ANS-C01 Network Design Practice Question
A company wants to connect its on-premises data center to AWS using AWS Direct Connect and wants to use the same connection to access multiple VPCs in the same AWS region. The company also needs to maintain private IP connectivity between the VPCs. Which THREE components should the company use to meet these requirements? (Choose three.)
⚠ Common exam trap
Many candidates confuse VPC peering with transit gateway, assuming peering can provide transitive routing or work with a single Direct Connect connection, but AWS explicitly requires a transit gateway for hub-and-spoke connectivity with Direct Connect.
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
✓
Transit Gateway VPC attachments
Transit Gateway VPC attachments allow multiple VPCs to connect to a central transit gateway, enabling private IP connectivity between them. When combined with an AWS Direct Connect gateway, the on-premises data center can use a single Direct Connect connection to reach all attached VPCs via the transit gateway, meeting both requirements efficiently.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Transit Gateway VPC attachments
Why this is correct
Each VPC must be attached to the Transit Gateway to enable connectivity through the Transit Gateway.
- ✗
VPC peering connections between each VPC
Why it's wrong here
VPC peering does not support transitive routing and would require many connections, not integrating with Direct Connect.
- ✗
AWS Site-to-Site VPN connection
Why it's wrong here
A VPN connection is not necessary if using Direct Connect; it would add complexity and cost.
- ✓
AWS Direct Connect gateway
Why this is correct
A Direct Connect gateway is used to associate a Direct Connect virtual interface with one or more Transit Gateways in the same or different accounts/regions.
- ✓
AWS Transit Gateway
Why this is correct
Transit Gateway acts as a hub for connecting multiple VPCs and the Direct Connect virtual interface, enabling transitive routing.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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