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Question 807 of 1,705

Network Implementation →hardMultiple ChoiceObjective-mapped

ANS-C01 Network Implementation Practice Question

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 implementing a hybrid network architecture with AWS Direct Connect and a VPN backup. The company has two Direct Connect connections from different providers terminating at two AWS Direct Connect locations, each connecting to a separate AWS Transit Gateway in the same region. The VPCs are attached to both transit gateways. The company needs to ensure that traffic from on-premises to VPCs uses the primary Direct Connect connection when available and fails over to the secondary Direct Connect connection, then to the VPN. How should the company configure routing to achieve this?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "primary"
Why it matters: Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.

A
Configure BGP AS_PATH prepending on the secondary Direct Connect and VPN connections to make them less preferred than the primary Direct Connect.
AS_PATH prepending influences BGP best path selection.
B
Disable route propagation from the VPN to the transit gateway route tables, and rely on the Direct Connect connections only.
Why wrong: Does not provide failover priority among Direct Connect connections.
C
Configure equal-cost multipath (ECMP) routing across all three connections to load balance traffic.
Why wrong: ECMP does not provide failover priority; all paths active simultaneously.
D
Use static routes in the transit gateway route tables with higher metric values for the secondary Direct Connect and VPN.
Why wrong: Static routes are not supported with Direct Connect; BGP is mandatory.

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

✓

Configure BGP AS_PATH prepending on the secondary Direct Connect and VPN connections to make them less preferred than the primary Direct Connect.

BGP AS_PATH prepending on the secondary Direct Connect and VPN connections artificially increases the AS path length, making those routes less preferred in the BGP best-path selection process. This ensures that the primary Direct Connect connection is chosen for traffic from on-premises to VPCs when available, with automatic failover to the secondary Direct Connect and then to the VPN as the least preferred path.

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.

✓
Configure BGP AS_PATH prepending on the secondary Direct Connect and VPN connections to make them less preferred than the primary Direct Connect.
Why this is correct
AS_PATH prepending influences BGP best path selection.
Clue confirmation
The clue word "primary" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Disable route propagation from the VPN to the transit gateway route tables, and rely on the Direct Connect connections only.
Why it's wrong here
Does not provide failover priority among Direct Connect connections.
✗
Configure equal-cost multipath (ECMP) routing across all three connections to load balance traffic.
Why it's wrong here
ECMP does not provide failover priority; all paths active simultaneously.
✗
Use static routes in the transit gateway route tables with higher metric values for the secondary Direct Connect and VPN.
Why it's wrong here
Static routes are not supported with Direct Connect; BGP is mandatory.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates may think static routes with metrics can be used in transit gateway route tables to influence path selection, but BGP-based routing in hybrid networks requires manipulating BGP attributes like AS_PATH, not static route metrics.

Detailed technical explanation

How to think about this question

BGP AS_PATH prepending works by adding repeated AS numbers to the AS_PATH attribute, which increases the path length and makes the route less preferred compared to a shorter path. In AWS Direct Connect, you can configure this on the on-premises router for the secondary connection and VPN, while the primary connection advertises routes with a normal AS_PATH. This leverages the BGP best-path selection algorithm, which prefers the shortest AS_PATH, ensuring deterministic failover without relying on proprietary metrics.

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 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

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: Configure BGP AS_PATH prepending on the secondary Direct Connect and VPN connections to make them less preferred than the primary Direct Connect. — BGP AS_PATH prepending on the secondary Direct Connect and VPN connections artificially increases the AS path length, making those routes less preferred in the BGP best-path selection process. This ensures that the primary Direct Connect connection is chosen for traffic from on-premises to VPCs when available, with automatic failover to the secondary Direct Connect and then to the VPN as the least preferred path.

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: "primary". Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.

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.