- A
Enable route propagation from the VPC attachments into the Transit Gateway route table.
Route propagation allows VPC routes to be exchanged, enabling direct routing.
- B
Disable cross-zone load balancing on the Transit Gateway.
Why wrong: Option B is incorrect because cross-zone load balancing is for load balancers, not routing.
- C
Add static routes to the Transit Gateway route table pointing to the VPN attachment.
Why wrong: That would force traffic to on-premises, making it worse.
- D
Modify the VPC route tables to add routes to the other VPC via the Transit Gateway.
Why wrong: Option D is incorrect because VPN attachments do not affect VPC-to-VPC routing.
Question 289 of 1,705
Fixing Suboptimal Routing Between VPCs in Transit Gateway
This ANS-C01 practice question tests your understanding of network management and operations. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. A key principle to apply: transit Gateway route table. 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 interconnect multiple VPCs and on-premises networks. They notice that traffic between two VPCs is taking a suboptimal path through the on-premises network instead of staying within AWS. What configuration change should be made to ensure optimal routing?
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
✓
Enable route propagation from the VPC attachments into the Transit Gateway route table.
Option A is correct because Transit Gateway route tables control the path; enabling route propagation from VPC attachments will add routes for direct VPC-to-VPC communication. Option B is incorrect because cross-zone load balancing is a feature of load balancers, not Transit Gateway routing. Option C is incorrect because adding static routes to the VPN attachment would force traffic through the VPN, which is suboptimal. Option D is incorrect because modifying VPC route tables to point to the Transit Gateway is necessary for VPCs to send traffic to the Transit Gateway, but it does not control the Transit Gateway's internal path selection; the issue is about the Transit Gateway route table, not VPC route tables.
Key principle: Transit Gateway route table
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Enable route propagation from the VPC attachments into the Transit Gateway route table.
Why this is correct
Route propagation allows VPC routes to be exchanged, enabling direct routing.
Related concept
Transit Gateway route table
- ✗
Disable cross-zone load balancing on the Transit Gateway.
Why it's wrong here
Option B is incorrect because cross-zone load balancing is for load balancers, not routing.
- ✗
Add static routes to the Transit Gateway route table pointing to the VPN attachment.
Why it's wrong here
That would force traffic to on-premises, making it worse.
- ✗
Modify the VPC route tables to add routes to the other VPC via the Transit Gateway.
Why it's wrong here
Option D is incorrect because VPN attachments do not affect VPC-to-VPC routing.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
Treat this as a scenario question. Identify the problem, the constraint, and the best action. Then compare each option against those facts.
KKey Concepts to Remember
- Transit Gateway route table
- Route propagation
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
Transit Gateway route table
Real-world example
How this comes up in practice
A healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
What to study next
Got this wrong? Here's your next step.
Review transit Gateway route table, then practise related ANS-C01 questions on the same topic to reinforce the concept.
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FAQ
Questions learners often ask
What does this ANS-C01 question test?
Network Management and Operations — This question tests Network Management and Operations — Transit Gateway route table.
What is the correct answer to this question?
The correct answer is: Enable route propagation from the VPC attachments into the Transit Gateway route table. — Option A is correct because Transit Gateway route tables control the path; enabling route propagation from VPC attachments will add routes for direct VPC-to-VPC communication. Option B is incorrect because cross-zone load balancing is a feature of load balancers, not Transit Gateway routing. Option C is incorrect because adding static routes to the VPN attachment would force traffic through the VPN, which is suboptimal. Option D is incorrect because modifying VPC route tables to point to the Transit Gateway is necessary for VPCs to send traffic to the Transit Gateway, but it does not control the Transit Gateway's internal path selection; the issue is about the Transit Gateway route table, not VPC route tables.
What should I do if I get this ANS-C01 question wrong?
Review transit Gateway route table, then practise related ANS-C01 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
Transit Gateway route table
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Last reviewed: Jun 20, 2026
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