Describe the Why and How of Caching in NGINX F5N2 Practice Questions (Page 1)

Questions 1–5

1. 1expert · hard

   A company runs a high-traffic API that returns user-specific data. The team wants to use NGINX caching to reduce origin load. What is the most important consideration before enabling caching?

   • ASet a very short `proxy_cache_valid` to minimize the risk of serving stale user data.
   • BDisable caching for all responses that contain sensitive data.
   • CEnsure that the cache key includes user identifiers so that each user's data is cached separately.
   • DUse `proxy_cache_bypass` for all requests that include an `Authorization` header.
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2. 2application · medium

   An NGINX cache serves a mobile app's API. The API returns different JSON for the same URL based on the `Accept-Language` header. How should the cache key be configured to prevent serving the wrong language to users?

   • AUse the `$uri` variable instead of `$request_uri` in the cache key.
   • BSet `proxy_cache_key` to `$scheme$host$uri` and rely on the origin to send `Vary: Accept-Language`.
   • CInclude the `$http_accept_language` variable in the `proxy_cache_key` directive.
   • DDisable caching for all API requests using `proxy_cache off;`.
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4. 3foundation · easy

   Which of the following is a benefit of caching that directly improves the client experience?

   • AReduced latency for cached responses
   • BElimination of the need for a firewall
   • CIncreased security by encrypting cached content
   • DGuaranteed freshness of all content
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5. 4foundation · easy

   When a cached response is stale, what can NGINX do to validate it with the origin server?

   • ASend a conditional request using the ETag or Last-Modified header
   • BServe the stale response to the client and ignore the expiration
   • CDelete the cached response and fetch a fresh one from the origin
   • DExtend the expiration time of the cached response without contacting the origin
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6. 5foundation · easy

   What is a potential drawback of caching content in NGINX?

   • AIt requires clients to authenticate with the origin server for every request
   • BIt can serve stale content to clients if the cache is not properly invalidated
   • CIt prevents NGINX from compressing responses
   • DIt increases the load on the origin server
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