- A
Add an Internet Gateway to the private subnet's route table.
Why wrong: Incorrect because private subnets should not have direct internet access.
- B
Deploy a NAT Gateway in a public subnet.
Correct because the NAT Gateway must be in a public subnet to access the internet.
- C
Assign a public IP address to the EC2 instance.
Why wrong: Incorrect because the instance is in a private subnet and should not have a public IP.
- D
Attach an Internet Gateway to the NAT Gateway.
Why wrong: Incorrect because the Internet Gateway is attached to the VPC, not to the NAT Gateway.
- E
Add a route in the private subnet's route table pointing to the NAT Gateway for 0.0.0.0/0.
Correct because the private subnet routes internet traffic to the NAT Gateway.
SOA-C02 Networking and Content Delivery Practice Question
This SOA-C02 practice question tests your understanding of networking and content delivery. 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 public subnet and a private subnet. The private subnet contains an EC2 instance that must access the internet for software updates. Which TWO actions are required to enable this? (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
Deploy a NAT Gateway in a public subnet.
Option A is correct because a NAT Gateway must be in a public subnet. Option C is correct because the private subnet's route table must have a default route to the NAT Gateway. Option B is wrong because the NAT Gateway does not need an Internet Gateway; the public subnet does. Option D is wrong because the EC2 instance does not need a public IP. Option E is wrong because an Internet Gateway is for public subnets, not private.
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 an Internet Gateway to the private subnet's route table.
Why it's wrong here
Incorrect because private subnets should not have direct internet access.
- ✓
Deploy a NAT Gateway in a public subnet.
- ✗
Assign a public IP address to the EC2 instance.
Why it's wrong here
Incorrect because the instance is in a private subnet and should not have a public IP.
- ✗
Attach an Internet Gateway to the NAT Gateway.
- ✓
Add a route in the private subnet's route table pointing to the NAT Gateway for 0.0.0.0/0.
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.
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 SOA-C02 subnetting questions on CIDR, address ranges, and subnet selection.
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FAQ
Questions learners often ask
What does this SOA-C02 question test?
Networking and Content Delivery — This question tests Networking and Content Delivery — 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. — Option A is correct because a NAT Gateway must be in a public subnet. Option C is correct because the private subnet's route table must have a default route to the NAT Gateway. Option B is wrong because the NAT Gateway does not need an Internet Gateway; the public subnet does. Option D is wrong because the EC2 instance does not need a public IP. Option E is wrong because an Internet Gateway is for public subnets, not private.
What should I do if I get this SOA-C02 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 SOA-C02 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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