ISC Practice Question: Systems Security Implementation Verification And Validation
As part of validating a cloud environment's security, you need to ensure the network boundary is protected. Which THREE of the following are valid verification tasks?
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
✓
Verify that Security Groups follow the principle of least privilege.
Network security validation in the cloud involves checking security groups, NACLs, and VPC flow logs.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Verify that Security Groups follow the principle of least privilege.
Why this is correct
Restricting security group rules is essential for limiting exposure.
- ✓
Audit VPC Network Access Control List (NACL) rules.
Why this is correct
NACLs provide subnet-level filtering, a key part of cloud network security.
- ✗
Configure the VPC to allow all inbound traffic from 0.0.0.0/0.
Why it's wrong here
This would expose the entire environment to the public internet.
- ✗
Disable the firewall on all EC2 instances to improve performance.
Why it's wrong here
Disabling firewalls is a severe security risk.
- ✓
Enable and review VPC Flow Logs to monitor traffic patterns.
Why this is correct
Flow logs provide visibility into network traffic for security auditing.
About these practice questions
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed August 2026 · checked against the official (ISC)² exam blueprint
This ISC practice question is part of Courseiva's free (ISC)² 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 ISC exam.