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Question 198 of 1,705

Network Implementation →hardMultiple ChoiceObjective-mapped

Enable Route Propagation on VPC Route Table for Direct Connect via VGW

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 has a Direct Connect connection with a private VIF to a Direct Connect gateway. The VIF is associated with a Direct Connect gateway that has a virtual private gateway (VGW) attachment to a VPC. The on-premises network is advertising a route to 10.0.0.0/16. However, the VPC cannot reach on-premises resources. The VPC has a route table with a route to 10.0.0.0/16 pointing to the VGW. What is the MOST likely cause?

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.

A
The VPC route table does not have route propagation enabled for the virtual private gateway
Without propagation, the VPC does not learn on-premises routes.
B
The on-premises router is not using BGP to advertise routes
Why wrong: BGP is required for private VIF, but the VGW may still receive routes.
C
The security group on the VPC instances is blocking inbound traffic
Why wrong: Security groups are stateful and do not affect routing.
D
The Direct Connect gateway does not support the prefix 10.0.0.0/16
Why wrong: Direct Connect gateway supports any prefix.

Full breakdown with real-world context →

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 VPC route table does not have route propagation enabled for the virtual private gateway

Option A is correct because even though the VPC route table contains a static route to 10.0.0.0/16 pointing to the VGW, the VGW must have route propagation enabled on the VPC route table to dynamically learn and install the on-premises route via BGP from the Direct Connect gateway. Without route propagation, the VGW does not propagate the learned prefix into the VPC route table, and the static route may be ignored or not function correctly because the VGW lacks the necessary routing information to forward traffic to the on-premises network. Enabling route propagation ensures the VPC route table includes the dynamically learned route, which is essential for successful communication.

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 VPC route table does not have route propagation enabled for the virtual private gateway
Why this is correct
Without propagation, the VPC does not learn on-premises routes.
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 on-premises router is not using BGP to advertise routes
Why it's wrong here
BGP is required for private VIF, but the VGW may still receive routes.
✗
The security group on the VPC instances is blocking inbound traffic
Why it's wrong here
Security groups are stateful and do not affect routing.
✗
The Direct Connect gateway does not support the prefix 10.0.0.0/16
Why it's wrong here
Direct Connect gateway supports any prefix.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The ANS-C01 exam often tests the distinction between static routes and propagated routes in the context of Direct Connect and VPN attachments, where candidates mistakenly assume that a static route to the VGW is sufficient without enabling route propagation.

Detailed technical explanation

How to think about this question

When a private VIF is associated with a Direct Connect gateway, BGP sessions are established between the on-premises router and the Direct Connect gateway. The Direct Connect gateway then forwards the learned routes to the VGW via the attachment. For the VPC to use these routes, the VPC route table must have route propagation enabled for the VGW; otherwise, the VPC will only use static routes or routes from other propagation sources. In real-world scenarios, forgetting to enable route propagation is a common misconfiguration that leads to asymmetric routing or complete loss of connectivity.

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

Got this wrong? Here's your next step.

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

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FAQ

Questions learners often ask

What does this ANS-C01 question test?

Network Implementation — This question tests Network Implementation — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: The VPC route table does not have route propagation enabled for the virtual private gateway — Option A is correct because even though the VPC route table contains a static route to 10.0.0.0/16 pointing to the VGW, the VGW must have route propagation enabled on the VPC route table to dynamically learn and install the on-premises route via BGP from the Direct Connect gateway. Without route propagation, the VGW does not propagate the learned prefix into the VPC route table, and the static route may be ignored or not function correctly because the VGW lacks the necessary routing information to forward traffic to the on-premises network. Enabling route propagation ensures the VPC route table includes the dynamically learned route, which is essential for successful communication.

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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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.