PCNE Implementing a Virtual Private Cloud Practice Question
A startup wants to create a VPC with a subnet that can grow automatically as they add more VM instances. Which subnet type should they use?
⚠ Common exam trap
Google Cloud often tests the distinction between auto mode and custom mode subnets, where candidates mistakenly think 'dynamic subnet' is a real option or assume custom mode can auto-expand, but only auto mode provides automatic regional subnet creation and growth.
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
✓
Auto mode subnet
An auto mode subnet automatically creates subnets in each region and assigns IP address ranges from a predefined pool that can expand as you add more VM instances. This allows the subnet to grow without manual intervention, making it ideal for startups that need dynamic scaling.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Custom mode subnet
Why it's wrong here
Custom mode gives full control but requires manual range expansion.
- ✗
Dynamic subnet
Why it's wrong here
No such subnet mode exists in Google Cloud.
- ✗
Legacy network
Why it's wrong here
Legacy networks are deprecated and not recommended.
- ✓
Auto mode subnet
Why this is correct
Auto mode subnets automatically allocate IP ranges and expand as needed.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This PCNE practice question is part of Courseiva's free Google Cloud 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 PCNE exam.