SAP-C02 Continuous Improvement for Existing Solutions Practice Question
A company runs a production AWS environment with Amazon EC2 instances managed by Auto Scaling groups. The operations team notices that after a recent deployment, the application is returning higher error rates. Which TWO steps should the team take to enable a quick rollback and improve future deployments?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Implement canary deployments using AWS CodeDeploy to shift traffic gradually and monitor error rates.
Implement canary deployments using AWS CodeDeploy to shift traffic gradually and monitor error rates. This allows a gradual rollout, reducing blast radius, and enables quick rollback by stopping traffic to unhealthy instances. Option D: Use AWS Elastic Beanstalk to perform a blue/green deployment, swapping the environment URL after testing. This provides a full rollback by swapping back to the old environment. Option A (lifecycle hooks) is for custom actions during instance lifecycle, not for rollback of deployments. Option C (CloudFormation change sets) allows previewing changes but does not automatically roll back on failure. Option E (CloudTrail) is for auditing API calls, not for deployment rollback.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Configure Auto Scaling lifecycle hooks to automatically terminate new instances if health checks fail.
Why it's wrong here
Lifecycle hooks run custom actions but do not orchestrate rollback of deployments.
- ✓
Implement canary deployments using AWS CodeDeploy to shift traffic gradually and monitor error rates.
Why this is correct
Canary deployments allow early detection and rollback if errors increase.
- ✗
Use AWS CloudFormation change sets to automatically roll back failed deployments.
Why it's wrong here
Change sets preview changes but do not automatically roll back.
- ✓
Use AWS Elastic Beanstalk to perform a blue/green deployment, swapping the environment URL after testing.
Why this is correct
Blue/green deployment allows instant rollback by swapping back to the old environment.
- ✗
Enable AWS CloudTrail to track deployment API calls and automatically revert if errors exceed a threshold.
Why it's wrong here
CloudTrail is for logging, not automatic rollback.
Quick reference
AAA Protocol Comparison
| Protocol | Port(s) | Encryption | Transport | Primary Use |
|---|---|---|---|---|
| RADIUS | 1812 / 1813 | Password only | UDP | Network access control |
| TACACS+ | 49 | Full packet | TCP | Device administration |
| Diameter | 3868 | Full session | TCP / SCTP | Carrier / mobile networks |
| 802.1X | — | EAP-based | Layer 2 | Port-based access control |
TACACS+ encrypts the entire packet; RADIUS only encrypts the password field — a key exam distinction.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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