You are designing a highly available web application on Compute Engine. The application must automatically scale out during traffic spikes and scale in during quiet periods to save costs. If a VM crashes, it must be automatically recreated. Which GCP feature should you use?

Answer options:

Unmanaged Instance Groups

Managed Instance Groups (MIGs)

Cloud Run

Compute Engine Autoscaler API

How to approach this question

Identify the Compute Engine feature that provides identical VMs, autoscaling, and autohealing.

Full Answer

B.Managed Instance Groups (MIGs)✓ Correct

Managed Instance Groups (MIGs) are the foundation of scalable and highly available VM-based architectures in GCP. By defining an Instance Template, the MIG can automatically spin up new identical VMs when load increases (autoscaling) and recreate VMs if the application stops responding to health checks (autohealing).

Common mistakes

Choosing Unmanaged Instance Groups (Option A). These are only used for legacy load balancing scenarios where you need different types of VMs in the same group.

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