hardMultiple ChoiceObjective-mapped
350-701 Practice Question: A security team notices that an AWS Lambda…
A security team notices that an AWS Lambda function is allowed to access an S3 bucket containing PII. The Lambda role has an attached policy that grants s3:PutObject and s3:GetObject to the bucket. Which action would be the most effective to ensure least privilege?
⚠ Common exam trap
Many exam-takers confuse resource-based policies (bucket policies) with identity-based policies (IAM roles) and think that modifying the IAM role alone is sufficient, but Cisco tests that least privilege requires restricting access at both the identity and resource levels, especially for cross-service scenarios.
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
✓
Add a bucket policy that restricts access to the Lambda execution role and includes conditions
Adding a bucket policy that restricts access to the Lambda execution role and includes conditions (such as aws:SourceArn or aws:SourceAccount) enforces least privilege at the resource level. This ensures that only the specific Lambda function can perform s3:PutObject and s3:GetObject on the S3 bucket, preventing any other principal or service from abusing the role's permissions.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Enable S3 default encryption using AWS KMS
Why it's wrong here
Encryption does not control access.
- ✗
Apply AWS WAF rules to the Lambda function
Why it's wrong here
WAF is for HTTP requests, not S3 access.
- ✗
Remove the role and create a new role with full S3 access
Why it's wrong here
Full access increases privilege, not least privilege.
- ✓
Add a bucket policy that restricts access to the Lambda execution role and includes conditions
Why this is correct
Resource policies with conditions can restrict based on role and source.
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 |
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 350-701 practice question is part of Courseiva's free Cisco 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 350-701 exam.