials such as access keys, and permissions that control which AWS resources users can access.

In addition to supporting IAM user policies, some services support resource-based permissions, which let you attach policies to the service's resources instead of to IAM users or groups. Resource-based permissions are supported by Amazon S3, Amazon SNS, and Amazon SQS.

The resource-level permissions service supports IAM policies in which you can specify indMdual resources using Amazon Resource Names (ARNs) in the poIicy's Resource element.

Some services support resource-level permissions only for some actions.

Reference: http://docs.aws.amazon.com/IAM/latest/UserGuide/Using_SpecificProducts.html


Q229. Read Replicas require a transactional storage engine and are only supported for the _ _ storage engine

A. OracIeISAM

B. MSSQLDB

C. InnoDB

D. IV|y|SAIV| 

Answer: C


Q230. True or False: When you perform a restore operation to a point in time or from a DB Snapshot, a new DB Instance is created with a new endpoint.

A. FALSE

B. TRUE

Answer: B



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