A meteorological startup company has a custom web application to sell weather data to its users online. The company uses Amazon DynamoDB to store is data and wants to bu4d a new service that sends an alert to the managers of four Internal teams every time a new weather event is recorded. The company does not want true new service to affect the performance of the current application
What should a solutions architect do to meet these requirement with the LEAST amount of operational overhead?
A. Use DynamoDB transactions to write new event data to the table Configure the transactions to notify internal teams. B. Have the current application publish a message to four Amazon Simple Notification Service (Amazon SNS) topics. Have each team subscribe to one topic. C. Enable Amazon DynamoDB Streams on the table. Use triggers to write to a mingle Amazon Simple Notification Service (Amazon SNS) topic to which the teams can subscribe. D. Add a custom attribute to each record to flag new items. Write a cron job that scans the table every minute for items that are new and notifies an Amazon Simple Queue Service (Amazon SQS) queue to which the teams can subscribe.
C. Enable Amazon DynamoDB Streams on the table. Use triggers to write to a mingle Amazon Simple Notification Service (Amazon SNS) topic to which the teams can subscribe.
Explanation/Reference:
Question 832:
A company's production application runs online transaction processing (OLTP) transactions on an Amazon RDS MySQL DB instance The company is launching a new reporting tool that will access the same data The reporting tool must be highly available and not impact the performance of the production application.
How can this be achieved?
A. Create hourly snapshots of the production RDS DB instance B. Create a Multi-AZ RDS Read Replica of the production RDS DB instance C. Create multiple RDS Read Replicas of the production RDS DB instance Place the Read Replicas in an Auto Scaling group D. Create a Single-AZ RDS Read Replica of the production RDS DB instance Create a second Single-AZ RDS Read Replica from the replica
B. Create a Multi-AZ RDS Read Replica of the production RDS DB instance
Explanation/Reference:
Amazon RDS Read Replicas provide enhanced performance and durability for RDS database (DB) instances. They make it easy to elastically scale out beyond the capacity constraints of a single DB instance for read-heavy database workloads. You can create one or more replicas of a given source DB Instance and serve high-volume application read traffic from multiple copies of your data, thereby increasing aggregate read throughput. Read replicas can also be promoted when needed to become standalone DB instances. Read replicas are available in Amazon RDS for MySQL, MariaDB, PostgreSQL, Oracle, and SQL Server as well as Amazon Aurora. Amazon RDS Read Replicas Now Support Multi-AZ Deployments Amazon RDS Read Replicas enable you to create one or more read-only copies of your database instance within the same AWS Region or in a different AWS Region. Updates made to the source database are then asynchronously copied to your Read Replicas. In addition to providing scalability for read-heavy workloads, Read Replicas can be promoted to become a standalone database instance when needed. Amazon RDS Multi-AZ deployments provide enhanced availability for database instances within a single AWS Region. With Multi-AZ, your data is synchronously replicated to a standby in a different Availability Zone (AZ). In the event of an infrastructure failure, Amazon RDS performs an automatic failover to the standby, minimizing disruption to your applications. You can now use Read Replicas with Multi-AZ as part of a disaster recovery (DR) strategy for your production databases. A well-designed and tested DR plan is critical for maintaining business continuity after a disaster. A Read Replica in a different region than the source database can be used as a standby database and promoted to become the new production database in case of a regional disruption.
A company that recently started using AWS establishes a Site-to-Site VPN between its on-premises data center and AWS. The company's security mandate states that traffic originating from on premises should stay within the company's
private IP space when communicating with an Amazon Elastic Container Service (Amazon ECS) cluster that is hosting a sample web application.
Which solution meets this requirement?
A. Configure a gateway endpoint for Amazon ECS. Modify the route table to include an entry pointing to the ECS cluster. B. Create a Network Load Balancer and AWS PrivateLink endpoint for Amazon ECS in the same VPC that is hosting the ECS cluster. C. Create a Network Load Balancer in one VPC and an AWS PrivateLink endpoint for Amazon ECS in another VPC. Connect the two VPCs by using VPC peering. D. Configure an Amazon Route 53 record with Amazon ECS as the target. Apply a server certificate to Route 53 from AWS Certificate Manager (ACM) for SSL offloading.
A. Configure a gateway endpoint for Amazon ECS. Modify the route table to include an entry pointing to the ECS cluster.
Explanation/Reference:
Question 834:
a website on Amazon S3. The website serves petabytes of outbound traffic monthly, which accounts for most of the company's AWS costs. What should a solutions architect do to reduce costs?
A. Configure Amazon CloudFront with the existing website as the origin. B. Move the website to Amazon EC2 with Amazon EBS volumes for storage. C. Use AWS Global Accelerator and specify the existing website as the endpoint. D. Rearchitect the website to run on a combination of Amazon API Gateway and AWS Lambda.
A. Configure Amazon CloudFront with the existing website as the origin.
Question 835:
The DNS provider that hosts a company's domain name records is experiencing outages that cause service disruption for a website running on AWS The company needs to migrate to a more resilient managed DNS service and wants the service to run on AWS.
What should a solutions architect do to rapidly migrate the DNS hosting service?
A. Create an Amazon Route 53 public hosted zone for the domain name. Import the zone file containing the domain records hosted by the previous provider. B. Create an Amazon Route 53 private hosted zone for the domain name Import the zone file containing the domain records hosted by the previous provider C. Create a Simple AD directory in AWS. Enable zone transfer between the DNS provider and AWS Directory Service for Microsoft Active Directory for the domain records. D. Create an Amazon Route 53 Resolver inbound endpoint in the VPC Specify the IP addresses that the provider's DNS will forward DNS queries to Configure the provider's DNS to forward DNS queries for the domain to the IP addresses that are specified in the inbound endpoint.
