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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Design Secure Architectures | 30% | - Design secure access to AWS resources
|
| Topic 2: Design Cost-Optimized Architectures | 20% | - Control and monitor costs
|
| Topic 3: Design High-Performing Architectures | 24% | - Design high-performance storage solutions
|
| Topic 4: Design Resilient Architectures | 26% | - Design decoupled and loosely coupled systems
|
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NEW QUESTION # 303
A popular augmented reality (AR) mobile game is heavily using a RESTful API which is hosted in AWS. The API uses Amazon API Gateway and a DynamoDB table with a preconfigured read and write capacity. Based on your systems monitoring, the DynamoDB table begins to throttle requests during high peak loads which causes the slow performance of the game.
Which of the following can you do to improve the performance of your app?
Answer: D
Explanation:
DynamoDB auto scaling uses the AWS Application Auto Scaling service to dynamically adjust provisioned throughput capacity on your behalf, in response to actual traffic patterns. This enables a table or a global secondary index to increase its provisioned read and write capacity to handle sudden increases in traffic, without throttling. When the workload decreases, Application Auto Scaling decreases the throughput so that you don't pay for unused provisioned capacity.
Using DynamoDB Auto Scaling is the best answer. DynamoDB Auto Scaling uses the AWS Application Auto Scaling service to dynamically adjust provisioned throughput capacity on your behalf.
Integrating an Application Load Balancer with your DynamoDB table is incorrect because an Application Load Balancer is not suitable to be used with DynamoDB and in addition, this will not increase the throughput of your DynamoDB table.
Adding the DynamoDB table to an Auto Scaling Group is incorrect because you usually put EC2 instances on an Auto Scaling Group, and not a DynamoDB table.
Creating an SQS queue in front of the DynamoDB table is incorrect because this is not a design principle for high throughput DynamoDB table. Using SQS is for handling queuing and polling the request. This will not increase the throughput of DynamoDB which is required in this situation.
Reference:
https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/AutoScaling.html Check out this Amazon DynamoDB Cheat Sheet: https://tutorialsdojo.com/amazon-dynamodb/ Amazon DynamoDB Overview:
https://www.youtube.com/watch?v=3ZOyUNIeorU
NEW QUESTION # 304
[Design Secure Architectures]
A company recently migrated its entire IT environment to the AWS Cloud. The company discovers that users are provisioning oversized Amazon EC2 instances and modifying security group rules without using the appropriate change control process A solutions architect must devise a strategy to track and audit these inventory and configuration changes.
Which actions should the solutions architect take to meet these requirements? (Select TWO )
Answer: B,C
Explanation:
A) Enable AWS CloudTrail and use it for auditing. AWS CloudTrail provides a record of API calls and can be used to audit changes made to EC2 instances and security groups. By analyzing CloudTrail logs, the solutions architect can track who provisioned oversized instances ormodified security groups without proper approval. D) Enable AWS Config and create rules for auditing and compliance purposes. AWS Config can record the configuration changes made to resources like EC2 instances and security groups. The solutions architect can create AWS Config rules to monitor for non-compliant changes, like launching certain instance types or opening security group ports without permission. AWS Config would alert on any violations of these rules.
NEW QUESTION # 305
A solutions architect needs to design a disaster recovery (DR) plan for an application on AWS. The application runs on Amazon EC2 instances behind an Application Load Balancer (ALB). The instances are in an Auto Scaling group. The application uses an Amazon Aurora PostgreSQL database. The recovery time objective (RTO) and recovery point objective (RPO) are 15 minutes each.
Which combination of steps should the solutions architect take to meet these requirements MOST cost- effectively? (Select TWO.)
Answer: B,E
Explanation:
Aurora Global Database uses storage-based replication to maintain a secondary Aurora cluster in another AWS Region with very low replication latency. During a Regional outage, the secondary cluster can be promoted, allowing the architecture to meet the required 15-minute RPO and RTO. For the application tier, deploying an Application Load Balancer and an Auto Scaling group with one running EC2 instance creates a cost-effective warm standby environment. During failover, the Auto Scaling group can rapidly increase capacity to support production traffic. Maintaining a complete duplicate of the primary application fleet would cost more than necessary. Exporting database backups would not provide sufficiently fast recovery or a sufficiently low recovery point. Creating the ALB and Auto Scaling group manually only after a disaster would also introduce excessive deployment and validation delays.
NEW QUESTION # 306
[Design Secure Architectures]
A company wants to design a microservices architecture for an application. Each microservice must perform operations that can be completed within 30 seconds.
The microservices need to expose RESTful APIs and must automatically scale in response to varying loads. The APIs must also provide client access control and rate limiting to maintain equitable usage and service availability.
Which solution will meet these requirements with the LEAST operational overhead?
Answer: A
NEW QUESTION # 307
A company has a web application hosted in their on-premises infrastructure that they want to migrate to AWS cloud. Your manager has instructed you to ensure that there is no downtime while the migration process is on-going. In order to achieve this, your team decided to divert 50% of the traffic to the new application in AWS and the other 50% to the application hosted in their on-premises infrastructure. Once the migration is over and the application works with no issues, a full diversion to AWS will be implemented. The company's VPC is connected to its on-premises network via an AWS Direct Connect connection.
