- A
Prepend the AS path on the secondary connection's BGP advertisements
AS path prepending makes the secondary path less preferred; the primary will be used, and failover/failback occurs automatically.
- B
Set a higher MED value on the primary connection's BGP advertisements
Why wrong: MED is used to influence inbound traffic from multiple entry points, but AWS typically ignores MED from different ASes.
- C
Set a higher local preference on the secondary connection's BGP advertisements
Why wrong: Local preference is used to influence inbound traffic within an AS, not outbound to AWS.
- D
Use BGP communities to tag routes and manipulate preference on AWS side
Why wrong: BGP communities can influence routing policies but are not typically used for simple active/passive failover with automatic failback.
ANS-C01 Network Implementation Practice Question
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.
A company is designing a hybrid network architecture that requires high availability and low latency between its on-premises data center and AWS. They have two redundant 1 Gbps AWS Direct Connect connections. The company wants to use BGP to advertise the same prefix from both locations to AWS. How should they configure the BGP attributes to ensure active/passive failover with automatic failback?
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
Prepend the AS path on the secondary connection's BGP advertisements
Option B is correct because setting a shorter AS path prepend on the primary connection makes it preferred; if that path fails, the prepended path becomes active, and when the primary recovers, the shorter AS path is again preferred, providing automatic failback. Option A is wrong because local preference is applied inbound, not outbound. Option C is wrong because MED is not typically used across different AS. Option D is wrong because communities do not directly influence path selection for failover.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Prepend the AS path on the secondary connection's BGP advertisements
Why this is correct
AS path prepending makes the secondary path less preferred; the primary will be used, and failover/failback occurs automatically.
Related concept
Static NAT maps one inside address to one outside address.
- ✗
Set a higher MED value on the primary connection's BGP advertisements
Why it's wrong here
MED is used to influence inbound traffic from multiple entry points, but AWS typically ignores MED from different ASes.
- ✗
Set a higher local preference on the secondary connection's BGP advertisements
Why it's wrong here
Local preference is used to influence inbound traffic within an AS, not outbound to AWS.
- ✗
Use BGP communities to tag routes and manipulate preference on AWS side
Why it's wrong here
BGP communities can influence routing policies but are not typically used for simple active/passive failover with automatic failback.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
- Static NAT maps one inside address to one outside address.
- PAT allows many inside hosts to share one public address using ports.
- Inside local and inside global describe the private and translated addresses.
- NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
- Identify inside and outside interfaces first.
- Check whether the scenario needs static NAT, dynamic NAT or PAT.
- Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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
Got this wrong? Here's your next step.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related ANS-C01 NAT questions on configuration and troubleshooting.
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FAQ
Questions learners often ask
What does this ANS-C01 question test?
Network Implementation — This question tests Network Implementation — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Prepend the AS path on the secondary connection's BGP advertisements — Option B is correct because setting a shorter AS path prepend on the primary connection makes it preferred; if that path fails, the prepended path becomes active, and when the primary recovers, the shorter AS path is again preferred, providing automatic failback. Option A is wrong because local preference is applied inbound, not outbound. Option C is wrong because MED is not typically used across different AS. Option D is wrong because communities do not directly influence path selection for failover.
What should I do if I get this ANS-C01 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related ANS-C01 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 20, 2026
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.
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