This ANS-C01 practice question tests your understanding of network design. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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.
Which TWO of the following are valid components of an AWS Transit Gateway design for connecting multiple VPCs and on-premises networks?
Why wrong: VPC Endpoints are for accessing AWS services, not part of Transit Gateway.
B
Transit Gateway endpoint attached to a subnet in a VPC
Why wrong: Transit Gateway attachments are at the VPC level, not endpoint in a subnet.
C
Direct Connect Gateway associated with a Transit Gateway
Why wrong: Direct Connect Gateway is a separate entity; it can be associated with a Transit Gateway but is not a component of the Transit Gateway itself.
D
Transit Gateway route table
Route tables control traffic between attachments.
E
Transit Gateway peering attachment
Peering attachments connect transit gateways across regions.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Transit Gateway route table
Option D is correct because a Transit Gateway route table is a fundamental component that controls how traffic is routed between attachments (VPCs, VPNs, Direct Connect) within the Transit Gateway. Each attachment is associated with exactly one route table, and route propagation enables dynamic learning of routes across the network.
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.
✗
VPC Endpoint Gateway
Why it's wrong here
VPC Endpoints are for accessing AWS services, not part of Transit Gateway.
✗
Transit Gateway endpoint attached to a subnet in a VPC
Why it's wrong here
Transit Gateway attachments are at the VPC level, not endpoint in a subnet.
✗
Direct Connect Gateway associated with a Transit Gateway
Why it's wrong here
Direct Connect Gateway is a separate entity; it can be associated with a Transit Gateway but is not a component of the Transit Gateway itself.
✓
Transit Gateway route table
Why this is correct
Route tables control traffic between attachments.
Related concept
Read the scenario before looking for a memorised answer.
✓
Transit Gateway peering attachment
Why this is correct
Peering attachments connect transit gateways across regions.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
AWS often tests the misconception that a Transit Gateway endpoint attaches to a subnet like a VPC endpoint, but in reality, Transit Gateway attachments are VPC-level constructs that require a subnet in each AZ for the attachment's elastic network interfaces.
Detailed technical explanation
How to think about this question
Transit Gateway route tables support static routes and dynamic route propagation from attachments (e.g., VPN, Direct Connect, VPC). Each route table can have a default route pointing to a network appliance for inspection, and route propagation from a Direct Connect Gateway uses BGP to exchange prefixes, enabling seamless hybrid connectivity. In real-world scenarios, you might use multiple route tables to isolate environments (e.g., production vs. development) while sharing a common on-premises path.
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.
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: Transit Gateway route table — Option D is correct because a Transit Gateway route table is a fundamental component that controls how traffic is routed between attachments (VPCs, VPNs, Direct Connect) within the Transit Gateway. Each attachment is associated with exactly one route table, and route propagation enables dynamic learning of routes across the network.
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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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