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 has deployed a VPC with public and private subnets. They have an Internet Gateway attached to the VPC and a NAT Gateway in the public subnet. The private subnet instances need to download patches from the internet. Which configuration ensures that the private instances can reach the internet while preventing inbound traffic from the internet?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Add a route in the private subnet route table pointing 0.0.0.0/0 to the NAT Gateway.
Option A is correct because a route to the NATGateway allows outbound traffic to the internet, and the NAT Gateway does not allow inbound traffic initiated from the internet. Option B is wrong because an Internet Gateway would allow inbound traffic. Option C is wrong because a VPC Gateway Endpoint is for specific AWS services like S3 and DynamoDB, not general internet access. Option D is wrong because a VPC Peering connection does not provide internet access.
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.
✗
Add a VPC Gateway Endpoint for Amazon S3 to the private subnet route table.
Why it's wrong here
Gateway Endpoints only provide private access to specific AWS services, not general internet access.
✗
Add a route in the private subnet route table pointing 0.0.0.0/0 to the Internet Gateway.
Why it's wrong here
Internet Gateway allows inbound traffic, which violates security requirements.
✓
Add a route in the private subnet route table pointing 0.0.0.0/0 to the NAT Gateway.
Why this is correct
NATGateway allows outbound traffic to the internet and blocks unsolicited inbound traffic.
Create a VPC Peering connection to a public VPC and route traffic through it.
Why it's wrong here
VPC Peering does not provide internet access; it only connects VPCs privately.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
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 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: Add a route in the private subnet route table pointing 0.0.0.0/0 to the NAT Gateway. — Option A is correct because a route to the NAT Gateway allows outbound traffic to the internet, and the NAT Gateway does not allow inbound traffic initiated from the internet. Option B is wrong because an Internet Gateway would allow inbound traffic. Option C is wrong because a VPC Gateway Endpoint is for specific AWS services like S3 and DynamoDB, not general internet access. Option D is wrong because a VPC Peering connection does not provide internet access.
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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