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 migrating on-premises workloads to AWS using AWS Direct Connect. The company has two Direct Connect connections from different providers for redundancy. Which configuration ensures seamless failover with automatic traffic rerouting?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create two Direct Connect gateways, each attached to a separate Transit Gateway, and advertise the same prefixes via BGP.
Option C is correct because using a Transit Gateway with two Direct Connect gateways (one for each connection) and dynamic BGP routing enables automatic failover via BGP path selection. Option A is wrong because both connections to the same VGW do not provide true redundancy if the VGW fails. Option B is wrong because static routes require manual intervention. Option D is wrong because a VPN over the internet defeats the purpose of Direct Connect.
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.
✓
Create two Direct Connect gateways, each attached to a separate Transit Gateway, and advertise the same prefixes via BGP.
Why this is correct
Enables automatic failover using BGP path selection.
Related concept
Static NAT maps one inside address to one outside address.
✗
Use one Direct Connect connection as primary and the other as standby with static routes.
Why it's wrong here
Static routes do not provide automatic failover.
✗
Connect both Direct Connect connections to the same Virtual Private Gateway (VGW) and enable BGP.
Why it's wrong here
Single point of failure at the VGW.
✗
Use a VPN connection over the internet as a backup for the Direct Connect links.
Why it's wrong here
Not a Direct Connect redundancy solution.
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.
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: Create two Direct Connect gateways, each attached to a separate Transit Gateway, and advertise the same prefixes via BGP. — Option C is correct because using a Transit Gateway with two Direct Connect gateways (one for each connection) and dynamic BGP routing enables automatic failover via BGP path selection. Option A is wrong because both connections to the same VGW do not provide true redundancy if the VGW fails. Option B is wrong because static routes require manual intervention. Option D is wrong because a VPN over the internet defeats the purpose of Direct Connect.
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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Question Discussion
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