- A
Attach the VPC to an AWS Transit Gateway
Why wrong: Transit Gateway is optional and not required for a simple Direct Connect setup with one VPC.
- B
Create a private virtual interface (VIF) on the Direct Connect connection
Private VIF allows connectivity to the VPC via the Virtual Private Gateway.
- C
Configure static routes or BGP to advertise the on-premises CIDR to the VPC
Routes must be exchanged over the VIF for the VPC to know how to reach on-premises.
- D
Create a public virtual interface (VIF) on the Direct Connect connection
Why wrong: Public VIF is for accessing AWS public services, not private VPC communication.
- E
Create a Direct Connect Gateway to connect the VPC to the on-premises network
Why wrong: Direct Connect Gateway is used for multi-VPC or multi-Region scenarios, but not required for a single VPC.
ANS-C01 Network Design Practice Question
This ANS-C01 practice question tests your understanding of network design. 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 designing a hybrid network using AWS Direct Connect. They have a VPC with a CIDR of 10.0.0.0/16 and an on-premises network with CIDR 10.0.0.0/8. The company needs to ensure that traffic from the VPC to the on-premises network uses the Direct Connect connection and that traffic does not traverse the internet. Which TWO actions are required? (Choose TWO.)
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
Create a private virtual interface (VIF) on the Direct Connect connection
Options B and D are correct. Option B is correct because a Private VIF is required for private IP communication. Option D is correct because static routes or BGP advertise the on-premises CIDR over the VIF. Option A is wrong because a Public VIF is for internet-routable IPs. Option C is wrong because a Direct Connect Gateway is not required for a single VPC. Option E is wrong because Transit Gateway is not required.
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.
- ✗
Attach the VPC to an AWS Transit Gateway
Why it's wrong here
Transit Gateway is optional and not required for a simple Direct Connect setup with one VPC.
- ✓
Create a private virtual interface (VIF) on the Direct Connect connection
- ✓
Configure static routes or BGP to advertise the on-premises CIDR to the VPC
Why this is correct
Routes must be exchanged over the VIF for the VPC to know how to reach on-premises.
Related concept
CIDR notation defines the prefix length.
- ✗
Create a public virtual interface (VIF) on the Direct Connect connection
Why it's wrong here
Public VIF is for accessing AWS public services, not private VPC communication.
- ✗
Create a Direct Connect Gateway to connect the VPC to the on-premises network
Why it's wrong here
Direct Connect Gateway is used for multi-VPC or multi-Region scenarios, but not required for a single VPC.
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.
Trap categories for this question
Scenario analysis trap
Direct Connect Gateway is used for multi-VPC or multi-Region scenarios, but not required for a single VPC.
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 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.
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.
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FAQ
Questions learners often ask
What does this ANS-C01 question test?
Network Design — This question tests Network Design — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: Create a private virtual interface (VIF) on the Direct Connect connection — Options B and D are correct. Option B is correct because a Private VIF is required for private IP communication. Option D is correct because static routes or BGP advertise the on-premises CIDR over the VIF. Option A is wrong because a Public VIF is for internet-routable IPs. Option C is wrong because a Direct Connect Gateway is not required for a single VPC. Option E is wrong because Transit Gateway is not required.
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.
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Last reviewed: Jun 20, 2026
This ANS-C01 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the ANS-C01 exam.
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