Describe the Why and How of Caching in NGINX F5N2 Practice Questions (Page 4)

Questions 16–20

1. 16foundation · easy

   What is the first step NGINX performs when it receives a request for a resource that might be cached?

   • AIt forwards the request to the origin server to check if the content has changed
   • BIt computes the cache key and looks up the response in the cache
   • CIt sends the request to the origin server and stores the response only if the origin allows it
   • DIt compresses the response before storing it in the cache
   Reveal Solution Discussion Select an answer first
2. 17foundation · easy

   What is the default cache key that NGINX uses to identify a cached response?

   • AThe full request URL (including query string)
   • BThe response's ETag header
   • CThe client's IP address
   • DThe request method and the URI without the query string
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4. 18application · medium

   A team configures NGINX caching with `proxy_cache_valid 200 1h;` and `proxy_cache_use_stale error timeout;`. The origin server becomes temporarily unavailable. What will NGINX do for a request to a previously cached resource?

   • AReturn a 502 Bad Gateway error to the client.
   • BServe the stale response only if the client sends a `Cache-Control: max-stale` header.
   • CServe the stale cached response because the origin is returning an error.
   • DWait for the origin to recover and then serve the fresh response.
   Reveal Solution Discussion Select an answer first
5. 19expert · hard

   A news site uses NGINX caching with `proxy_cache_valid 200 10m;`. During a major event, the origin server becomes slow but does not return errors. Users are experiencing delays because NGINX waits for the origin to respond on every cache miss. The team wants to improve perceived performance without significantly increasing stale content risk. What should they do?

   • AIncrease `proxy_cache_valid` to 1 hour to reduce the frequency of cache misses.
   • BConfigure `proxy_cache_background_update on;` to refresh the cache without serving stale content.
   • CEnable `proxy_cache_use_stale updating;` so NGINX serves the stale response while refreshing the cache in the background.
   • DSet `proxy_cache_lock on;` to prevent multiple requests from hitting the origin simultaneously.
   Reveal Solution Discussion Select an answer first
6. 20application · easy

   A video streaming platform uses NGINX to cache video segments. The origin server's bandwidth costs are very high. Which benefit of caching directly addresses this concern?

   • AImproved video quality because caching compresses the segments.
   • BReduced origin bandwidth usage because popular segments are served from the cache.
   • CIncreased origin bandwidth usage because NGINX preloads all segments.
   • DEliminated need for origin storage because all content is stored in the cache.
   Reveal Solution Discussion Select an answer first