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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Deployment | 24% | - Implement CI/CD pipelines
|
| Topic 2: Troubleshooting and Optimization | 18% | - Optimize application performance
|
| Topic 3: Development with AWS Services | 32% | - Integrate AWS services into applications
|
| Topic 4: Security | 26% | - Implement authentication and authorization
|
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NEW QUESTION # 622
A company has deployed an application on AWS Elastic Beanstalk. The company has configured the Auto Scaling group that is associated with the Elastic Beanstalk environment to have five Amazon EC2 instances.
If the capacity is fewer than four EC2 instances during the deployment, application performance degrades.
The company is using the all-at-once deployment policy.
What is the MOST cost-effective way to solve the deployment issue?
Answer: D
Explanation:
Explanation
This solution will solve the deployment issue by deploying the new version of the application to one new EC2 instance at a time, while keeping the old version running on the existing instances. This way, there will always be at least four instances serving traffic during the deployment, and no downtime or performance degradation will occur. Option A is not optimal because it will increase the cost of running the Elastic Beanstalk environment without solving the deployment issue. Option B is not optimal because it will split the traffic between two versions of the application, which may cause inconsistency and confusion for the customers. Option D is not optimal because it will deploy the new version of the application to two existing instances at a time, which may reduce the capacity below four instances during the deployment.
References: AWS Elastic Beanstalk Deployment Policies
NEW QUESTION # 623
A company has an application that consists of different microservices that run inside an AWS account.
The microservices are running in containers inside a single VPC. The number of microservices is constantly increasing. A developer must create a central logging solution for application logs.
Answer: D
NEW QUESTION # 624
A company runs a serverless application that uses several AWS Lambda functions. The existing Lambda functions run in a VPC. The Lambda functions query public APIs successfully.
To add a new feature to the application, a developer creates a new Lambda function to query external public APIs. The new Lambda function must store aggregated results in an Amazon RDS database that is in a private subnet of the VPC. The developer configures VPC access for the new Lambda function and sets up a working connection to the RDS database. The requests that the new Lambda function makes to the external APIs fail.
However, requests from the developer's local workstation to the same APIs are successful.
Which solution will meet this requirement?
Answer: C
Explanation:
When a Lambda function is configured to run inside a VPC, it receives ENIs in the selected subnets and uses those subnets' routing to reach other networks. If the function is placed in private subnets (common when it needs to access an RDS database in private subnets), it typically does not have a direct route to the internet.
As a result, outbound calls to public external APIs will fail unless the VPC provides a controlled egress path.
The standard AWS networking pattern for private-subnet internet access is a NAT gateway (or NAT instance) deployed in a public subnet, with a route from the private subnet(s) to the NAT gateway (0.0.0.0/0
# NAT). The NAT gateway then uses an internet gateway attached to the VPC to reach the public internet while keeping the Lambda function (and the RDS database) in private address space. This resolves the connectivity issue while maintaining the security posture of private subnets.
Option A is not the solution: Lambda automatically provisions ENIs for VPC-enabled functions; manually provisioning an ENI does not provide internet access. Option C (security group outbound rules) is necessary but not sufficient-security groups control allowed traffic, but without a proper route to the internet (via NAT), the packets still cannot reach external endpoints. Option D (gateway VPC endpoint) is for AWS services like S3 and DynamoDB (gateway endpoints), not for arbitrary public internet APIs, and "in a public subnet" is not how gateway endpoints are used; they are associated with route tables.
Therefore, the correct solution is B: add a NAT gateway in a public subnet and update private subnet route tables so the new Lambda function can reach external public APIs while still accessing the private RDS database.
NEW QUESTION # 625
A developer is incorporating AWS X-Ray into an application that handles personal identifiable information (PII). The application is hosted on Amazon EC2 instances. The application trace messages include encrypted PII and go to Amazon CloudWatch. The developer needs to ensure that no PII goes outside of the EC2 instances.
Which solution will meet these requirements?
Answer: B
Explanation:
Not to send any PII to AWS X-Ray service, add instrumentation code in your application at each location to send trace information that PII is eliminated.
https://docs.aws.amazon.com/xray/latest/devguide/xray-instrumenting-your-app.html
NEW QUESTION # 626
A real-time messaging application uses Amazon API Gateway WebSocket APIs with backend HTTP service.
A developer needs to build a feature in the application to identify a client that keeps connecting to and disconnecting from the WebSocket connection. The developer also needs the ability to remove the client Which combination of changes should the developer make to the application to meet these requirements?
(Select TWO.)
Answer: C,E
Explanation:
Requirement Summary:
* WebSocket-based messaging app usingAPI Gateway WebSocket APIs
* Need to:
* Identify clients repeatedlyconnecting/disconnecting
* Be able toremoveproblematic clients
Evaluate Options:
A: Switch to HTTP APIs
* #HTTP APIs don't supportWebSocketconnections
B: Switch to REST APIs
* #REST APIs arenot compatiblewith WebSockets
#C. Use the callback URL to disconnect clients
* ##Possible, butnot a direct option
* Callback URLs are used forsending messages to connected clients, not for disconnecting
#D. Track client status in ElastiCache
* #Good solution: Store and update connection state (connected, disconnected, timestamps)
* Helpstrack abuse or reconnections
#E. Implement $connect and $disconnect routes
* #Required to captureconnection lifecycle events
* These can be used to log/store client behavior and decide on removal
* WebSocket routes in API Gateway: https://docs.aws.amazon.com/apigateway/latest/developerguide/apigateway-websocket-api-route-selection.html
* Managing WebSocket connections: https://docs.aws.amazon.com/apigateway/latest/developerguide/apigateway-websocket-api-mapping-template-reference.html
NEW QUESTION # 627
......
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