- A
The Transit Gateway route table associated with the Direct Connect gateway attachment has propagation enabled, which installs a more specific route for the production VPC CIDR directly to the production VPC attachment, bypassing the shared services VPC.
Propagation from the production VPC attachment installs a route for the production VPC CIDR pointing to the production VPC attachment, which is more specific than the 0.0.0.0/0 route to shared services. This causes traffic to bypass inspection.
- B
The shared services VPC has a default route pointing to the NAT gateway, which is not a valid next hop for traffic coming from the Transit Gateway.
Why wrong: The NAT gateway is for outbound traffic. For traffic from Transit Gateway to the internet, the shared services VPC needs a route to the internet gateway. But that is not related to inspection bypass.
- C
The production VPC route table has a default route pointing to the Transit Gateway, but the NAT gateway is in the shared services VPC, causing asymmetric routing.
Why wrong: The default route to Transit Gateway is correct for sending internet traffic to shared services. Asymmetric routing is not the issue here.
- D
The Transit Gateway route table associated with the shared services VPC attachment does not have a route for the production VPC CIDR pointing to the production VPC attachment, so return traffic cannot reach production.
Why wrong: While return traffic routing is important, the symptom is that inspection is bypassed, not that traffic fails. The return path may work via the default route or other routes.
ANS-C01 Network Design Practice Question
This ANS-C01 practice question tests your understanding of network design. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 financial services company is designing a hybrid network architecture using AWS Direct Connect. They have a Direct Connect connection with a public VIF and a private VIF. The private VIF is associated with a Direct Connect gateway that is attached to a Transit Gateway in us-east-1. The Transit Gateway has attachments to a production VPC and a shared services VPC. The company wants to ensure that all traffic from the on-premises network to the production VPC flows through a centralized inspection appliance in the shared services VPC for security compliance. Additionally, traffic from the production VPC to the internet must use a NAT gateway in the shared services VPC. The inspection appliance in the shared services VPC performs stateful inspection and must see both directions of traffic. The network engineer configured the following route tables: In the Transit Gateway route table associated with the Direct Connect gateway attachment, a static route for 0.0.0.0/0 points to the shared services VPC attachment. In the Transit Gateway route table associated with the production VPC attachment, a static route for the on-premises CIDR (10.0.0.0/8) points to the shared services VPC attachment. In the Transit Gateway route table associated with the shared services VPC attachment, a static route for the on-premises CIDR points to the Direct Connect gateway attachment, and a static route for 0.0.0.0/0 points to the Direct Connect gateway attachment (for outbound internet traffic, the shared services VPC has its own internet gateway and NAT gateway). The production VPC has a default route (0.0.0.0/0) pointing to the Transit Gateway. The shared services VPC has a default route pointing to the NAT gateway. However, traffic from on-premises to the production VPC is not being inspected; it goes directly to the production VPC. What is the most likely reason?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"most likely"Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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
The Transit Gateway route table associated with the Direct Connect gateway attachment has propagation enabled, which installs a more specific route for the production VPC CIDR directly to the production VPC attachment, bypassing the shared services VPC.
Option A is correct because when propagation is enabled on the Transit Gateway route table associated with the Direct Connect gateway attachment, the production VPC CIDR is automatically learned as a more specific route (e.g., 10.1.0.0/16) pointing directly to the production VPC attachment. This more specific route overrides the static 0.0.0.0/0 route that was intended to force traffic through the shared services VPC, causing on-premises traffic to bypass the inspection appliance.
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.
- ✓
The Transit Gateway route table associated with the Direct Connect gateway attachment has propagation enabled, which installs a more specific route for the production VPC CIDR directly to the production VPC attachment, bypassing the shared services VPC.
Why this is correct
Propagation from the production VPC attachment installs a route for the production VPC CIDR pointing to the production VPC attachment, which is more specific than the 0.0.0.0/0 route to shared services. This causes traffic to bypass inspection.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The shared services VPC has a default route pointing to the NAT gateway, which is not a valid next hop for traffic coming from the Transit Gateway.
- ✗
The production VPC route table has a default route pointing to the Transit Gateway, but the NAT gateway is in the shared services VPC, causing asymmetric routing.
Why it's wrong here
The default route to Transit Gateway is correct for sending internet traffic to shared services. Asymmetric routing is not the issue here.
- ✗
The Transit Gateway route table associated with the shared services VPC attachment does not have a route for the production VPC CIDR pointing to the production VPC attachment, so return traffic cannot reach production.
Why it's wrong here
While return traffic routing is important, the symptom is that inspection is bypassed, not that traffic fails. The return path may work via the default route or other routes.
Common exam traps
Common exam trap: answer the scenario, not the keyword
AWS often tests the misconception that static routes always take precedence over propagated routes in Transit Gateway route tables, but in reality, prefix length (specificity) determines priority, not whether the route is static or propagated.
Detailed technical explanation
How to think about this question
Transit Gateway route tables support both static routes and route propagation from VPC attachments. When propagation is enabled, the VPC's CIDR is automatically added as a route in the Transit Gateway route table, and because it is more specific than a static 0.0.0.0/0 route, it takes precedence. This behavior is similar to how BGP best-path selection works, where more specific prefixes are preferred. In real-world scenarios, this often catches engineers off guard when they assume static routes override propagated routes, but the rule is that the most specific prefix wins regardless of route origin.
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
A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
What to study next
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FAQ
Questions learners often ask
What does this ANS-C01 question test?
Network Design — This question tests Network Design — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The Transit Gateway route table associated with the Direct Connect gateway attachment has propagation enabled, which installs a more specific route for the production VPC CIDR directly to the production VPC attachment, bypassing the shared services VPC. — Option A is correct because when propagation is enabled on the Transit Gateway route table associated with the Direct Connect gateway attachment, the production VPC CIDR is automatically learned as a more specific route (e.g., 10.1.0.0/16) pointing directly to the production VPC attachment. This more specific route overrides the static 0.0.0.0/0 route that was intended to force traffic through the shared services VPC, causing on-premises traffic to bypass the inspection appliance.
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.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 30, 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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