B. Create an Amazon Route 53 private hosted zone for the domain name Import the zone file containing the domain records hosted by the previous provider
Explanation/Reference:
Question 836:
An application is running on an Amazon EC2 instance and must have millisecond latency when running the workload. The application makes many small reads and writes to the file system, but the file system itself is small. Which Amazon Elastic Block Store (Amazon EBS) volume type should a solutions architect attach to their EC2 instance?
A. Cold HDD (sc1) B. General Purpose SSD (gp2) C. Provisioned IOPS SSD (io1) D. Throughput Optimized HDD (st1)
A company is moving Its on-premises Oracle database to Amazon Aurora PostgreSQL. The database has several applications that write to the same tables. The applications need to be migrated one by one with a month in between each
migration Management has expressed concerns that the database has a high number of reads and writes. The data must be kept in sync across both databases throughout tie migration.
What should a solutions architect recommend?
A. Use AWS DataSync tor the initial migration. Use AWS Database Migration Service (AWS DMS] to create a change data capture (CDC) replication task and a table mapping to select all cables. B. UseAVVS DataSync for the initial migration. Use AWS Database Migration Service (AWS DMS) to create a full load plus change data capture (CDC) replication task and a table mapping to select ail tables. C. Use the AWS Schema Conversion led with AWS DataBase Migration Service (AWS DMS) using a memory optimized replication instance Create a tui load plus change data capture (CDC) replication task and a table mapping lo select all tables. D. Use the AWS Schema Conversion Tool with AWS Database Migration Service (AWS DMS) using a compute optimized implication instance Create a full load plus change data capture (CDC) replication task and a table mapping to select the largest tables.
C. Use the AWS Schema Conversion led with AWS DataBase Migration Service (AWS DMS) using a memory optimized replication instance Create a tui load plus change data capture (CDC) replication task and a table mapping lo select all tables.
Explanation/Reference:
Between memory (answer C) and compute (answer D) i prefer the memory because i found this:
"As you can see, we have three important memory buffers in this architecture for CDC in AWS DMS. If any of these buffers experience memory pressure, the migration can have performance issues that can potentially cause failures."
A company is hosting its static website in an Amazon S3 bucket, which is the origin for Amazon CioudFront. The company has users in the United States. Canada, and Europe and wants to reduce costs. What should a solutions architect recommend?
A. Adjust the CloudFront caching time to live (TTL) from the default to a longer timeframe. B. Implement CloudFront events with Lambda@Edge to run the website's data processing. C. Modify the CloudFront price class to include only the locations of the countries that are served. D. Implement a CloudFront Secure Sockets Layer (SSL) certificate to push security closer to the locations of the countries that are served.
C. Modify the CloudFront price class to include only the locations of the countries that are served.
Explanation/Reference:
A. This could be an option, since static content won't change that much.
B. It's a static website, there is no processing.
D. What does an SSL have to do with reducing costs?
CloudFront edge locations are grouped into geographic regions, and we've grouped regions into price classes. The default price class includes all regions. Another price class includes most regions (the United States; Canada; Europe; Hong Kong, Philippines, South Korea, Taiwan, and Singapore; Japan; India; South Africa; and Middle East regions) but excludes the most expensive regions. A third price class includes only the least expensive regions (the United States, Canada, and Europe regions).
A company running an on-premises application is migrating the application to AWS to increase its elasticity and availability. The current architecture uses a Microsoft SQL Server database with heavy read activity. The company wants to explore alternate database options and migrate database engines, if needed. Every 4 hours, the development team does a full copy of the production database to populate a test database. During this period, users experience latency. What should a solution architect recommend as replacement database?
A. Use Amazon Aurora with Multi-AZ Aurora Replicas and restore from mysqldump for the test database. B. Use Amazon Aurora with Multi-AZ Aurora Replicas and restore snapshots from Amazon RDS for the test database. C. Use Amazon RDS for MySQL with a Multi-AZ deployment and read replicas, and use the standby instance for the test database. D. Use Amazon RDS for SQL Server with a Multi-AZ deployment and read replicas, and restore snapshots from RDS for the test database.
D. Use Amazon RDS for SQL Server with a Multi-AZ deployment and read replicas, and restore snapshots from RDS for the test database.
Question 840:
A company has a web server running on an Amazon EC2 instance in a public subnet with an Elastic IP address The default security group is assigned to the EC2 instance. The default network ACL has been modified to block all traffic. A solutions architect needs to make the web server accessible from everywhere on port 443 Which combination of steps will accomplish this task? (Select TWO.)
A. Create a security group with a rule to allow TCP port 443 from source 0.0.0.0/0. B. Create a security group with a rule to allow TCP port 443 to destination 0 0 0 0/0. C. Update the network ACL to allow TCP port 443 from source 0.0 0 0/0. D. Update the network ACL to allow inbound/outbound TCP port 443 from source 0.0.0.0/0 and to destination 0.0.0.0/0. E. Update the network ACL to allow inbound TCP port 443 from source 0.0.0 0/0 and outbound TCP port 32768-65535 to destination 0 0 0.0/0
A. Create a security group with a rule to allow TCP port 443 from source 0.0.0.0/0. E. Update the network ACL to allow inbound TCP port 443 from source 0.0.0 0/0 and outbound TCP port 32768-65535 to destination 0 0 0.0/0
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