You have an Azure virtual network named VNet1 that contains three subnets named Subnet1, Subnet2...

Source: ASG1; Destination: ASG2

The requirement is identity-stable network filtering between virtual machines even if VM2 receives a different private IP address. Application security groups solve exactly that problem: rules refer to VM membership instead of a fixed IP. Because VM2 is a member of ASG1 and VM3 is a member of ASG2, the inbound allow rule on the shared NSG must use ASG1 as source and ASG2 as destination. Choosing IP addresses would fail the change-resilience requirement. The important exam skill is separating data-plane access, management-plane administration, and network reachability. A storage, database, or firewall setting must be selected because it enforces the exact path requested in the scenario. Distractors often look plausible because they improve security generally, but they do not satisfy the protocol, scope, or automation requirement stated in the question. The result is a direct exam-style implementation choice: it changes the required security behavior without relying on unrelated monitoring, manual cleanup, or excessive privilege. Official Microsoft source/topic: SC-500 Study Guide > NSGs and ASGs; Microsoft Learn > Application security groups in network security rules.

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