Which of the following are the possible solutions that you can implement to satisfy the above requirement? (Select TWO.)
Answer: B,E
Explanation:
Application Load Balancers support Weighted Target Groups routing. With this feature, you will be able to do weighted routing of the traffic forwarded by a rule to multiple target groups. This enables various use cases like blue-green, canary and hybrid deployments without the need for multiple load balancers.
It even enables zero-downtime migration between on-premises and cloud or between different compute types like EC2 and Lambda.
To divert 50% of the traffic to the new application in AWS and the other 50% to the application, you can also use Route 53 with Weighted routing policy. This will divert the traffic between the on-premises and AWS-hosted application accordingly.
Weighted routing lets you associate multiple resources with a single domain name (tutorialsdojo.com) or subdomain name (portal.tutorialsdojo.com) and choose how much traffic is routed to each resource. This can be useful for a variety of purposes, including load balancing and testing new versions of software.
You can set a specific percentage of how much traffic will be allocated to the resource by specifying the weights.
For example, if you want to send a tiny portion of your traffic to one resource and the rest to another resource, you might specify weights of 1 and 255. The resource with a weight of 1 gets 1/256th of the traffic (1/1+255), and the other resource gets 255/256ths (255/1+255).
You can gradually change the balance by changing the weights. If you want to stop sending traffic to a resource, you can change the weight for that record to 0.
When you create a target group in your Application Load Balancer, you specify its target type. This determines the type of target you specify when registering with this target group. You can select the following target types:
1. instance - The targets are specified by instance ID.
2. ip - The targets are IP addresses.
3. Lambda - The target is a Lambda function.
When the target type is ip, you can specify IP addresses from one of the following CIDR blocks:
- 10.0.0.0/8 (RFC 1918)
- 100.64.0.0/10 (RFC 6598)
- 172.16.0.0/12 (RFC 1918)
- 192.168.0.0/16 (RFC 1918)
- The subnets of the VPC for the target group
These supported CIDR blocks enable you to register the following with a target group: ClassicLink instances, instances in a VPC that is peered to the load balancer VPC, AWS resources that are addressable by IP address and port (for example, databases), and on-premises resources linked to AWS through AWS Direct Connect or a VPN connection.
Take note that you can not specify publicly routable IP addresses. If you specify targets using an instance ID, traffic is routed to instances using the primary private IP address specified in the primary network interface for the instance. If you specify targets using IP addresses, you can route traffic to an instance using any private IP address from one or more network interfaces. This enables multiple applications on an instance to use the same port. Each network interface can have its own security group.
Hence, the correct answers are the following options:
- Use an Application Elastic Load balancer with Weighted Target Groups to divert and proportion the traffic between the on-premises and AWS-hosted application. Divert 50% of the traffic to the new application in AWS and the other 50% to the application hosted in their on-premises infrastructure.
- Use Route 53 with Weighted routing policy to divert the traffic between the on-premises and AWS- hosted application. Divert 50% of the traffic to the new application in AWS and the other 50% to the application hosted in their on-premises infrastructure.
The option that says: Use a Network Load balancer with Weighted Target Groups to divert the traffic between the on-premises and AWS-hosted application. Divert 50% of the traffic to the new application in AWS and the other 50% to the application hosted in their on-premises infrastructure is incorrect because a Network Load balancer doesn't have Weighted Target Groups to divert the traffic between the on- premises and AWS-hosted application.
The option that says: Use Route 53 with Failover routing policy to divert and proportion the traffic between the on-premises and AWS-hosted application. Divert 50% of the traffic to the new application in AWS and the other 50% to the application hosted in their on-premises infrastructure is incorrect because you cannot divert and proportion the traffic between the on-premises and AWS-hosted application using Route 53 with Failover routing policy. This is primarily used if you want to configure active-passive failover to your application architecture.
The option that says: Use AWS Global Accelerator to divert and proportion the HTTP and HTTPS traffic between the on-premises and AWS-hosted application. Ensure that the on-premises network has an AnyCast static IP address and is connected to your VPC via a Direct Connect Gateway is incorrect because although you can control the proportion of traffic directed to each endpoint using AWS Global Accelerator by assigning weights across the endpoints, it is still wrong to use a Direct Connect Gateway and an AnyCast IP address since these are not required at all. You can only associate static IP addresses provided by AWS Global Accelerator to regional AWS resources or endpoints, such as Network Load Balancers, Application Load Balancers, EC2 Instances, and Elastic IP addresses. Take note that a Direct Connect Gateway, per se, doesn't establish a connection from your on-premises network to your Amazon VPCs. It simply enables you to use your AWS Direct Connect connection to connect to two or more VPCs that are located in different AWS Regions. References:
http://docs.aws.amazon.com/Route53/latest/DeveloperGuide/routing-policy.html
https://aws.amazon.com/blogs/aws/new-application-load-balancer-simplifies-deployment-with-weighted-t arget-groups/
https://docs.aws.amazon.com/elasticloadbalancing/latest/application/load-balancer-target-groups.html Check out this Amazon Route 53 Cheat Sheet:
https://tutorialsdojo.com/amazon-route-53/
NEW QUESTION # 308
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