- A
Ensure the EC2 instance does not have a public IP address
Without a public IP, internet traffic is not possible even with route.
- B
Remove the route to the internet gateway from the subnet's route table
This removes the direct path to the internet.
- C
Assign a public IP address to the instance
Why wrong: This would increase exposure.
- D
Update the security group to deny outbound traffic to 0.0.0.0/0
Why wrong: Security groups do not control routing.
- E
Attach a NAT gateway to the private subnet
Why wrong: A NAT gateway would still provide internet access.
Question 1,195 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. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 multiple subnets and is using Network Access Analyzer to identify unintended network access. It reports that an EC2 instance in a private subnet has a route to an internet gateway. Which two actions should be taken to remediate this?
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
✓
Ensure the EC2 instance does not have a public IP address
The Network Access Analyzer report indicates that the EC2 instance in a private subnet has an unintended route to an internet gateway. To remediate this, two actions are needed: (1) Remove the route to the internet gateway from the subnet's route table, which eliminates the direct path to the internet. (2) Ensure the EC2 instance does not have a public IP address, because even without a route, a public IP could allow direct internet access via the internet gateway. Option A directly addresses the public IP, and option B fixes the route table. Options C (assigning a public IP) would worsen the issue. Option D (updating security group to deny outbound 0.0.0.0/0) does not affect routing and would not remove the internet gateway route. Option E (attaching a NAT gateway) would add another internet route, not remove the existing one.
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.
- ✓
Ensure the EC2 instance does not have a public IP address
Why this is correct
Without a public IP, internet traffic is not possible even with route.
Related concept
CIDR notation defines the prefix length.
- ✓
Remove the route to the internet gateway from the subnet's route table
Why this is correct
This removes the direct path to the internet.
Related concept
CIDR notation defines the prefix length.
- ✗
Assign a public IP address to the instance
Why it's wrong here
This would increase exposure.
- ✗
Update the security group to deny outbound traffic to 0.0.0.0/0
Why it's wrong here
Security groups do not control routing.
- ✗
Attach a NAT gateway to the private 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: Ensure the EC2 instance does not have a public IP address — The Network Access Analyzer report indicates that the EC2 instance in a private subnet has an unintended route to an internet gateway. To remediate this, two actions are needed: (1) Remove the route to the internet gateway from the subnet's route table, which eliminates the direct path to the internet. (2) Ensure the EC2 instance does not have a public IP address, because even without a route, a public IP could allow direct internet access via the internet gateway. Option A directly addresses the public IP, and option B fixes the route table. Options C (assigning a public IP) would worsen the issue. Option D (updating security group to deny outbound 0.0.0.0/0) does not affect routing and would not remove the internet gateway route. Option E (attaching a NAT gateway) would add another internet route, not remove the existing one.
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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