ANS-C01 Network Design Practice Question
A company is designing a hybrid network using AWS Direct Connect. They want to extend their on-premises network to multiple VPCs in the same AWS Region. Which resource should they use to achieve this?
⚠ Common exam trap
It's easy for candidates to confuse a Direct Connect gateway with a transit gateway or a private VIF, mistakenly thinking a private VIF alone can connect to multiple VPCs, but AWS requires a Direct Connect gateway to aggregate multiple VPC associations under a single VIF.
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
✓
Direct Connect gateway
A Direct Connect gateway is the correct resource because it allows you to associate up to 10 VPCs (or 20 with a quota increase) in the same or different AWS Regions with a single Direct Connect connection. It acts as a central hub, enabling connectivity from your on-premises network to multiple VPCs via a single private virtual interface (VIF) attached to the Direct Connect gateway, without needing separate VIFs per VPC.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Direct Connect transit virtual interface
Why it's wrong here
A transit VIF connects to a Transit Gateway, not directly to multiple VPCs.
- ✓
Direct Connect gateway
Why this is correct
A Direct Connect gateway allows a single private virtual interface to connect to multiple VPCs in the same Region, satisfying the requirement to extend the on-premises network to more than one VPC without provisioning separate virtual interfaces per VPC. This gateway aggregates traffic across VPCs, enabling transitive routing while keeping each VPC’s route table isolated.
- ✗
Direct Connect private virtual interface (VIF)
Why it's wrong here
A private VIF connects to only one VPC.
- ✗
Link Aggregation Group (LAG)
Why it's wrong here
LAG is for aggregating bandwidth, not for connecting to multiple VPCs.
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