Exam AZ-720 topic 5 question 22 discussion

Actual exam question from Microsoft's AZ-720

Question #: 22
Topic #: 5

A company hosts a highly available application using Azure Load Balancer.

A virtual machine (VM) on the backend pool stops responding to health probes. The health probes are configured to use HTTP.

You are troubleshooting the incoming traffic issue. You run a Netsh trace on port 80. No incoming packets are detected on the VM. Outgoing packets are detected.

What is the cause of the issue?

A. A network security group is preventing incoming traffic to the port.
B. A proxy is configured.
C. Session persistence is configured.
D. An application on the VM is blocking the port.

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Suggested Answer: A 🗳️

by terawatt at July 21, 2023, 3:28 p.m.

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terawatt

1 year, 11 months ago

Selected Answer: A

A. A network security group is preventing incoming traffic to the port. The Network Security Group (NSG) could be incorrectly configured to block inbound traffic on port 80, which is used for HTTP. This would prevent the Azure Load Balancer's health probes from reaching the VM, leading to it being marked as unhealthy. Option B, a proxy being configured, would typically not prevent health probes from reaching the VM. Option C, session persistence being configured, should not impact health probes as they would be independent of client sessions. Option D is less likely because if an application on the VM was blocking the port, outgoing packets would likely be affected too, which is not the case as per your description. However, it could be possible if there is some misconfiguration within the application or firewall settings at the OS level. But, in this context, it's more plausible that NSG rules are affecting the inbound traffic.

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