ANS-C01 Network Design Practice Question
Network Topology
A network engineer is troubleshooting a Direct Connect private VIF. The VIF is in 'available' state but traffic is not flowing to the VPC. The VGW is attached to the VPC. What is the most likely cause?
⚠ Common exam trap
Many candidates assume an 'available' VIF and established BGP automatically mean traffic flows, but they overlook the critical requirement of a VPC route table entry pointing to the VGW as the next hop.
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
✓
The VPC route table lacks a route to the on-premises network pointing to the VGW.
When a Direct Connect private VIF is in the 'available' state, the physical and logical layer 2 connectivity is established, and BGP sessions are typically up. However, traffic still cannot flow to the VPC unless the VPC route table contains a route that directs traffic destined for the on-premises network to the Virtual Private Gateway (VGW). Without this route, the VPC has no path to send traffic over the Direct Connect connection, even though the VIF and BGP are operational.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
The VPC route table lacks a route to the on-premises network pointing to the VGW.
Why this is correct
Without this route, traffic cannot be forwarded.
- ✗
The route filter prefix for the VPC CIDR is misconfigured.
Why it's wrong here
It shows 10.0.0.0/16, which is correct.
- ✗
BGP is not established between the on-premises router and the VGW.
Why it's wrong here
BGP is used for route exchange, but the VIF state indicates routing is configured.
- ✗
The VIF state is not 'available'.
Why it's wrong here
It is 'available'.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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