- A
VPN connection
Why wrong: VPN is not needed if using Direct Connect.
- B
Route tables with specific routes
Route tables ensure traffic from on-premises is directed to the correct VPC subnet.
- C
Public virtual interface (VIF)
Why wrong: Public VIF is for accessing public AWS services, not VPC subnets.
- D
Private virtual interface (VIF)
A private VIF is required for accessing VPCs via Direct Connect.
- E
Transit virtual interface (VIF)
Why wrong: Transit VIF is for use with a transit gateway, not for a single VPC subnet.
Question 1,279 of 1,705
ANS-C01 Network Security, Compliance and Governance Practice Question
This ANS-C01 practice question tests your understanding of network security, compliance and governance. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 using AWS Direct Connect to connect their on-premises network to AWS. They need to ensure that traffic from a specific on-premises subnet can only access a specific VPC subnet. Which two components must be configured? (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
✓
Route tables with specific routes
To restrict traffic from a specific on-premises subnet to a specific VPC subnet using AWS Direct Connect, you need two components. First, a private virtual interface (VIF) is required because it provides connectivity to VPCs (as opposed to public or transit VIFs). Second, route tables with specific routes must be configured on both the on-premises router and the VPC route tables to ensure that traffic is directed to the correct destination subnet. Option B (Route tables with specific routes) and Option D (Private virtual interface) are correct. Option A (VPN connection) is not needed because Direct Connect itself provides the private connectivity. Option C (Public virtual interface) is incorrect as it is used for accessing public AWS endpoints, not VPC subnets. Option E (Transit virtual interface) is used for connecting to multiple VPCs via a transit gateway, not for a single VPC subnet.
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.
- ✗
VPN connection
Why it's wrong here
VPN is not needed if using Direct Connect.
- ✓
Route tables with specific routes
Why this is correct
Route tables ensure traffic from on-premises is directed to the correct VPC subnet.
Related concept
CIDR notation defines the prefix length.
- ✗
Public virtual interface (VIF)
Why it's wrong here
Public VIF is for accessing public AWS services, not VPC subnets.
- ✓
Private virtual interface (VIF)
Why this is correct
A private VIF is required for accessing VPCs via Direct Connect.
Related concept
CIDR notation defines the prefix length.
- ✗
Transit virtual interface (VIF)
Why it's wrong here
Transit VIF is for use with a transit gateway, not for a single VPC subnet.
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.
Visual reference
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 Security, Compliance and Governance — This question tests Network Security, Compliance and Governance — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: Route tables with specific routes — To restrict traffic from a specific on-premises subnet to a specific VPC subnet using AWS Direct Connect, you need two components. First, a private virtual interface (VIF) is required because it provides connectivity to VPCs (as opposed to public or transit VIFs). Second, route tables with specific routes must be configured on both the on-premises router and the VPC route tables to ensure that traffic is directed to the correct destination subnet. Option B (Route tables with specific routes) and Option D (Private virtual interface) are correct. Option A (VPN connection) is not needed because Direct Connect itself provides the private connectivity. Option C (Public virtual interface) is incorrect as it is used for accessing public AWS endpoints, not VPC subnets. Option E (Transit virtual interface) is used for connecting to multiple VPCs via a transit gateway, not for a single VPC subnet.
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
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