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Question 626 of 1,705

Network Implementation →mediumMultiple 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 uses AWS Transit Gateway to connect multiple VPCs. The network team notices that traffic between two VPCs is taking a suboptimal path through a third VPC. 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
Security groups are blocking the direct path, forcing traffic through a third VPC.
Why wrong: Security groups do not influence routing decisions.
B
BGP is not configured between the VPCs, so traffic defaults through a transit VPC.
Why wrong: BGP is not used for VPC-to-VPC routing in Transit Gateway.
C
ECMP routing is enabled, causing traffic to be load-balanced across multiple paths.
Why wrong: ECMP distributes traffic across equal-cost paths, not suboptimal routing.
D
Incorrect route table associations and propagations in the Transit Gateway.
Route tables determine which attachments can reach each other.

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

✓

Incorrect route table associations and propagations in the Transit Gateway.

Incorrect route table associations and propagations in the Transit Gateway cause traffic between two VPCs to take a suboptimal path through a third VPC. The Transit Gateway uses route tables to determine the next hop for traffic; if the route table for the source VPC does not have a direct route to the destination VPC but instead has a route pointing to the third VPC (e.g., via a VPN attachment or a transit VPC attachment), traffic will be forwarded through that third VPC. This is a common misconfiguration when route propagation is not properly set up or when static routes are incorrectly prioritized.

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.

✗
Security groups are blocking the direct path, forcing traffic through a third VPC.
Why it's wrong here
Security groups do not influence routing decisions.
✗
BGP is not configured between the VPCs, so traffic defaults through a transit VPC.
Why it's wrong here
BGP is not used for VPC-to-VPC routing in Transit Gateway.
✗
ECMP routing is enabled, causing traffic to be load-balanced across multiple paths.
Why it's wrong here
ECMP distributes traffic across equal-cost paths, not suboptimal routing.
✓
Incorrect route table associations and propagations in the Transit Gateway.
Why this is correct
Route tables determine which attachments can reach each other.
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.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates often assume traffic between VPCs in a Transit Gateway always takes the most direct path, but they overlook that route table associations and propagations control the path, and a misconfigured route table can force traffic through an intermediate VPC even when a direct attachment exists.

Detailed technical explanation

How to think about this question

AWS Transit Gateway supports multiple route tables, and each VPC attachment is associated with a specific route table. Route propagation from attachments (e.g., VPN, Direct Connect, or VPC) can dynamically add routes, but if the destination VPC's CIDR is not propagated to the source VPC's route table, or if a static route with a lower prefix length points to a transit VPC, traffic will be forwarded through that intermediate VPC. This misconfiguration is often seen in hub-and-spoke designs where the transit VPC is used for inspection or NAT, but the route tables are not correctly scoped to allow direct VPC-to-VPC communication.

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: Incorrect route table associations and propagations in the Transit Gateway. — Incorrect route table associations and propagations in the Transit Gateway cause traffic between two VPCs to take a suboptimal path through a third VPC. The Transit Gateway uses route tables to determine the next hop for traffic; if the route table for the source VPC does not have a direct route to the destination VPC but instead has a route pointing to the third VPC (e.g., via a VPN attachment or a transit VPC attachment), traffic will be forwarded through that third VPC. This is a common misconfiguration when route propagation is not properly set up or when static routes are incorrectly prioritized.

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.