The correct answer is to configure a Direct Connect gateway and attach a VPN to it, then advertise the same prefixes via BGP with lower priority on the VPN. This works because BGP’s path selection allows you to set a lower local preference or a longer AS path for the VPN routes, making the Direct Connect the primary path and the VPN a backup that activates automatically when the Direct Connect fails. On the AWS Certified Solutions Architect Professional SAP-C02 exam, this scenario tests your understanding of hybrid network resiliency and the interplay between Direct Connect and VPN failover using BGP attributes. A common trap is choosing a solution that adds latency or fails to provide automatic failover, such as relying on static routes or a second Direct Connect without BGP tuning. Memory tip: think “Direct Connect wins on priority, VPN waits in the wings” — the VPN is the backup, not the primary, so always lower its BGP preference.
SAP-C02 Continuous Improvement for Existing Solutions Practice Question
This SAP-C02 practice question tests your understanding of continuous improvement for existing solutions. 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 has a hybrid architecture with an AWS Direct Connect connection to its on-premises data center. The company wants to improve network availability and ensure that if the Direct Connect fails, traffic automatically uses a VPN backup. Which configuration should the company implement?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure a Direct Connect gateway and attach a VPN to it, then advertise the same prefixes via BGP with lower priority on the VPN.
Option B is correct because AWS VPN CloudHub provides a hub-and-spoke model for multiple VPN connections, but for failover, using BGP with Direct Connect and VPN as backup is standard. However, the best answer is to use a Direct Connect gateway with a VPN attachment for failover. Option A is wrong because it adds latency. Option C is wrong because it bypasses Direct Connect. Option D is wrong because it does not provide automatic 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.
✗
Use a NAT gateway to route traffic through the internet as a backup.
Why it's wrong here
NATgateway is for outbound traffic from private subnets, not hybrid connectivity.
✓
Configure a Direct Connect gateway and attach a VPN to it, then advertise the same prefixes via BGP with lower priority on the VPN.
Why this is correct
Allows automatic failover to VPN if Direct Connect fails.
Related concept
Static NAT maps one inside address to one outside address.
✗
Create a Site-to-Site VPN connection and update route tables to point all traffic to the VPN.
Why it's wrong here
Does not use Direct Connect; eliminates primary path.
✗
Set up a second Direct Connect connection from a different provider.
Why it's wrong here
Provides redundancy but at higher cost; not a VPN backup.
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 SAP-C02 NAT questions on configuration and troubleshooting.
Continuous Improvement for Existing Solutions — This question tests Continuous Improvement for Existing Solutions — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Configure a Direct Connect gateway and attach a VPN to it, then advertise the same prefixes via BGP with lower priority on the VPN. — Option B is correct because AWS VPN CloudHub provides a hub-and-spoke model for multiple VPN connections, but for failover, using BGP with Direct Connect and VPN as backup is standard. However, the best answer is to use a Direct Connect gateway with a VPN attachment for failover. Option A is wrong because it adds latency. Option C is wrong because it bypasses Direct Connect. Option D is wrong because it does not provide automatic failover.
What should I do if I get this SAP-C02 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 SAP-C02 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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