- A
VLANs (Virtual Local Area Networks)
Why wrong: VLANs provide segmentation but are not fine-grained enough for micro-segmentation; they operate at Layer 2 and are limited to broadcast domains.
- B
Software-Defined Networking (SDN)
SDN enables dynamic, granular control over network flows, allowing per-application or per-tenant segmentation.
- C
Hypervisor-based firewalls
Hypervisors can enforce firewall rules between virtual machines, providing East-West traffic segmentation at a granular level.
- D
Physical network firewalls
Why wrong: Physical firewalls are typically used at perimeter or between zones; not practical for micro-segmentation inside a data center.
- E
DMZ (screened subnet)
Why wrong: DMZ is a specific architecture for public-facing servers, not a micro-segmentation technique.
CISSP Communication and Network Security Practice Question
This CISSP practice question tests your understanding of communication and network security. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 security architect is designing a network segmentation strategy for a financial institution. Which TWO techniques are best suited for implementing micro-segmentation in a data center environment? (Select two.)
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
Software-Defined Networking (SDN)
Software-Defined Networking (SDN) decouples the control plane from the data plane, enabling centralized, programmable network policies. This allows granular, dynamic micro-segmentation at the virtual network level, where traffic flows can be isolated based on application identity or workload attributes, not just IP addresses or VLANs.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
VLANs (Virtual Local Area Networks)
Why it's wrong here
VLANs provide segmentation but are not fine-grained enough for micro-segmentation; they operate at Layer 2 and are limited to broadcast domains.
- ✓
Software-Defined Networking (SDN)
Why this is correct
SDN enables dynamic, granular control over network flows, allowing per-application or per-tenant segmentation.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Hypervisor-based firewalls
Why this is correct
Hypervisors can enforce firewall rules between virtual machines, providing East-West traffic segmentation at a granular level.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Physical network firewalls
Why it's wrong here
Physical firewalls are typically used at perimeter or between zones; not practical for micro-segmentation inside a data center.
- ✗
DMZ (screened subnet)
Why it's wrong here
DMZ is a specific architecture for public-facing servers, not a micro-segmentation technique.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse VLANs (a Layer 2 broadcast domain technique) with micro-segmentation, but VLANs lack the granularity and dynamic policy enforcement needed for workload-level isolation in modern data centers.
Detailed technical explanation
How to think about this question
Micro-segmentation relies on distributed firewalling and policy enforcement at the hypervisor or virtual switch level, often using VXLAN (RFC 7348) for overlay networks that decouple logical segmentation from physical topology. Hypervisor-based firewalls, such as VMware NSX Distributed Firewall, inspect traffic at the vNIC level, allowing policies based on VM names, OS tags, or security groups, and can block lateral movement even within the same subnet. In a real-world scenario, a financial institution can isolate a payment processing VM from a database VM on the same host, enforcing zero-trust principles without any physical firewall reconfiguration.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. 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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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Communication and Network Security — study guide chapter
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FAQ
Questions learners often ask
What does this CISSP question test?
Communication and Network Security — This question tests Communication and Network Security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Software-Defined Networking (SDN) — Software-Defined Networking (SDN) decouples the control plane from the data plane, enabling centralized, programmable network policies. This allows granular, dynamic micro-segmentation at the virtual network level, where traffic flows can be isolated based on application identity or workload attributes, not just IP addresses or VLANs.
What should I do if I get this CISSP question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jul 4, 2026
This CISSP 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 CISSP exam.
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