AWS Well-Architected Framework and Design Principles — Questions and Answers
Question 1: The AWS Well-Architected Framework is organized around six pillars. Which pillar focuses on the ability of a system to recover from failures and dynamically acquire computing resources to meet demand?
- Performance Efficiency
- Operational Excellence
- Reliability (Correct answer)
- Cost Optimization
Correct answer: Reliability
The Reliability pillar focuses on workloads that perform their intended function correctly and consistently, including the ability to recover from infrastructure or service disruptions, dynamically acquire computing resources to meet demand, and mitigate disruptions from misconfigurations or transient network issues.
Question 2: According to AWS Well-Architected best practices, what does 'design for failure' mean?
- Accepting that cloud systems will inevitably fail and budgeting for recovery costs
- Architecting systems with the assumption that components will fail, so failures have no impact on users (Correct answer)
- Designing systems that fail fast and shut down to prevent data corruption
- Using AWS Support plans to ensure AWS fixes failures on your behalf
Correct answer: Architecting systems with the assumption that components will fail, so failures have no impact on users
'Design for failure' means assuming every component—servers, disks, network links—will eventually fail, and building redundancy, auto-recovery, and graceful degradation so that individual component failures do not affect end users. This leads to patterns like multi-AZ deployments, Auto Scaling, and health-check-based failover.
Question 3: Which AWS Well-Architected pillar includes design principles such as 'eliminate idle resources,' 'use managed and serverless services,' and 'match supply to demand'?
- Reliability
- Performance Efficiency
- Sustainability
- Cost Optimization (Correct answer)
Correct answer: Cost Optimization
The Cost Optimization pillar focuses on avoiding unnecessary costs, right-sizing resources, using reserved capacity, and turning off idle resources. Principles like matching supply to demand (via Auto Scaling) and using managed services (to avoid over-provisioning) are central to this pillar.
Question 4: A Solutions Architect recommends deploying an application across three Availability Zones with an Application Load Balancer. Which Well-Architected pillar does this primarily address?
- Cost Optimization
- Security
- Reliability (Correct answer)
- Operational Excellence
Correct answer: Reliability
Spreading workloads across multiple Availability Zones ensures the application remains available if one AZ experiences an outage. This directly addresses the Reliability pillar, which emphasizes fault isolation, redundancy, and automatic recovery from failures.
Question 5: The AWS Well-Architected Tool helps you review your workloads against AWS best practices. What format does it use to gather information about your architecture?
- Automated scans of your AWS account resources
- A set of questions across each of the six pillars that you answer about your workload (Correct answer)
- Benchmarking your workload against anonymized industry peers
- Integration with AWS Trusted Advisor to generate a report
Correct answer: A set of questions across each of the six pillars that you answer about your workload
The AWS Well-Architected Tool presents a structured questionnaire organized by the six pillars. You answer questions about your workload's design decisions, and the tool identifies high-risk issues (HRIs) and provides improvement recommendations. It does not automatically scan your account configuration.
Question 6: Which principle, core to the Operational Excellence pillar of the AWS Well-Architected Framework, recommends making small, reversible changes rather than large, infrequent deployments?
- Perform operations as code
- Make frequent, small, reversible changes (Correct answer)
- Refine operations procedures frequently
- Anticipate failure
Correct answer: Make frequent, small, reversible changes
The Operational Excellence pillar design principle 'Make frequent, small, reversible changes' reduces the blast radius of any individual change. Small changes are easier to test, deploy, and roll back if something goes wrong, compared to large infrequent deployments that are harder to troubleshoot.
AWS Well-Architected Framework and Design Principles
The AWS Well-Architected Framework is organized around six pillars.
Which pillar focuses on the ability of a system to recover from failures and dynamically acquire computing resources to meet demand?