- A
VPC Peering
Why wrong: VPC peering connects different VPCs, not subnets within a VPC.
- B
Network ACL (NACL)
NACLs are stateless firewalls at subnet level.
- C
Internet Gateway
Why wrong: Internet gateway allows traffic to/from internet, not between subnets.
- D
Route Table
Why wrong: Route tables direct traffic, but do not filter.
- E
Security Group
Security groups are stateful firewalls attached to instances.
Question 408 of 1,000
mediumMultiple SelectObjective-mapped
CCSP Is designing a VPC with multiple tiers Practice Question
This CCSP practice question tests your understanding of is designing a vpc with multiple tiers. 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.
An organization is designing a VPC with multiple tiers. Which TWO network components are used to restrict traffic between subnets?
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
✓
Network ACL (NACL)
Network ACLs (stateless) and Security Groups (stateful) can be applied at subnet and instance level to control 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.
- ✗
VPC Peering
Why it's wrong here
VPC peering connects different VPCs, not subnets within a VPC.
- ✓
Network ACL (NACL)
Why this is correct
NACLs are stateless firewalls at subnet level.
Related concept
CIDR notation defines the prefix length.
- ✗
Internet Gateway
Why it's wrong here
Internet gateway allows traffic to/from internet, not between subnets.
- ✗
Route Table
Why it's wrong here
Route tables direct traffic, but do not filter.
- ✓
Security Group
Why this is correct
Security groups are stateful firewalls attached to instances.
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 security analyst at a medium-sized enterprise encounters this scenario during an investigation or architecture review. The correct answer reflects best practice for the specific threat or control described. Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets. Security exam questions test whether you can match controls to threats in context — not just recall definitions.
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 CCSP subnetting questions on CIDR, address ranges, and subnet selection.
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FAQ
Questions learners often ask
What does this CCSP question test?
CIDR notation defines the prefix length.
What is the correct answer to this question?
The correct answer is: Network ACL (NACL) — Network ACLs (stateless) and Security Groups (stateful) can be applied at subnet and instance level to control traffic.
What should I do if I get this CCSP 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 CCSP 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: Jul 4, 2026
This CCSP practice question is part of Courseiva's free ISC2 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 CCSP exam.
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