- A
Provision a single private virtual interface and use both connections for link aggregation.
Why wrong: A single VIF is a single point of failure.
- B
Provision two private virtual interfaces, one over each Direct Connect connection.
Separate VIFs provide redundancy at the virtual interface level.
- C
Configure static routes instead of BGP to simplify the design.
Why wrong: Static routes are less resilient and do not provide fast failover.
- D
Use the same BGP ASN for both connections.
Why wrong: Using the same ASN is allowed and does not affect redundancy, but it's not a step for high availability.
- E
Advertise the same prefixes from both connections with different BGP communities to influence traffic.
BGP communities help control path selection and failover behavior.
ANS-C01 Network Design Practice Question
This ANS-C01 practice question tests your understanding of network design. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 connecting its on-premises data center to AWS using AWS Direct Connect. The company has two Direct Connect connections and wants to ensure high availability. The on-premises network uses BGP to advertise routes to AWS. Which combination of steps should be taken to achieve the most resilient design? (Choose TWO.)
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
Provision two private virtual interfaces, one over each Direct Connect connection.
Option B is correct because provisioning two private virtual interfaces, one over each Direct Connect connection, ensures that if one connection or virtual interface fails, BGP can continue to route traffic over the other. This design provides redundancy at both the physical layer (connections) and the logical layer (virtual interfaces), which is essential for high availability.
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.
- ✗
Provision a single private virtual interface and use both connections for link aggregation.
Why it's wrong here
A single VIF is a single point of failure.
- ✓
Provision two private virtual interfaces, one over each Direct Connect connection.
Why this is correct
Separate VIFs provide redundancy at the virtual interface level.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Configure static routes instead of BGP to simplify the design.
Why it's wrong here
Static routes are less resilient and do not provide fast failover.
- ✗
Use the same BGP ASN for both connections.
Why it's wrong here
Using the same ASN is allowed and does not affect redundancy, but it's not a step for high availability.
- ✓
Advertise the same prefixes from both connections with different BGP communities to influence traffic.
Why this is correct
BGP communities help control path selection and failover behavior.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
AWS often tests the misconception that link aggregation (LAG) provides high availability, but in reality LAG is designed for bandwidth aggregation and does not offer redundancy; candidates may also incorrectly assume that using the same BGP ASN simplifies configuration, but it actually breaks the independent failover behavior required for resilience.
Detailed technical explanation
How to think about this question
In a resilient Direct Connect design, each private virtual interface operates as a separate BGP session, typically using different BGP ASNs (public or private) to allow independent route advertisement and failover. When the same prefixes are advertised from both connections with different BGP communities, you can influence traffic prioritization (e.g., using community values to set local preference) to control which connection is preferred for inbound traffic, while BGP's path selection handles outbound traffic automatically.
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
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
What to study next
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FAQ
Questions learners often ask
What does this ANS-C01 question test?
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: Provision two private virtual interfaces, one over each Direct Connect connection. — Option B is correct because provisioning two private virtual interfaces, one over each Direct Connect connection, ensures that if one connection or virtual interface fails, BGP can continue to route traffic over the other. This design provides redundancy at both the physical layer (connections) and the logical layer (virtual interfaces), which is essential for high availability.
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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Last reviewed: Jun 30, 2026
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