Azure Load Balancer continuously probes each backend pool instance on a specified port or path. It forwards new connections only to instances that respond successfully to these health probes. Instances that fail the probe are marked unhealthy and are excluded from load-balancing until they pass the probe again. This mechanism prevents traffic from being routed to non-operational virtual machines and helps maintain application availability.
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Microsoft Azure Administrator Associate AZ-104
Configure and manage virtual networking
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