ANS-C01 Network Design Practice Question
A company is designing a VPC with the following requirements: (1) Ability to connect to on-premises via AWS Direct Connect with BGP, (2) Ability to route traffic between multiple VPCs, (3) Centralized inspection of traffic between VPCs. Which AWS services should the company use? (Choose TWO.)
⚠ Common exam trap
AWS often tests the misconception that VPC peering can be used for transitive routing or centralized inspection, but peering is non-transitive and requires full-mesh connectivity, making Transit Gateway the correct hub solution.
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
✓
AWS Transit Gateway
AWS Transit Gateway (C) is correct because it acts as a central hub to interconnect multiple VPCs and on-premises networks, enabling transitive routing between all attached networks. It supports centralized traffic inspection by routing VPC-to-VPC traffic through a shared inspection VPC (e.g., with a firewall appliance) using route tables and attachments.
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 peering connections
Why it's wrong here
Does not support centralized inspection.
- ✗
VPC endpoints
Why it's wrong here
Not for inter-VPC connectivity.
- ✓
AWS Transit Gateway
Why this is correct
Central hub for inter-VPC routing and inspection.
- ✓
Direct Connect Gateway
Why this is correct
Connects Direct Connect to Transit Gateway for hybrid connectivity.
- ✗
AWS Site-to-Site VPN
Why it's wrong here
Does not provide inter-VPC routing.
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Same concept, more angles
1 more way this is tested on ANS-C01
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. Which TWO statements about AWS Transit Gateway are correct? (Choose two.)
medium- A.It provides internet access for attached VPCs
- ✓ B.It supports transitive routing between attached VPCs
- ✓ C.It can be shared across AWS accounts using AWS Resource Access Manager
- D.It can replace AWS Direct Connect for on-premises connectivity
- E.It only supports VPN attachments
Why B: AWS Transit Gateway (TGW) acts as a central hub that enables transitive routing between all attached VPCs. When you attach multiple VPCs to the same TGW, their route tables are configured to point to the TGW, allowing traffic to flow from one VPC to another through the hub without needing individual VPC peering connections. This transitive behavior is a core feature of TGW, simplifying network architecture and reducing the number of routing paths required.
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.