Quick Answer
The answer is that the Direct Connect gateway is not associated with the virtual private gateway or route propagation is not enabled. This is the most likely cause because even though the private VIF is in the 'available' state and the BGP session is up, the on-premises network cannot reach VPC resources if the Direct Connect gateway has not been properly linked to the virtual private gateway, or if route propagation from the VPC is disabled. Without this association, the VPC routes are never advertised to the on-premises router over BGP, leaving the on-premises side with no path to the VPC. On the AWS Certified Advanced Networking Specialty ANS-C01 exam, this scenario tests your understanding of the full data path for Direct Connect private VIF troubleshooting—a common trap is assuming a healthy BGP session guarantees connectivity, but it only confirms Layer 3 peering, not route exchange. A useful memory tip is "BGP up does not mean routes through"—always verify the gateway association and propagation to complete the path.
This ANS-C01 practice question tests your understanding of network management and operations. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Refer to the exhibit. A Direct Connect private virtual interface is in the 'available' state, and the BGP session is up. However, the on-premises network cannot reach any resources in the VPC attached to the Direct Connect gateway. What is the MOST likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
The BGP ASN is private and not allowed
Why wrong: Private ASNs are allowed.
The VLAN ID is incorrect
Why wrong: VLAN is configured.
The Direct Connect gateway is not associated with the virtual private gateway or route propagation is not enabled
Routes are not being advertised.
The BGP session is not established
Why wrong: BGP status shows 'up'.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
The Direct Connect gateway is not associated with the virtual private gateway or route propagation is not enabled
Option B is correct because even though the BGP session is up, the on-premises router may not be learning the VPC routes. The Direct Connect gateway must be associated with the virtual private gateway and route propagation must be enabled. Option A is incorrect because the BGP session is up. Option C is incorrect because the VLAN is configured. Option D is incorrect because the ASN is valid.
Key principle: A trunk being up does not mean the VLAN is allowed across it. Always verify the allowed VLAN list and whether the VLAN exists on both switches.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
The BGP ASN is private and not allowed
Why it's wrong here
Private ASNs are allowed.
The VLAN ID is incorrect
Why it's wrong here
VLAN is configured.
The Direct Connect gateway is not associated with the virtual private gateway or route propagation is not enabled
Why this is correct
Routes are not being advertised.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Access ports place end devices into a single VLAN.
The BGP session is not established
Why it's wrong here
BGP status shows 'up'.
Common exam traps
A trunk being up does not prove every VLAN is crossing it. Check allowed VLAN lists, native VLAN mismatch, VLAN existence and access-port assignment.
Trap categories for this question
Command / output trap
BGP status shows 'up'.
Detailed technical explanation
VLAN questions usually combine access-port and trunking clues. The key is to identify whether the issue is local to one switchport, caused by the trunk, or caused by the VLAN not existing where it needs to exist.
Key takeaway
A trunk being up does not mean the VLAN is allowed across it. Always verify the allowed VLAN list and whether the VLAN exists on both switches.
Real-world example
A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
What to study next
Review VLAN allowed lists, native VLAN mismatch detection, and how to verify VLAN membership with show vlan brief and show interfaces trunk. Then practise related ANS-C01 questions on switching, trunking, and access-port configuration.
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FAQ
Network Management and Operations — This question tests Network Management and Operations — Access ports place end devices into a single VLAN..
The correct answer is: The Direct Connect gateway is not associated with the virtual private gateway or route propagation is not enabled — Option B is correct because even though the BGP session is up, the on-premises router may not be learning the VPC routes. The Direct Connect gateway must be associated with the virtual private gateway and route propagation must be enabled. Option A is incorrect because the BGP session is up. Option C is incorrect because the VLAN is configured. Option D is incorrect because the ASN is valid.
Review VLAN allowed lists, native VLAN mismatch detection, and how to verify VLAN membership with show vlan brief and show interfaces trunk. Then practise related ANS-C01 questions on switching, trunking, and access-port configuration.
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Access ports place end devices into a single VLAN.
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Last reviewed: Jun 20, 2026
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