Microsoft Certified: Azure Fundamentals (AZ-900) Practice Exam 2026 - Free AZ-900 Practice Questions and Study Guide

Implementing a resource lock on an ExpressRoute circuit is appropriate as it is a critical resource that establishes a private connection between an organization's on-premises network and Azure. Resource locks help prevent accidental deletion or modifications to crucial resources, ensuring operational continuity and maintaining connectivity for business applications. Given that an ExpressRoute circuit can significantly impact network performance and availability, safeguarding it against unintended changes becomes vital for maintaining a stable infrastructure.

In contrast, non-production virtual machines and storage accounts in development environments may not require the same level of protection. These resources are typically used for temporary testing or development purposes, where changes or deletions could be part of the standard workflow. Thus, locking them may hinder flexibility and speed in the development process, which is generally not a concern for more permanent and critical resources like an ExpressRoute circuit.