Amazon Web Services Updated CLF-C02 Exam Questions and Answers by nadia

Amazon Athena Overview:

Amazon Athena is a serverless query service that allows users to analyze data in S3 using standard SQL.

It is commonly used to query AWS Cost and Usage Reports stored in S3.

How It Works for Cost Reports:

Cost and Usage Reports are delivered in a structured format to an S3 bucket.

Athena can query these reports without requiring additional ETL processes.

Why Other Options Are Incorrect:

A. Amazon OpenSearch Service:Designed for search and log analytics, not querying structured data.

C. Amazon Aurora:A relational database service, unsuitable for querying S3 data directly.

D. AWS Glue:Used for ETL tasks but not directly for querying.

A VPC network access control list, commonly called a network ACL or NACL, provides stateless packet filtering at the subnet boundary. Because it is stateless, it does not remember previously allowed connections. Rules must explicitly allow the required inbound traffic and the corresponding outbound response traffic. Therefore, option C is correct. Security groups are stateful virtual firewalls applied to resources through their network interfaces. When a security group allows traffic in one direction, response traffic for that connection is automatically permitted, regardless of an explicit return rule. AWS PrivateLink provides private connectivity between VPCs, AWS services, and endpoint services without requiring traffic to traverse the public internet; it is not primarily a stateless filtering mechanism. AWS WAF filters web requests to protected application resources based on application-layer criteria such as IP addresses, headers, paths, and malicious-request patterns. It is not a subnet-level stateless VPC packet filter. For the exam, remember that security groups are stateful and normally control resource-level traffic, while network ACLs are stateless and apply inbound and outbound rules at the subnet level.

Amazon EventBridge Overview:

EventBridge is a serverless event bus that enables applications to react to changes in AWS resources.

It supports routing events such as EC2 state changes to various targets, including AWS Step Functions.

How EventBridge Meets the Requirement:

EventBridge can capture the EC2 instance state change event and trigger the execution of a Step Functions workflow.

The integration is seamless and supports workflows triggered by multiple event sources.

Why Other Options Are Incorrect:

A. Amazon SageMaker:Used for building, training, and deploying machine learning models; not related to event triggers.

B. Amazon Connect:A cloud-based contact center service; unrelated to event triggers.

D. AWS Fargate:A compute engine for containers; does not manage events or invoke workflows.