- A
Configure the RDS instance to use a custom DB parameter group with SSL enabled.
Why wrong: SSL is for encryption, not for access control.
- B
Add a rule to the NACL for the private subnet to allow inbound traffic from the bastion host's IP.
NACL must allow inbound traffic from the bastion to the RDS port.
- C
Assign a public IP address to the RDS instance.
Why wrong: RDS instances typically are not assigned public IPs; they should be private.
- D
Create a route in the public subnet's route table to the RDS instance.
Why wrong: The public subnet route table doesn't need a route to RDS; the bastion already has a route via the local route.
- E
Add a rule to the RDS security group that allows inbound traffic from the bastion host's security group.
This allows the bastion to initiate connections to RDS.
ANS-C01 Network Management and Operations Practice Question
This ANS-C01 practice question tests your understanding of network management and operations. 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 public subnet has a bastion host (EC2) with a security group that allows SSH from a specific IP range. The private subnet has an RDS instance. The company wants to enable the bastion host to connect to the RDS instance. Which TWO steps are required?
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
Add a rule to the NACL for the private subnet to allow inbound traffic from the bastion host's IP.
The bastion host needs network-level access to the RDS instance. The RDS security group must allow inbound from the bastion's security group, and the bastion must be in the same VPC or have network connectivity. The NACL must allow the traffic.
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.
- ✗
Configure the RDS instance to use a custom DB parameter group with SSL enabled.
Why it's wrong here
SSL is for encryption, not for access control.
- ✓
Add a rule to the NACL for the private subnet to allow inbound traffic from the bastion host's IP.
Why this is correct
NACL must allow inbound traffic from the bastion to the RDS port.
Related concept
CIDR notation defines the prefix length.
- ✗
Assign a public IP address to the RDS instance.
Why it's wrong here
RDS instances typically are not assigned public IPs; they should be private.
- ✗
Create a route in the public subnet's route table to the RDS instance.
Why it's wrong here
The public subnet route table doesn't need a route to RDS; the bastion already has a route via the local route.
- ✓
Add a rule to the RDS security group that allows inbound traffic from the bastion host's security group.
Why this is correct
This allows the bastion to initiate connections to RDS.
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.
- →
Network Management and Operations — study guide chapter
Learn the concepts, then practise the questions
- →
Network Management and Operations practice questions
Targeted practice on this topic area only
- →
All ANS-C01 questions
1,705 questions across all exam domains
- →
AWS Certified Advanced Networking Specialty ANS-C01 study guide
Full concept coverage aligned to exam objectives
- →
ANS-C01 practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Related ANS-C01 practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Network Management and Operations practice questions
Practise ANS-C01 questions linked to Network Management and Operations.
Network Security, Compliance and Governance practice questions
Practise ANS-C01 questions linked to Network Security, Compliance and Governance.
Network Design practice questions
Practise ANS-C01 questions linked to Network Design.
Network Implementation practice questions
Practise ANS-C01 questions linked to Network Implementation.
ANS-C01 fundamentals practice questions
Practise ANS-C01 questions linked to ANS-C01 fundamentals.
ANS-C01 scenario practice questions
Practise ANS-C01 questions linked to ANS-C01 scenario.
ANS-C01 troubleshooting practice questions
Practise ANS-C01 questions linked to ANS-C01 troubleshooting.
Practice this exam
Start a free ANS-C01 practice session
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
FAQ
Questions learners often ask
What does this ANS-C01 question test?
Network Management and Operations — This question tests Network Management and Operations — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: Add a rule to the NACL for the private subnet to allow inbound traffic from the bastion host's IP. — The bastion host needs network-level access to the RDS instance. The RDS security group must allow inbound from the bastion's security group, and the bastion must be in the same VPC or have network connectivity. The NACL must allow the traffic.
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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Keep practising
More ANS-C01 practice questions
- A company is designing a network security architecture for a multi-account environment using AWS Transit Gateway. The se…
- A company is using AWS Direct Connect to connect its on-premises network to AWS. The company wants to encrypt all traffi…
- A company uses AWS Transit Gateway to connect multiple VPCs and on-premises networks via AWS Site-to-Site VPN. The secur…
- A global e-commerce company uses a hub-and-spoke network topology with a transit VPC in us-east-1. Each spoke VPC has an…
- A company is designing a multi-VPC architecture in the same region. The VPCs need to communicate with each other using p…
- A company is deploying an application that requires low-latency communication between EC2 instances in two different AWS…
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.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.