ANS-C01 Network Management and Operations Practice Question
A company has a Direct Connect connection with a public VIF to access AWS public services. The on-premises network team reports that they can reach S3 but not DynamoDB. The route table on the customer router shows a default route to the public VIF. What is the most likely cause?
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
✓
The on-premises firewall is blocking outbound traffic to the DynamoDB IP ranges.
DynamoDB uses a different set of public IP ranges than S3, and the on-premises firewall might block access to those ranges. Option A is wrong because the Direct Connect connection is a single physical link; if it were degraded, it would affect all traffic, not just DynamoDB. Option B is wrong because the public VIF does use BGP, but the customer router has a default route to the public VIF, indicating the BGP session is established and routes are being received. Option D is wrong because the public VIF accesses AWS public services directly, not through the VPC route table.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The Direct Connect connection is degraded and only supports S3 traffic.
Why it's wrong here
Bandwidth is shared; if connection works for S3, it should work for DynamoDB.
- ✗
The BGP session between the customer router and AWS is down.
Why it's wrong here
A public VIF uses BGP; if the BGP session were down, neither S3 nor DynamoDB would be reachable.
- ✓
The on-premises firewall is blocking outbound traffic to the DynamoDB IP ranges.
Why this is correct
Different AWS services have different IP ranges; firewall may block DynamoDB.
- ✗
The VPC route table does not have a route to the DynamoDB endpoint.
Why it's wrong here
Public VIF traffic does not go through the VPC.
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 ANS-C01 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 ANS-C01 exam.