AWS Cheat Sheet 2026

The 30 highest-yield AWS facts, distilled from real exam questions. Print it, save it as a PDF, or study it here — free, no sign-up.

1. Which cloud design principle helps ensure fault tolerance and high availability? → Designing for failure with redundancy
2. Which Kinesis service is best suited for continuously delivering CloudWatch Logs subscription data to Amazon S3 and Amazon Redshift for analytics? → Amazon Kinesis Data Firehose (Data Firehose)
3. In AWS CodeBuild, which test report type natively integrates to display pass/fail results directly in the CodeBuild console? → JUnit XML and Cucumber JSON test reports
4. When using AWS SAM with the --capabilities CAPABILITY_IAM flag during deployment, what does this flag authorize? → Creation of IAM roles and policies by CloudFormation
5. In AWS CloudFormation, what is the purpose of a Change Set? → To preview proposed changes to a stack before executing the update
6. What is the maximum execution timeout for an AWS Lambda function? → 15 minutes
7. AWS D1.1 prohibits tack welds from being incorporated into final welds unless they: → Meet the WPS requirements and are visually accepted before being incorporated
8. Why is version control important in IaC? → To ensure transparency and rollback capabilities
9. What is the recommended technique for restarting a weld bead after an interruption to avoid a visible restart defect? → Start the arc 1 inch ahead of the crater and weld back into it before continuing forward
10. What AWS technology offers quick, simple, and secure file transfers between your client and your Amazon S3 bucket over long distances? → Amazon S3 Transfer Acceleration
11. Which type of fire extinguisher is appropriate for a welding-related electrical fire? → Class C (CO2 or dry chemical — non-conductive)
12. How does AWS IAM enhance security in cloud environments? → Manages user permissions and access policies
13. What is the most important professional competency for AWS DevOps certification in monitoring and logging? → Deep knowledge combined with practical application skills
14. Which SQS feature allows a consumer to retrieve up to 10 messages in a single API call, reducing the number of empty responses when the queue is sparse? → Long polling with WaitTimeSeconds up to 20
15. What is the default behavior of S3 Block Public Access for newly created buckets? → Public access is blocked
16. Which artifact store does AWS CodePipeline use by default to pass artifacts between stages? → Amazon S3 bucket created in the same region as the pipeline
17. What is the purpose of an Egress-Only Internet Gateway in AWS? → Allow IPv6 outbound traffic while blocking inbound IPv6 connections
18. What is the name of the service that enables server-free code execution? → AWS Lambda
19. Which service keeps track of all actions made through the AWS Management Console, AWS SDKs, command-line tools, and other AWS services? → AWS CloudTrail
20. Which destructive test evaluates the ductility and soundness of a weld by bending a specimen? → Guided bend test
21. During radiographic testing, scattered radiation is controlled primarily by using: → Lead intensifying screens and masking
22. What is the recommended method to test for gas leaks on an oxy-fuel system after setup? → Apply a leak-detection solution or soapy water to all fittings and observe for bubbles
23. What is the primary purpose of preheating before welding high-carbon steel? → Reduce the risk of hydrogen-induced cracking
24. What is a benefit of blue/green deployment? → It ensures zero downtime during deployment
25. Which AWS service enables you to run scripts on EC2 instances at launch to configure software or perform setup tasks? → EC2 User Data
26. Which control topology is used when both position and velocity feedback loops are active simultaneously in a servo system? → Cascaded (nested) control
27. How does the AWS DevOps body of knowledge relate to daily professional practice? → It provides the foundational framework that guides decision-making and standard practices
28. According to AWS safety standards, welding cable connections must be kept tight and inspected regularly primarily to prevent: → Resistance heating that can cause fire or equipment failure
29. What is the primary purpose of visual weld inspection? → Detect surface defects
30. In SAW, the interpass temperature limit specified in a WPS is critical primarily to: → Control heat input and maintain the required mechanical properties and HAZ characteristics