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Network Implementation →hardMultiple ChoiceObjective-mapped

ANS-C01 Network Implementation Practice Question

This ANS-C01 practice question tests your understanding of network implementation. 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 company has an AWS Direct Connect connection with a private VIF to a VPC. The VPC has multiple subnets across two Availability Zones. The company wants to use the Direct Connect connection as the primary path for all traffic from on-premises to the VPC, and use a Site-to-Site VPN as a backup. The on-premises router is configured to advertise a default route via BGP over the Direct Connect, and the VPN also advertises a default route. Which configuration ensures that the Direct Connect path is preferred over the VPN?

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
Disable route propagation from the VPN in the VPC route tables to ensure Direct Connect routes take precedence.
Why wrong: This would remove VPN routes altogether, not provide failover.
B
Set a higher local preference on the Direct Connect BGP session on the on-premises router.
Why wrong: Local preference is not directly controlled by AWS configuration.
C
Decrease the Multi-Exit Discriminator (MED) value on the Direct Connect BGP advertisements from AWS.
Why wrong: MED is not typically set by AWS; it's more common to adjust on-premises.
D
Configure AS_PATH prepending on the VPN BGP advertisements from the on-premises router to make the VPN path longer.
Longer AS_PATH makes the route less preferred.

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 AS_PATH prepending on the VPN BGP advertisements from the on-premises router to make the VPN path longer.

Option D is correct because AS_PATH prepending increases the AS path length for routes advertised over the VPN, making them less preferred compared to the Direct Connect routes when both paths advertise a default route. BGP selects the path with the shortest AS_PATH length when all other attributes are equal, so prepending on the VPN ensures Direct Connect is the primary 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.

✗
Disable route propagation from the VPN in the VPC route tables to ensure Direct Connect routes take precedence.
Why it's wrong here
This would remove VPN routes altogether, not provide failover.
✗
Set a higher local preference on the Direct Connect BGP session on the on-premises router.
Why it's wrong here
Local preference is not directly controlled by AWS configuration.
✗
Decrease the Multi-Exit Discriminator (MED) value on the Direct Connect BGP advertisements from AWS.
Why it's wrong here
MED is not typically set by AWS; it's more common to adjust on-premises.
✓
Configure AS_PATH prepending on the VPN BGP advertisements from the on-premises router to make the VPN path longer.
Why this is correct
Longer AS_PATH makes the route less preferred.
Clue confirmation
The clue word "primary" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates often confuse local preference (which influences outbound traffic from on-premises) with AS_PATH prepending (which influences inbound traffic to the VPC), and they may incorrectly assume that disabling route propagation or adjusting MED is the correct way to prioritize Direct Connect over VPN.

Detailed technical explanation

How to think about this question

In BGP, when multiple paths to the same prefix exist, the path with the shortest AS_PATH length is preferred after considering weight, local preference, and locally originated routes. AS_PATH prepending artificially lengthens the AS path by adding the on-premises AS number multiple times, making the VPN path appear longer and thus less preferred. This technique is commonly used in hybrid connectivity scenarios where Direct Connect and VPN both advertise the same routes, ensuring failover behavior without relying on MED or local preference adjustments that may not be supported or consistent across different providers.

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

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.

Visual reference

What to study next

Got this wrong? Here's your next step.

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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 AS_PATH prepending on the VPN BGP advertisements from the on-premises router to make the VPN path longer. — Option D is correct because AS_PATH prepending increases the AS path length for routes advertised over the VPN, making them less preferred compared to the Direct Connect routes when both paths advertise a default route. BGP selects the path with the shortest AS_PATH length when all other attributes are equal, so prepending on the VPN ensures Direct Connect is the primary 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.