The answer is microsegmentation, the network design principle that prevents lateral movement after a server compromise by enforcing granular, per-workload firewall rules that restrict east-west traffic between servers. Unlike traditional perimeter-based security, microsegmentation isolates each workload—often using virtual firewalls on each hypervisor or VXLAN/ACL policies—so that even if an attacker compromises one server, they cannot pivot to adjacent hosts unless explicitly permitted. On the CISSP exam, this concept tests your understanding of zero-trust architectures and the shift from network-centric to data-centric security; a common trap is confusing microsegmentation with VLAN segmentation, which operates at Layer 2 and lacks the per-workload granularity needed to block lateral movement. Remember the memory tip: “Micro means minute—think minute, per-server rules that stop the attacker from taking a single step sideways.”
CISSP Communication and Network Security Practice Question
This CISSP practice question tests your understanding of communication and network security. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 for a high-security data center. The requirement is to ensure that even if an attacker compromises one server, they cannot easily move laterally to other servers in the same data center. Which network design principle should be applied?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Microsegmentation (e.g., using virtual firewalls on each hypervisor)
Microsegmentation (D) is the correct network design principle because it enforces granular, per-workload firewall rules—often implemented via virtual firewalls on each hypervisor or using VXLAN/ACL policies—that restrict east-west traffic between servers. Even if an attacker compromises one server, microsegmentation prevents lateral movement by allowing only explicitly permitted inter-server communication, effectively isolating the breach to the compromised host.
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.
✗
Principle of least privilege
Why it's wrong here
Least privilege applies to user permissions, not directly to network segmentation between servers.
✗
Defense in depth
Why it's wrong here
Defense in depth is a strategy using multiple layers, but it does not specifically isolate lateral movement.
✗
Single point of failure elimination
Why it's wrong here
This addresses availability, not preventing lateral movement.
✓
Microsegmentation (e.g., using virtual firewalls on each hypervisor)
Why this is correct
Microsegmentation divides the network into small, isolated zones to contain threats and block lateral movement.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse the broad strategy of defense in depth (B) with the specific technical mechanism of microsegmentation, but the question explicitly asks for a network design principle that prevents lateral movement, which is exactly what microsegmentation enforces at the data center network layer.
Detailed technical explanation
How to think about this question
Microsegmentation leverages technologies such as VMware NSX distributed firewalls, Cisco ACI endpoint groups, or Kubernetes network policies to enforce zero-trust east-west traffic rules at the virtual NIC or hypervisor level. Each workload is placed in a logical microsegment with a whitelist of allowed flows, often using VXLAN encapsulation and stateful inspection, so that even if an attacker pivots from a compromised server, all other segments remain unreachable unless explicitly permitted. In real-world deployments, this prevents ransomware from spreading across a data center by containing the blast radius to a single microsegment.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CISSP question in full detail.
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: Microsegmentation (e.g., using virtual firewalls on each hypervisor) — Microsegmentation (D) is the correct network design principle because it enforces granular, per-workload firewall rules—often implemented via virtual firewalls on each hypervisor or using VXLAN/ACL policies—that restrict east-west traffic between servers. Even if an attacker compromises one server, microsegmentation prevents lateral movement by allowing only explicitly permitted inter-server communication, effectively isolating the breach to the compromised host.
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.
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Question Discussion
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