Google Professional Cloud Network Engineer Question 429
Select 4Google Cloud PlatformYou are configuring a load balancer in Google Cloud to distribute traffic to a group of virtual machine (VM) instances in a managed instance group. To ensure only healthy instances receive traffic, you need to create a health check. Which of the following factors must be configured correctly in the health check for it to work with the backend service?
- A
The health check's protocol must match the protocol used by the backend service (e.g., HTTP, HTTPS, TCP).
- B
The firewall rules must allow traffic from the load balancer's health check probes to the target instances.
- C
The health check must include a custom header to pass authentication credentials to the backend service.
- D
The health check's port must match the port used by the backend service for receiving traffic.
- E
The health check interval and timeout values should be adjusted based on the expected response time of the backend service.
Show answer and explanation
Correct answers: A, B, D, E
Explanation
To ensure a functional health check for your backend service, the protocol and port must match the backend service's configuration. Firewall rules must allow traffic from the health check probes to reach the instances. Additionally, configuring appropriate interval and timeout values helps maintain accurate health assessments. Custom headers are not required for basic health checks and are not part of their intended functionality.
- A. Correct.
Correct. The health check's protocol must align with the protocol used by the backend service to properly assess the instance's health.
- B. Correct.
Correct. Without proper firewall rules, the health check probes from the load balancer will be blocked, preventing health verification.
- C. Incorrect.
Incorrect. Health checks do not require custom headers for authentication purposes. They are designed to probe the service's health, not authenticate.
- D. Correct.
Correct. The health check must target the correct port used by the backend service; otherwise, the health check will fail to communicate with the service.
- E. Correct.
Correct. The interval and timeout values should reflect the backend service's expected response time to avoid false positives or negatives in health status.