- A
Change the VPC CIDR to avoid overlap with on-premises.
Why wrong: Overlap is not the issue; routing decision is.
- B
Add specific routes for S3 public IP prefixes pointing to the internet gateway.
More specific routes override the general route to VGW, directing S3 traffic to IGW.
- C
Add a static route for 0.0.0.0/0 pointing to the internet gateway.
Why wrong: This sends all internet traffic via IGW, but on-premises traffic would also go to IGW, not Direct Connect.
- D
Add a static route in the VPC route table for 0.0.0.0/0 pointing to the VGW.
Why wrong: This sends all traffic including S3 through Direct Connect.
Question 229 of 1,705
ANS-C01 Route propagation Practice Question
This ANS-C01 practice question tests your understanding of network implementation. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. A key principle to apply: route propagation. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A company has a Direct Connect connection with a private VIF to a VPC. The VPC has a virtual private gateway (VGW) attached. The on-premises network advertises a prefix 10.0.0.0/8 over BGP. The VPC has subnets with CIDR 10.0.1.0/24 and 10.0.2.0/24. The company wants to ensure that traffic to on-premises uses Direct Connect. However, traffic to an S3 bucket uses the internet. What route configuration is required?
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 specific routes for S3 public IP prefixes pointing to the internet gateway.
Option B is correct because S3 public IP prefixes are not within the on-premises advertised prefix 10.0.0.0/8. Without explicit routes for S3, traffic to S3 would use the default route (if any) or be dropped. By adding specific routes for S3 public IP prefixes pointing to the internet gateway, S3 traffic is forced over the internet while all other traffic (including to on-premises) uses the Direct Connect private VIF via the propagated 10.0.0.0/8 route.
Key principle: Route propagation
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Change the VPC CIDR to avoid overlap with on-premises.
Why it's wrong here
Overlap is not the issue; routing decision is.
- ✓
Add specific routes for S3 public IP prefixes pointing to the internet gateway.
Why this is correct
More specific routes override the general route to VGW, directing S3 traffic to IGW.
Related concept
Route propagation
- ✗
Add a static route for 0.0.0.0/0 pointing to the internet gateway.
Why it's wrong here
This sends all internet traffic via IGW, but on-premises traffic would also go to IGW, not Direct Connect.
- ✗
Add a static route in the VPC route table for 0.0.0.0/0 pointing to the VGW.
Why it's wrong here
This sends all traffic including S3 through Direct Connect.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap is assuming that a default route (0.0.0.0/0) to the internet gateway is sufficient, but that would also send all non-matching traffic (e.g., to the internet) via IGW, which might be undesirable. The correct approach is to add specific routes for S3 public IP prefixes to the IGW, leaving the propagated 10.0.0.0/8 route for on-premises traffic.
Detailed technical explanation
How to think about this question
When a VPC has a virtual private gateway attached and BGP is used, the VPC route table automatically learns the prefixes advertised from on-premises (e.g., 10.0.0.0/8) as propagated routes. To override the default route for specific destinations like S3, you must add static routes with a higher specificity (e.g., /32 or /24 prefixes for S3 public IP ranges) pointing to the internet gateway, as static routes have a higher priority than propagated BGP routes. This is a common pattern for hybrid networking where you need to split traffic between Direct Connect and the internet based on destination.
KKey Concepts to Remember
- Route propagation
- Route priority
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Route propagation
Real-world example
How this comes up in practice
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
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 |
What to study next
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FAQ
Questions learners often ask
What does this ANS-C01 question test?
Network Implementation — This question tests Network Implementation — Route propagation.
What is the correct answer to this question?
The correct answer is: Add specific routes for S3 public IP prefixes pointing to the internet gateway. — Option B is correct because S3 public IP prefixes are not within the on-premises advertised prefix 10.0.0.0/8. Without explicit routes for S3, traffic to S3 would use the default route (if any) or be dropped. By adding specific routes for S3 public IP prefixes pointing to the internet gateway, S3 traffic is forced over the internet while all other traffic (including to on-premises) uses the Direct Connect private VIF via the propagated 10.0.0.0/8 route.
What should I do if I get this ANS-C01 question wrong?
Review route propagation, then practise related ANS-C01 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
Route propagation
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Last reviewed: Jul 4, 2026
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