- A
Security groups not allowing return traffic.
Why wrong: Security groups are stateful.
- B
Missing routes in the VPC route tables pointing to the Transit Gateway.
Without routes, traffic cannot be forwarded to Transit Gateway.
- C
Transit Gateway does not support transitive routing.
Why wrong: Transit Gateway does support transitive routing.
- D
Network ACLs blocking traffic.
Why wrong: NACLs could block, but missing routes is more likely.
Question 1,193 of 1,733
PAS-C01 Technology Practice Question
This PAS-C01 practice question tests your understanding of technology. 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.
A company runs SAP on AWS and uses AWS Transit Gateway to connect multiple VPCs. They notice that inter-VPC traffic is being dropped. What is a likely cause?
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
✓
Missing routes in the VPC route tables pointing to the Transit Gateway.
AWS Transit Gateway requires explicit routes in each VPC's route table pointing to the Transit Gateway attachment ID for traffic to be forwarded between VPCs. Without these routes, the VPCs have no path to reach the Transit Gateway, causing inter-VPC traffic to be dropped at the VPC router level.
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 not allowing return traffic.
Why it's wrong here
Security groups are stateful.
- ✓
Missing routes in the VPC route tables pointing to the Transit Gateway.
Why this is correct
Without routes, traffic cannot be forwarded to Transit Gateway.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Transit Gateway does not support transitive routing.
Why it's wrong here
Transit Gateway does support transitive routing.
- ✗
Network ACLs blocking traffic.
Why it's wrong here
NACLs could block, but missing routes is more likely.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume Transit Gateway automatically enables inter-VPC routing without requiring explicit VPC route table entries, confusing Transit Gateway's transitive routing capability with the need for proper route propagation in each VPC.
Detailed technical explanation
How to think about this question
Transit Gateway uses a centralized routing table that propagates routes from attached VPCs, but each VPC's route table must have a static route pointing to the Transit Gateway's attachment ID (e.g., tgw-xxxxxxxx) for the destination VPC CIDR. Without this route, the VPC router has no next-hop to forward packets to the Transit Gateway, even if the Transit Gateway itself has the correct routes. This is a common misconfiguration when initially setting up Transit Gateway with multiple VPCs.
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 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.
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FAQ
Questions learners often ask
What does this PAS-C01 question test?
Technology — This question tests Technology — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Missing routes in the VPC route tables pointing to the Transit Gateway. — AWS Transit Gateway requires explicit routes in each VPC's route table pointing to the Transit Gateway attachment ID for traffic to be forwarded between VPCs. Without these routes, the VPCs have no path to reach the Transit Gateway, causing inter-VPC traffic to be dropped at the VPC router level.
What should I do if I get this PAS-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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Last reviewed: Jul 4, 2026
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