Describe How Open Source NGINX Handles Health Checks in Different Situations F5N2 Practice Questions (Page 2)

Questions 6–10

1. 6foundation · easy

   How does open source NGINX perform passive health checks?

   • ABy sending periodic synthetic requests to each upstream server
   • BBy using an external monitoring tool to report server status to NGINX
   • CBy checking the TCP port of each upstream server at regular intervals
   • DBy analyzing the responses to actual client requests and marking a server as failed after consecutive errors or timeouts
   Reveal Solution Discussion Select an answer first
2. 7expert · medium

   A company runs a high-traffic web application with three upstream servers. They have configured max_fails=3 and fail_timeout=30s. During a traffic spike, one server becomes slow and times out on several requests. The other two servers are healthy. What is the most likely impact on users?

   • AUsers will experience intermittent errors because NGINX will continue to send some requests to the slow server until it is marked as failed.
   • BUsers will experience errors only if all three servers fail.
   • CUsers will experience errors because NGINX will send all traffic to the slow server due to load balancing.
   • DUsers will not experience any errors because NGINX will immediately stop sending requests to the slow server.
   Reveal Solution Discussion Select an answer first
4. 8application · medium

   A startup is using open source NGINX as a reverse proxy for a microservices application. They want NGINX to periodically send synthetic requests to each backend to verify health, even when there is no user traffic. They are evaluating their options. Which statement accurately describes what they can do with open source NGINX?

   • AThey can use the nginx -t command to periodically test backend health.
   • BThey can configure active health checks by setting max_fails to a low value and fail_timeout to a short duration.
   • CThey can implement active health checks by using the health_check directive in the upstream block.
   • DThey can use passive health checks, which only detect failures when real client requests are made.
   Reveal Solution Discussion Select an answer first
5. 9foundation · easy

   In a mixed scenario where some upstream servers are healthy and others are marked as failed, how does NGINX handle client requests?

   • AIt continues to send requests to all servers, including failed ones, to test their status
   • BIt sends all requests to the first healthy server in the list
   • CIt returns a 503 Service Unavailable error to all clients
   • DIt distributes requests only among the healthy servers, ignoring the failed ones
   Reveal Solution Discussion Select an answer first
6. 10foundation · easy

   In an upstream block, what is the purpose of the `fail_timeout` directive?

   • AIt specifies the interval between active health check probes
   • BIt defines the time window during which `max_fails` failures must occur to mark a server as down
   • CIt determines how long NGINX waits before retrying a failed request
   • DIt sets the maximum time NGINX will wait for a response from an upstream server
   Reveal Solution Discussion Select an answer first