Microsoft Certified Azure Network Engineer Associate · Free Practice Question Medium
Question 1
When using Azure Application Gateway Probes, which IP address is used by the Application Gateway as the source IP for health probes if you have a group of backend servers with public IP addresses?
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A
Application Gateway's backend public IP address
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B
Application Gateway's backend private IP address
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C
Application Gateway's frontend public IP address
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D
Application Gateway's frontend private IP address
Reveal correct answer
Correct answer: C
Explanation
An Application Gateway maintains the health of all resources available in its backend pool by performing regular checks. If any resource is found to be unhealthy, it is removed automatically. The source IP address used by the Application Gateway for health probes depends upon the backend pool. Suppose a server address in the backend pool has a public endpoint. In that case, the source IP address used by the Application Gateway is the frontend public IP address of the Application Gateway. However, if the server address has a private endpoint, the source IP address used by the Application Gateway is from the private IP address space of the Application Gateway subnet.
Options A and B are incorrect since the Application Gateway does not use a backend IP address as the source IP address.
The correct option is C, which states that if the server address has a public endpoint in the backend pool, the source address used by the Application Gateway is the frontend public IP address of the Application Gateway.
Option D is also incorrect since the frontend private IP address of the Application Gateway is not the correct answer.
For more information on Azure Application Gateway, visit the link provided below:
Azure Application Gateway configuration overview | Microsoft Learn
Discussion
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