Quick Answer
The static route to on-premises is the correct choice because in an AWS Transit Gateway route table, static routes always take precedence over propagated routes, regardless of the source or prefix length. This is a fundamental rule of TGW route evaluation: when a static route and a propagated route share the same destination prefix, the static route is selected for forwarding traffic, and propagated routes are only considered if no static match exists. On the AWS Certified Advanced Networking Specialty ANS-C01 exam, this concept tests your understanding of TGW route table behavior, often appearing in hybrid networking scenarios where overlapping prefixes from Direct Connect and VPC attachments create ambiguity. A common trap is assuming AS_PATH length or longest prefix match applies, but TGW does not use BGP attributes for static versus propagated decisions. Remember the memory tip: “Static sticks, propagated plays second fiddle”—static routes are always the primary choice when a direct match exists.
This ANS-C01 practice question tests your understanding of network implementation. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 VPC with a transit gateway (TGW) connected to multiple VPCs and an on-premises network via AWS Direct Connect. The on-premises network advertises a specific prefix 10.0.0.0/16. A VPC attachment in the same region also advertises the same prefix. The TGW route table has the on-premises route as static and the VPC route as propagated. Which route will be used for traffic destined to 10.0.0.5?
The propagated route from VPC
Why wrong: Propagated routes have lower precedence.
The static route to on-premises
Static routes have higher precedence than propagated.
Both routes will be used with ECMP
Why wrong: ECMP not used between static and propagated.
The route with the shortest AS_PATH
Why wrong: AS_PATH is not considered for static routes.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
The static route to on-premises
Option A is correct because static routes take precedence over propagated routes in a transit gateway route table. Option B is wrong because TGW does not use AS_PATH for static vs propagated. Option C is wrong because there is no longest prefix match difference. Option D is wrong because equal-cost multipath is not applied when static and propagated routes exist.
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
For each option: why learners choose it and why it is or isn't the right answer here.
The propagated route from VPC
Why it's wrong here
Propagated routes have lower precedence.
The static route to on-premises
Why this is correct
Static routes have higher precedence than propagated.
Related concept
Static NAT maps one inside address to one outside address.
Both routes will be used with ECMP
Why it's wrong here
ECMP not used between static and propagated.
The route with the shortest AS_PATH
Why it's wrong here
AS_PATH is not considered for static routes.
Common exam traps
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
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.
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
A startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
What to study next
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
Network Implementation — This question tests Network Implementation — Static NAT maps one inside address to one outside address..
The correct answer is: The static route to on-premises — Option A is correct because static routes take precedence over propagated routes in a transit gateway route table. Option B is wrong because TGW does not use AS_PATH for static vs propagated. Option C is wrong because there is no longest prefix match difference. Option D is wrong because equal-cost multipath is not applied when static and propagated routes exist.
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.
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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