- A
VPC: A virtual network dedicated to your AWS account.
This is the correct definition of a Virtual Private Cloud (VPC).
- B
Subnet: A segment of a VPC's IP address range where you place resources.
This correctly describes a subnet as a subdivision within a VPC.
- C
Security Group: A virtual firewall that controls inbound and outbound traffic at the instance level.
Security groups are stateful and operate at the instance level.
- D
NACL: A stateless firewall that controls inbound and outbound traffic at the subnet level.
Network ACLs are stateless and operate at the subnet level.
- E
Security Group: A stateless firewall that controls traffic at the subnet level.
Why wrong: Incorrect — this describes a Network ACL (NACL), not a Security Group.
- F
NACL: A virtual firewall that controls traffic at the instance level.
Why wrong: Incorrect — this describes a Security Group, not a NACL.
DEA-C01 Data Security and Governance Practice Question
This DEA-C01 practice question tests your understanding of data security and governance. 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.
Match each AWS networking concept to its definition.
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
VPC: A virtual network dedicated to your AWS account.
Networking fundamentals for AWS: VPC is a virtual network, subnets are subdivisions, security groups are instance-level firewalls, and NACLs are subnet-level stateless firewalls.
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.
- ✓
VPC: A virtual network dedicated to your AWS account.
Why this is correct
This is the correct definition of a Virtual Private Cloud (VPC).
Related concept
CIDR notation defines the prefix length.
- ✓
Subnet: A segment of a VPC's IP address range where you place resources.
Why this is correct
This correctly describes a subnet as a subdivision within a VPC.
Related concept
CIDR notation defines the prefix length.
- ✓
Security Group: A virtual firewall that controls inbound and outbound traffic at the instance level.
Why this is correct
Security groups are stateful and operate at the instance level.
Related concept
CIDR notation defines the prefix length.
- ✓
NACL: A stateless firewall that controls inbound and outbound traffic at the subnet level.
Why this is correct
Network ACLs are stateless and operate at the subnet level.
Related concept
CIDR notation defines the prefix length.
- ✗
Security Group: A stateless firewall that controls traffic at the subnet level.
Why it's wrong here
Incorrect — this describes a Network ACL (NACL), not a Security Group.
- ✗
NACL: A virtual firewall that controls traffic at the instance level.
Why it's wrong here
Incorrect — this describes a Security Group, not a NACL.
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 healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
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 DEA-C01 subnetting questions on CIDR, address ranges, and subnet selection.
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FAQ
Questions learners often ask
What does this DEA-C01 question test?
Data Security and Governance — This question tests Data Security and Governance — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: VPC: A virtual network dedicated to your AWS account. — Networking fundamentals for AWS: VPC is a virtual network, subnets are subdivisions, security groups are instance-level firewalls, and NACLs are subnet-level stateless firewalls.
What should I do if I get this DEA-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 DEA-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 11, 2026
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