- A
Create a second private virtual interface to the second VPC.
Why wrong: Private VIF is per VPC, but one connection can have multiple VIFs.
- B
Set up a Site-to-Site VPN over the Direct Connect connection to the second VPC.
Why wrong: VPN is possible but not the best use of Direct Connect.
- C
Use a Transit Gateway and a transit virtual interface.
Transit VIF connects to TGW, which can attach to multiple VPCs.
- D
Order a second Direct Connect connection.
Why wrong: Unnecessary; one connection can serve multiple VPCs via TGW.
Question 317 of 1,705
Direct Connect to Multiple VPCs: Using Transit Gateway and Transit VIF
This ANS-C01 practice question tests your understanding of network implementation. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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.
A company has a Direct Connect connection with a private virtual interface to a VPC. They want to use the same Direct Connect connection to access another VPC in the same region. Which solution should they implement?
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
✓
Use a Transit Gateway and a transit virtual interface.
A Transit Gateway (TGW) allows you to attach multiple VPCs and a Direct Connect Gateway (DXGW) via a transit virtual interface (VIF). This enables a single Direct Connect connection to route traffic to multiple VPCs in the same region without additional physical connections or private VIFs. The TGW acts as a central hub, simplifying network architecture and reducing operational overhead.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Create a second private virtual interface to the second VPC.
Why it's wrong here
Private VIF is per VPC, but one connection can have multiple VIFs.
- ✗
Set up a Site-to-Site VPN over the Direct Connect connection to the second VPC.
Why it's wrong here
VPN is possible but not the best use of Direct Connect.
- ✓
Use a Transit Gateway and a transit virtual interface.
Why this is correct
Transit VIF connects to TGW, which can attach to multiple VPCs.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Order a second Direct Connect connection.
Why it's wrong here
Unnecessary; one connection can serve multiple VPCs via TGW.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The ANS-C01 exam often tests the misconception that a private virtual interface can be shared across multiple VPCs directly, but the correct approach requires a Transit Gateway and a transit virtual interface to aggregate connectivity.
Detailed technical explanation
How to think about this question
A transit virtual interface operates at Layer 3 and uses BGP to exchange routes with a Direct Connect Gateway, which then propagates routes to attached Transit Gateways. The Transit Gateway uses a route table to control traffic between VPCs, and you can implement segmentation using TGW route tables and attachments, enabling hub-and-spoke or isolated VPC designs. In a real-world scenario, this setup allows a company to connect production, development, and management VPCs over a single Direct Connect circuit while maintaining strict routing policies.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
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
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
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
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FAQ
Questions learners often ask
What does this ANS-C01 question test?
Network Implementation — This question tests Network Implementation — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use a Transit Gateway and a transit virtual interface. — A Transit Gateway (TGW) allows you to attach multiple VPCs and a Direct Connect Gateway (DXGW) via a transit virtual interface (VIF). This enables a single Direct Connect connection to route traffic to multiple VPCs in the same region without additional physical connections or private VIFs. The TGW acts as a central hub, simplifying network architecture and reducing operational overhead.
What should I do if I get this ANS-C01 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Same concept, more angles
1 more ways this is tested on ANS-C01
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A company has a Direct Connect connection with a private virtual interface (VIF) attached to a Virtual Private Gateway (VGW) that is associated with a single VPC (10.0.0.0/16). The on-premises network uses BGP to exchange routes. The company has recently acquired another company and needs to connect to their VPC (172.16.0.0/16) in the same region. They want to use the existing Direct Connect connection to access both VPCs. The network engineer creates a Transit Gateway, attaches both VPCs, and creates a transit virtual interface (VIF) to the Transit Gateway. The engineer also deletes the private VIF. However, after the change, on-premises users cannot reach either VPC. What should the engineer do to restore connectivity?
medium- ✓ A.Configure BGP on the on-premises router to peer with the Transit Gateway over the transit VIF.
- B.Attach the VPCs to the Transit Gateway with different route tables.
- C.Create a new private VIF to each VPC.
- D.Enable route propagation on the Transit Gateway route tables.
Why A: When the private VIF was replaced with a transit VIF to the Transit Gateway, the on-premises router lost its BGP peering with the VGW. To restore connectivity, the on-premises router must be configured to establish BGP peering with the Transit Gateway over the transit VIF. This allows route exchange between on-premises and both VPCs attached to the Transit Gateway. Option A is correct. Option B is incorrect because attaching VPCs with different route tables is not the issue; the VPCs are already attached. Option C is incorrect because creating separate private VIFs would be unnecessary and defeats the purpose of using a Transit Gateway. Option D is incorrect because route propagation is already enabled by default when VPCs are attached to a Transit Gateway; the missing piece is the BGP session from on-premises.
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Last reviewed: Jul 4, 2026
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