Microsoft Azure Administrator Associate AZ-104 Practice Question
Your company has deployed a web application hosted on multiple Azure virtual machines in a backend pool behind an Azure Load Balancer. Users report that the application is intermittently unavailable. Upon investigation, you notice that some virtual machines are not receiving any traffic from the load balancer. What is the most likely cause of this issue?
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The health probe configured for the load balancer is failing on some virtual machines.
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The load balancing rules are misconfigured to use an unsupported protocol.
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The public IP address of the load balancer is not configured correctly.
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The virtual network is not properly peered with the load balancer.
The most likely cause is that the health probe configured for the load balancer is failing on some virtual machines. Azure Load Balancer uses health probes to determine the health of instances in the backend pool. If a health probe fails on a VM, the load balancer stops sending traffic to that VM until it responds to the probe again. Common issues causing health probe failures include the application not listening on the probe port or protocol, or firewall rules blocking the probe traffic.
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What is a health probe in the context of Azure Load Balancer?
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What can cause health probe failures on virtual machines?
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How do I configure health probes for an Azure Load Balancer?
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Microsoft Azure Administrator Associate AZ-104
Configure and manage virtual networking
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