Specialized Configurations F5N2 Practice Questions (Page 2)

Questions 6–10

1. 6application · medium

   A startup is launching a new public API and wants to protect its backend services from being overwhelmed by excessive requests. The administrator needs to configure NGINX to limit each client IP to a maximum of 10 requests per second. Which configuration directives should be used in the http context?

   • AUse the limit_req_zone directive to define a shared memory zone and the limit_req directive in the location block to enforce the rate
   • BUse the access_log directive with a custom log format to track request rates and manually block abusive IPs
   • CUse the proxy_cache directive with a cache key based on the client IP to throttle requests
   • DUse the limit_conn_zone directive to define a shared memory zone and the limit_conn directive in the location block
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2. 7foundation · easy

   What is the effect of the `burst` parameter in the `limit_req` directive?

   • AIt allows a temporary queue of excess requests to be processed without immediate rejection.
   • BIt defines the shared memory zone size.
   • CIt sets the timeout for queued requests.
   • DIt sets the maximum number of requests that can be processed per second.
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4. 8foundation · easy

   What is the default load balancing method for an upstream group in the stream context?

   • Ahash
   • Brandom
   • Cround_robin
   • Dleast_conn
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5. 9expert · hard

   A social media company runs a public API for posting messages. The API is protected by NGINX rate limiting. The administrator needs to allow authenticated users to make 100 requests per minute, while unauthenticated users are limited to 10 requests per minute. The authentication status is determined by the presence of a valid API key in the request header. Which NGINX configuration approach should be used?

   • AUse the limit_conn directive to limit the number of concurrent connections instead of the request rate
   • BUse a single limit_req_zone with a rate of 100 requests per minute for all users
   • CUse the auth_request directive to authenticate the user and then apply a single limit_req with a rate of 10 requests per minute
   • DUse the map module to set a rate limit key based on the presence of the API key, then use two limit_req zones with different rates
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6. 10foundation · easy

   In which configuration context must the stream block be placed to define layer 4 load balancing?

   • AInside the events block
   • BAt the top level of nginx.conf, outside the http block
   • CInside a server block within the http block
   • DInside the http block
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