ISC Infrastructure And System Security Practice Question
You are auditing a serverless architecture and find that functions are configured to use 'Public' network access. What is the biggest risk?
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
✓
Exposure of the function's endpoint to the public internet.
If a function is not in a private VPC, it cannot interact with internal resources securely and is exposed to potential internet-based discovery and interaction.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Higher cost of execution.
Why it's wrong here
Network configuration does not typically change function execution costs.
- ✗
Inability to use environment variables.
Why it's wrong here
Network access has no impact on environmental variable functionality.
- ✓
Exposure of the function's endpoint to the public internet.
Why this is correct
This exposes the attack surface and prevents internal network isolation.
- ✗
Increased latency.
Why it's wrong here
Latency is not the primary security concern here.
Quick reference
Cloud Service Model Comparison
| Model | You Manage | Provider Manages | Examples |
|---|---|---|---|
| IaaS | OS, runtime, apps, data | Hardware, hypervisor, networking | EC2, Azure VMs, GCP Compute Engine |
| PaaS | Apps and data | OS, runtime, middleware, hardware | Elastic Beanstalk, Azure App Service |
| SaaS | Data and settings only | Everything else | Microsoft 365, Salesforce, Workday |
| FaaS / Serverless | Function code only | Infra, scaling, runtime | Lambda, Azure Functions, Cloud Run |
| CaaS | Containers and apps | Kubernetes, OS, hardware | EKS, AKS, GKE |
About these practice questions
Courseiva writes every ISC question from scratch — 208 in total, each with an explanation and a wrong-answer breakdown. None are copied from real exams or dumps. Learn why practice questions differ from exam dumps →
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.