The answer is that adding a route in the VPC route tables pointing to the Virtual Private Gateway for the on-premises CIDR is required, along with attaching a VGW to the VPC. This is because the VGW serves as the AWS-side VPN concentrator that terminates the two tunnels, while the route tables must contain a static route for the 192.168.0.0/16 network with the VGW as the target to enable traffic flow from the VPC to the on-premises network. On the AWS Certified Advanced Networking Specialty ANS-C01 exam, this question tests your understanding of the fundamental Site-to-Site VPN setup components, often appearing as a trap where candidates mistakenly select Customer Gateway or Direct Connect. A common memory tip is to remember that the VGW is the AWS-side anchor, and the route table entry is the traffic director—without both, the VPN is just a dead tunnel. Mnemonic: "VGW and Route, the VPN route."
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 has a VPC with a CIDR block of 10.0.0.0/16 and needs to establish connectivity to an on-premises network via AWS Site-to-Site VPN. The on-premises network uses a CIDR block of 192.168.0.0/16. The VPN connection will be redundant using two tunnels. Which TWO actions are required to enable this connectivity?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create a Virtual Private Gateway (VGW) and attach it to the VPC.
Option A and Option D are correct. Option A is correct because a Virtual Private Gateway must be attached to the VPC. Option D is correct because route tables must have routes for the on-premises CIDR pointing to the VPN gateway. Option B is wrong because Customer Gateway is the on-premises device, not an AWS resource. Option C is wrong because Direct Connect is a different service. Option E is wrong because NAT Gateway is for outbound internet.
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.
✗
Create a Customer Gateway (CGW) in the same AWS region.
Why it's wrong here
CGW represents the on-premises device, not required for AWS side.
✗
Create a Direct Connect virtual interface.
Why it's wrong here
Direct Connect is a separate service.
✓
Create a Virtual Private Gateway (VGW) and attach it to the VPC.
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 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.
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: Create a Virtual Private Gateway (VGW) and attach it to the VPC. — Option A and Option D are correct. Option A is correct because a Virtual Private Gateway must be attached to the VPC. Option D is correct because route tables must have routes for the on-premises CIDR pointing to the VPN gateway. Option B is wrong because Customer Gateway is the on-premises device, not an AWS resource. Option C is wrong because Direct Connect is a different service. Option E is wrong because NAT Gateway is for outbound internet.
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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Question Discussion
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