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CAS-004 Practice Question: A security architect is designing a network…
A security architect is designing a network segmentation strategy for a multi-tenant cloud environment. Which of the following is the MOST effective technique to isolate tenant workloads while maintaining manageability?
⚠ Common exam trap
A common mix-up: candidates confuse VLAN tagging (a legacy on-premises technique) with cloud-native VPCs, failing to recognize that VLANs cannot provide the scale, automation, or multi-region isolation required in a modern multi-tenant cloud environment.
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
✓
Virtual private clouds (VPCs) with separate subnets
Virtual private clouds (VPCs) with separate subnets provide native, tenant-level isolation in a multi-tenant cloud environment by creating logically isolated network segments with their own IP address space, routing tables, and security policies. This approach is the most effective because it scales easily, integrates with cloud-native security controls (e.g., security groups, network ACLs), and maintains manageability through centralized orchestration without requiring per-tenant hardware or complex overlay configurations.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Host-based iptables
Why it's wrong here
Host-based firewalls are difficult to manage at scale and do not isolate network traffic effectively.
- ✗
Stateful firewall rules
Why it's wrong here
Firewall rules are important but not sufficient as a primary segmentation technique.
- ✓
Virtual private clouds (VPCs) with separate subnets
Why this is correct
VPCs provide scalable, logical isolation in cloud environments.
- ✗
VLAN tagging
Why it's wrong here
VLAN tagging requires careful management across physical switches and is less flexible in cloud environments.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This CAS-005 practice question is part of Courseiva's free CompTIA 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 CAS-005 exam.