- A
Delete the VPC peering connection and use a VPN instead.
Correct. Deleting the VPC peering and using a VPN allows separate routing entries and can handle overlapping CIDRs by using more specific tunnels or separate VPN connections.
- B
Update the on-premises router to advertise a more specific prefix for the new VPC over Direct Connect, such as 10.0.1.0/24, and ensure the new VPC's route table has a route to the on-premises network.
Why wrong: Incorrect. The new VPC is not directly attached to Direct Connect; advertising a more specific prefix over the existing Direct Connect would not reach the new VPC because the Direct Connect VIF is only associated with the old VPC. The on-premises router would still send traffic to the old VPC.
- C
Configure the VPC peering connection to propagate routes to the Direct Connect virtual interface.
Why wrong: Incorrect. VPC peering does not have the ability to propagate routes to Direct Connect virtual interfaces; those are separate routing domains.
- D
Disable route propagation on the VPC route tables and add static routes.
Why wrong: Incorrect. Disabling route propagation and adding static routes only affects the VPC route tables, not the on-premises router's BGP table. Traffic from on-premises to the new VPC will still follow the Direct Connect route to the old VPC.
ANS-C01 Direct Connect Routing Practice Question
This ANS-C01 practice question tests your understanding of network implementation. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. A key principle to apply: direct Connect Routing. 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.
A company has a Direct Connect connection with a private VIF to a VPC. The on-premises network uses BGP to advertise a specific prefix (10.0.0.0/16) to the VPC. Recently, the company deployed a new VPC with CIDR 10.0.0.0/16 in a different region and established a VPC peering connection between the two VPCs. Now, traffic from on-premises to the new VPC is being routed to the old VPC instead. How should the company resolve this issue?
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
Delete the VPC peering connection and use a VPN instead.
The issue is overlapping CIDR blocks (both VPCs use 10.0.0.0/16). VPC peering requires non-overlapping CIDRs. The Direct Connect route for 10.0.0.0/16 causes traffic destined to the new VPC to be sent to the old VPC. Deleting the peering and using a VPN to connect on-premises to the new VPC resolves this because VPNs can handle overlapping CIDRs with separate routing configurations. Option A is correct. Option B is not feasible because the new VPC is not directly connected to Direct Connect; the on-premises router cannot advertise a more specific prefix for the new VPC over the existing Direct Connect. Option C is incorrect because VPC peering does not propagate routes to Direct Connect virtual interfaces. Option D is incorrect because disabling route propagation and adding static routes in the VPC does not change the on-premises BGP routing.
Key principle: Direct Connect Routing
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Delete the VPC peering connection and use a VPN instead.
Why this is correct
Correct. Deleting the VPC peering and using a VPN allows separate routing entries and can handle overlapping CIDRs by using more specific tunnels or separate VPN connections.
Related concept
Direct Connect Routing
- ✗
Update the on-premises router to advertise a more specific prefix for the new VPC over Direct Connect, such as 10.0.1.0/24, and ensure the new VPC's route table has a route to the on-premises network.
Why it's wrong here
Incorrect. The new VPC is not directly attached to Direct Connect; advertising a more specific prefix over the existing Direct Connect would not reach the new VPC because the Direct Connect VIF is only associated with the old VPC. The on-premises router would still send traffic to the old VPC.
- ✗
Configure the VPC peering connection to propagate routes to the Direct Connect virtual interface.
Why it's wrong here
Incorrect. VPC peering does not have the ability to propagate routes to Direct Connect virtual interfaces; those are separate routing domains.
- ✗
Disable route propagation on the VPC route tables and add static routes.
Why it's wrong here
Incorrect. Disabling route propagation and adding static routes only affects the VPC route tables, not the on-premises router's BGP table. Traffic from on-premises to the new VPC will still follow the Direct Connect route to the old VPC.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap is assuming that BGP route advertisements over Direct Connect can be used to reach a VPC that is only peered with the Direct Connect VPC. In reality, the on-premises network can only directly reach VPCs with Direct Connect attachments. For VPCs reachable via peering, overlapping CIDRs cause conflicts that cannot be resolved by just advertising a more specific prefix.
Detailed technical explanation
How to think about this question
The longest prefix match rule dictates that a more specific prefix (e.g., /24) is preferred over a less specific one (e.g., /16), regardless of the route source. In AWS, Direct Connect routes are propagated into VPC route tables as 'Direct Connect Gateway' routes, while VPC peering routes are added manually. If the on-premises router advertises a more specific prefix for the new VPC, the Direct Connect route will take precedence over the VPC peering route for that subnet, ensuring correct traffic flow.
KKey Concepts to Remember
- Direct Connect Routing
- VPC Peering CIDR Overlap
- VPN for Overlapping CIDRs
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Direct Connect Routing
Real-world example
How this comes up in practice
A healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
Visual reference
What to study next
Got this wrong? Here's your next step.
Review direct Connect Routing, then practise related ANS-C01 questions on the same topic to reinforce the concept.
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FAQ
Questions learners often ask
What does this ANS-C01 question test?
Network Implementation — This question tests Network Implementation — Direct Connect Routing.
What is the correct answer to this question?
The correct answer is: Delete the VPC peering connection and use a VPN instead. — The issue is overlapping CIDR blocks (both VPCs use 10.0.0.0/16). VPC peering requires non-overlapping CIDRs. The Direct Connect route for 10.0.0.0/16 causes traffic destined to the new VPC to be sent to the old VPC. Deleting the peering and using a VPN to connect on-premises to the new VPC resolves this because VPNs can handle overlapping CIDRs with separate routing configurations. Option A is correct. Option B is not feasible because the new VPC is not directly connected to Direct Connect; the on-premises router cannot advertise a more specific prefix for the new VPC over the existing Direct Connect. Option C is incorrect because VPC peering does not propagate routes to Direct Connect virtual interfaces. Option D is incorrect because disabling route propagation and adding static routes in the VPC does not change the on-premises BGP routing.
What should I do if I get this ANS-C01 question wrong?
Review direct Connect Routing, then practise related ANS-C01 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
Direct Connect Routing
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Last reviewed: Jul 4, 2026
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