- A
Bastion security group: inbound SSH from the private instance security group. Private instance security group: inbound SSH from the bastion security group.
Why wrong: The bastion host should not accept inbound from the private instance; it should accept from the user.
- B
Bastion security group: inbound SSH from the private instance security group. Private instance security group: inbound SSH from the IP range.
Why wrong: This reverses the roles and exposes the private instance to the internet directly.
- C
Bastion security group: inbound SSH from the IP range. Private instance security group: inbound SSH from the IP range.
Why wrong: The private instance should only be accessible from the bastion, not directly from the IP range.
- D
Bastion security group: inbound SSH from the IP range. Private instance security group: inbound SSH from the bastion security group.
This follows the principle of least privilege.
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 wants to allow a specific IP address range to access an EC2 instance in a private subnet using a bastion host. The bastion host is in a public subnet. Which security group configuration is correct?
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
Bastion security group: inbound SSH from the IP range. Private instance security group: inbound SSH from the bastion security group.
Option A is correct because the bastion host should allow SSH from the IP range, and the private instance should allow SSH only from the bastion host's security group. Option B is wrong because the bastion host should not allow SSH from the private instance. Option C is wrong because the private instance should not allow SSH from the internet. Option D is wrong because the bastion host should not allow SSH from the private instance.
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.
- ✗
Bastion security group: inbound SSH from the private instance security group. Private instance security group: inbound SSH from the bastion security group.
Why it's wrong here
The bastion host should not accept inbound from the private instance; it should accept from the user.
- ✗
Bastion security group: inbound SSH from the private instance security group. Private instance security group: inbound SSH from the IP range.
Why it's wrong here
This reverses the roles and exposes the private instance to the internet directly.
- ✗
Bastion security group: inbound SSH from the IP range. Private instance security group: inbound SSH from the IP range.
Why it's wrong here
The private instance should only be accessible from the bastion, not directly from the IP range.
- ✓
Bastion security group: inbound SSH from the IP range. Private instance security group: inbound SSH from the bastion security group.
Why this is correct
This follows the principle of least privilege.
Related concept
CIDR notation defines the prefix length.
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 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: Bastion security group: inbound SSH from the IP range. Private instance security group: inbound SSH from the bastion security group. — Option A is correct because the bastion host should allow SSH from the IP range, and the private instance should allow SSH only from the bastion host's security group. Option B is wrong because the bastion host should not allow SSH from the private instance. Option C is wrong because the private instance should not allow SSH from the internet. Option D is wrong because the bastion host should not allow SSH from the private instance.
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
This ANS-C01 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the ANS-C01 exam.
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