SAP-C02 Continuous Improvement for Existing Solutions Practice Question
A company is using AWS Lambda functions to process files uploaded to an S3 bucket. Recently, the processing time has increased significantly. A solutions architect notices that the Lambda functions are using the default VPC configuration. What is the MOST likely cause of the performance degradation?
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
✓
Lambda function is attached to a VPC, causing network latency for S3 API calls.
Lambda functions in a VPC use an Elastic Network Interface (ENI) in a private subnet, which can add latency for internet-bound requests. Options A, C, and D do not directly cause increased processing time.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Lambda function is using too much memory.
Why it's wrong here
Memory affects CPU, not network latency.
- ✓
Lambda function is attached to a VPC, causing network latency for S3 API calls.
Why this is correct
Lambda in a VPC uses ENIs and routes through NAT for internet access, adding latency.
- ✗
S3 bucket has versioning enabled, causing extra overhead.
Why it's wrong here
Versioning does not significantly impact processing time.
- ✗
S3 bucket is in a different region.
Why it's wrong here
Cross-region S3 access adds latency, but the question does not mention region mismatch.
Visual reference
Quick reference
AWS S3 Storage Class Comparison
| Storage Class | Min Duration | Retrieval | Use Case |
|---|---|---|---|
| S3 Standard | None | Immediate | Frequently accessed data |
| S3 Standard-IA | 30 days | Immediate | Infrequent access, rapid retrieval |
| S3 One Zone-IA | 30 days | Immediate | Non-critical infrequent data |
| S3 Intelligent-Tiering | None | Immediate–hours | Unknown or changing access patterns |
| S3 Glacier Instant | 90 days | Milliseconds | Archive with instant retrieval |
| S3 Glacier Flexible | 90 days | Minutes–hours | Archive, flexible retrieval |
| S3 Glacier Deep Archive | 180 days | Hours | Long-term compliance archive |
Go deeper
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This SAP-C02 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the SAP-C02 exam.