- A
Use a single connection with high bandwidth.
Why wrong: Single point of failure.
- B
Configure static routes to the on-premises network.
Why wrong: Static routes do not provide automatic failover; BGP is preferred.
- C
Use BGP to advertise the same prefixes over both connections.
Enables automatic failover.
- D
Use two or more Direct Connect connections.
Redundancy requires multiple connections.
- E
Connect to different Direct Connect locations.
Diverse paths avoid shared failure.
Question 495 of 1,705
Direct Connect High Availability: Three Key Design Considerations
This ANS-C01 practice question tests your understanding of network implementation. 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.
Which THREE of the following are considerations when designing a Direct Connect implementation for high availability? (Choose three.)
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
✓
Use BGP to advertise the same prefixes over both connections.
Option C is correct because using BGP to advertise the same prefixes over both Direct Connect connections enables active-active or active-passive load balancing and automatic failover. BGP’s route selection and AS_PATH prepending allow you to control traffic flow, ensuring that if one connection fails, the other continues to advertise the same prefixes, maintaining connectivity without manual intervention.
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.
- ✗
Use a single connection with high bandwidth.
Why it's wrong here
Single point of failure.
- ✗
Configure static routes to the on-premises network.
Why it's wrong here
Static routes do not provide automatic failover; BGP is preferred.
- ✓
Use BGP to advertise the same prefixes over both connections.
Why this is correct
Enables automatic failover.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Use two or more Direct Connect connections.
Why this is correct
Redundancy requires multiple connections.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Connect to different Direct Connect locations.
Why this is correct
Diverse paths avoid shared failure.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The ANS-C01 exam often tests the misconception that high bandwidth alone or static routes provide high availability, but the key is dynamic routing with BGP and redundant physical connections to separate locations.
Detailed technical explanation
How to think about this question
When using BGP over Direct Connect, you typically establish BGP sessions over each virtual interface (VLAN) and advertise the same prefixes (e.g., on-premises CIDR) from both connections. BGP’s MED, local preference, and AS_PATH attributes allow fine-grained traffic engineering; for example, you can prepend AS_PATH on one connection to make it less preferred for inbound traffic. In a real-world scenario, connecting to two different Direct Connect locations (Option E) ensures geographic redundancy, protecting against facility-level outages.
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 Implementation — This question tests Network Implementation — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use BGP to advertise the same prefixes over both connections. — Option C is correct because using BGP to advertise the same prefixes over both Direct Connect connections enables active-active or active-passive load balancing and automatic failover. BGP’s route selection and AS_PATH prepending allow you to control traffic flow, ensuring that if one connection fails, the other continues to advertise the same prefixes, maintaining connectivity without manual intervention.
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: Jul 4, 2026
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