The correct resource to create is a private virtual interface (VIF) with a BGP session to the virtual private gateway (VGW). This configuration establishes a single logical connection over the Direct Connect link that provides access to all subnets in the VPC, because the private VIF terminates on the VGW, which routes traffic to every subnet in the attached VPC via its route tables. On the AWS Certified Advanced Networking Specialty ANS-C01 exam, this question tests your understanding of Direct Connect virtual interface types and their specific use cases—a common trap is confusing a private VIF with a public VIF, which only reaches public IP addresses, or a transit VIF, which is used with a transit gateway for multi-VPC connectivity. Remember the key distinction: private VIF equals VPC access through a VGW, while public VIF equals AWS public services. A helpful memory tip is “Private VIF, private VPC—public VIF, public IPs.”
ANS-C01 Network Implementation Practice Question
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 is setting up a Direct Connect connection to AWS. They have a virtual private gateway (VGW) attached to their VPC. They need to establish a single logical connection over the Direct Connect link to access all subnets in the VPC. Which resource should they create on the Direct Connect virtual interface?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
A private virtual interface (VIF) with a BGP session to the VGW.
Option C is correct. A private virtual interface (VIF) allows access to all subnets in the VPC through the VGW. Option A is wrong because a public VIF provides access to public IP addresses. Option B is wrong because a transit VIF is used with a transit gateway. Option D is wrong because a hosted VIF is a shared connection.
Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
A private virtual interface (VIF) with a BGP session to the VGW.
Why this is correct
Private VIF allows access to the entire VPC via the VGW.
A hosted virtual interface (VIF) provided by an AWS Partner.
Why it's wrong here
Hosted VIF is for shared connections, not the recommended direct connection.
✗
A public virtual interface (VIF) with a BGP session to the VGW.
Why it's wrong here
Public VIF connects to AWS public services, not the VPC.
✗
A transit virtual interface (VIF) to the VGW.
Why it's wrong here
Transit VIF connects to a Direct Connect gateway, not directly to VGW.
Common exam traps
Common exam trap: usable hosts are not the same as total addresses
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Detailed technical explanation
How to think about this question
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
KKey Concepts to Remember
CIDR notation defines the prefix length.
Block size helps identify subnet boundaries.
Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
The required host count determines the smallest suitable subnet.
TExam Day Tips
→Write the block size before choosing the subnet.
→Check whether the question asks for hosts, subnets or a specific address range.
→Do not confuse /24, /25, /26 and /27 host counts.
Key takeaway
Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
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
Got this wrong? Here's your next step.
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related ANS-C01 subnetting questions on CIDR, address ranges, and subnet selection.
Network Implementation — This question tests Network Implementation — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: A private virtual interface (VIF) with a BGP session to the VGW. — Option C is correct. A private virtual interface (VIF) allows access to all subnets in the VPC through the VGW. Option A is wrong because a public VIF provides access to public IP addresses. Option B is wrong because a transit VIF is used with a transit gateway. Option D is wrong because a hosted VIF is a shared connection.
What should I do if I get this ANS-C01 question wrong?
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related ANS-C01 subnetting questions on CIDR, address ranges, and subnet selection.
What is the key concept behind this question?
CIDR notation defines the prefix length.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
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 wants to use AWS Direct Connect to establish a dedicated network connection from their on-premises data center to AWS. They need to connect to a VPC in the us-east-1 region. Which of the following is a required step in the setup process?
easy
A.Attach a Transit Gateway to the VPC.
B.Configure CloudFront to route traffic through the Direct Connect.
C.Create a site-to-site VPN connection as a backup.
✓ D.Create a private virtual interface and attach it to a Virtual Private Gateway.
Why D: To establish a Direct Connect connection to a VPC, you must create a private virtual interface (VIF) and attach it to a Virtual Private Gateway (VGW) that is attached to the VPC. The private VIF carries traffic over the dedicated connection and uses BGP to exchange routes between the on-premises network and the VPC via the VGW. This is the core requirement for routing traffic from the Direct Connect link into a VPC.
Last reviewed: Jun 20, 2026
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