ANS-C01 Network Implementation Practice Question
A company has a Direct Connect connection with a private VIF to a VPC. The on-premises network is advertising a default route (0.0.0.0/0) over BGP. The VPC has an internet gateway attached. When an EC2 instance in the VPC sends traffic to an internet destination, which path does it take by default?
⚠ Common exam trap
The ANS-C01 exam often tests the misconception that an internet gateway always takes precedence for internet-bound traffic, but the trap here is that a BGP-advertised default route via Direct Connect is treated as a static route in the VPC, overriding the internet gateway's implicit route for the same destination.
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
✓
Traffic goes to the on-premises network via Direct Connect.
When an on-premises network advertises a default route (0.0.0.0/0) over BGP via a Direct Connect private VIF, that route is propagated into the VPC route tables as a static route. By default, the most specific route (longest prefix match) is preferred, but since both the internet gateway and the BGP-advertised route are for 0.0.0.0/0, the BGP route takes precedence because it is learned via a more specific path (Direct Connect) and is considered a static route in the VPC route table, overriding the internet gateway's implicit route.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Traffic goes to the on-premises network only if there is a static route.
Why it's wrong here
BGP propagates the route automatically.
- ✗
Traffic is dropped because there is no route.
Why it's wrong here
There is a route via Direct Connect.
- ✗
Traffic goes to the internet via the internet gateway.
Why it's wrong here
Unless a more specific route to IGW exists, the BGP route takes precedence.
- ✓
Traffic goes to the on-premises network via Direct Connect.
Why this is correct
The propagated BGP route is more specific than a default route to IGW, if any.
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