CAS-004 Security Architecture Practice Question
An organization is implementing network segmentation to limit lateral movement. It wants to isolate application tiers at the virtual network level in a cloud environment. Which technology enforces policies on east-west traffic between VMs in different 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
✓
Micro-segmentation
Micro-segmentation uses software-defined policies to control traffic between individual workloads, often implemented via distributed firewalls or network security groups in cloud environments.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Micro-segmentation
Why this is correct
It enables granular control of east-west traffic between workloads.
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Transport Layer Security (TLS)
Why it's wrong here
TLS encrypts data in transit but does not enforce segmentation.
- ✗
Virtual Private Network (VPN)
Why it's wrong here
VPN provides encrypted tunnels for remote access, not internal segmentation.
- ✗
Secure Access Service Edge (SASE)
Why it's wrong here
SASE is a converged network security service for WAN and cloud access.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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