This ANS-C01 practice question tests your understanding of network design. 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. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. 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 is designing a hybrid network with an AWS Direct Connect connection. They have two virtual interfaces (VIFs): a private VIF to a VPC and a public VIF to access AWS public services. They want to ensure that traffic to Amazon S3 in the same region uses the Direct Connect connection and not the internet. Which configuration should be applied?
Advertise the S3 prefix via BGP on the public VIF and ensure the VPC route table has a more specific route for S3 pointing to the virtual private gateway.
This directs S3 traffic over Direct Connect.
B
Add a route in the VPC route table for S3 prefix with target as the internet gateway.
Why wrong: This would send traffic over the internet.
C
Create a VPC endpoint for S3 and attach it to the VPC route table.
Why wrong: VPC endpoints use private IPs, not the public VIF.
D
Create a VPN connection to the VPC and route S3 traffic through the VPN.
Why wrong: VPN adds complexity and cost; Direct Connect is preferred.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Advertise the S3 prefix via BGP on the public VIF and ensure the VPC route table has a more specific route for S3 pointing to the virtual private gateway.
To force traffic to Amazon S3 in the same region over the Direct Connect public VIF, you must advertise the S3 prefix (e.g., 52.216.0.0/15) via BGP on the public VIF. This makes the Direct Connect path the most specific route for S3 in the VPC route table when combined with a more specific route pointing to the virtual private gateway, overriding the default internet route.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Advertise the S3 prefix via BGP on the public VIF and ensure the VPC route table has a more specific route for S3 pointing to the virtual private gateway.
Why this is correct
This directs S3 traffic over Direct Connect.
Related concept
Read the scenario before looking for a memorised answer.
✗
Add a route in the VPC route table for S3 prefix with target as the internet gateway.
Why it's wrong here
This would send traffic over the internet.
✗
Create a VPC endpoint for S3 and attach it to the VPC route table.
Why it's wrong here
VPC endpoints use private IPs, not the public VIF.
✗
Create a VPN connection to the VPC and route S3 traffic through the VPN.
Why it's wrong here
VPN adds complexity and cost; Direct Connect is preferred.
Common exam traps
Common exam trap: answer the scenario, not the keyword
AWS often tests the misconception that a VPC endpoint for S3 is the correct way to route S3 traffic over Direct Connect, but a VPC endpoint does not use the Direct Connect public VIF; it uses private connectivity within AWS, so it cannot force traffic over the Direct Connect connection when a public VIF is already in place.
Detailed technical explanation
How to think about this question
The public VIF on a Direct Connect connection allows BGP peering with AWS public endpoints, enabling you to advertise specific public IP prefixes (like S3) to your on-premises router. In the VPC route table, a more specific route (e.g., /15 for S3) pointing to the virtual private gateway overrides the default route (0.0.0.0/0) to the internet gateway, ensuring traffic for S3 uses the Direct Connect path. This approach works because BGP on the public VIF exchanges routes for AWS public services, and the VPC route table can be statically configured with a more specific prefix to direct traffic to the virtual private gateway, which then forwards it over the Direct Connect public VIF.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
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
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Network Design — This question tests Network Design — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Advertise the S3 prefix via BGP on the public VIF and ensure the VPC route table has a more specific route for S3 pointing to the virtual private gateway. — To force traffic to Amazon S3 in the same region over the Direct Connect public VIF, you must advertise the S3 prefix (e.g., 52.216.0.0/15) via BGP on the public VIF. This makes the Direct Connect path the most specific route for S3 in the VPC route table when combined with a more specific route pointing to the virtual private gateway, overriding the default internet route.
What should I do if I get this ANS-C01 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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