This PAS-C01 practice question tests your understanding of technology. 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 runs SAP on EC2 instances in a private subnet. The instances need to download patches from the internet but must not be directly accessible from the internet. Which configuration meets these requirements?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Deploy a NAT Gateway in a public subnet and route traffic from the private subnet to it
Option C is correct because a NATGateway in a public subnet allows outbound traffic while blocking inbound. Option A is incorrect because an Internet Gateway allows inbound traffic. Option B is incorrect because a VPN does not provide internet access. Option D is incorrect because a Proxy on a bastion host is more complex and less secure.
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.
✗
Place a proxy server on a bastion host in a public subnet
Why it's wrong here
This adds complexity and the bastion host could be a security risk.
✗
Attach an Internet Gateway to the VPC and add a route to the private subnet
Why it's wrong here
An Internet Gateway allows inbound connections, violating the requirement.
✗
Use a VPN connection to the on-premises network and route internet traffic through it
Why it's wrong here
VPN provides access to on-premises, not direct internet access.
✓
Deploy a NAT Gateway in a public subnet and route traffic from the private subnet to it
Why this is correct
NATGateway enables outbound internet traffic while blocking inbound.
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 PAS-C01 subnetting questions on CIDR, address ranges, and subnet selection.
Technology — This question tests Technology — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: Deploy a NAT Gateway in a public subnet and route traffic from the private subnet to it — Option C is correct because a NAT Gateway in a public subnet allows outbound traffic while blocking inbound. Option A is incorrect because an Internet Gateway allows inbound traffic. Option B is incorrect because a VPN does not provide internet access. Option D is incorrect because a Proxy on a bastion host is more complex and less secure.
What should I do if I get this PAS-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 PAS-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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