Enable the Cache F5N2 Practice Questions (Page 2)

Questions 6–10

1. 6application · medium

   An e-commerce site uses NGINX to cache product pages. Each product has a unique ID in the URI, but the same product can be accessed via HTTP or HTTPS. The team wants to avoid serving an HTTPS-cached response to an HTTP request. Which proxy_cache_key configuration achieves this?

   • Aproxy_cache_key "$host$request_uri";
   • Bproxy_cache_key "$request_uri";
   • Cproxy_cache_key "$scheme$request_uri";
   • Dproxy_cache_key "$uri$is_args$args";
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2. 7foundation · easy

   What is the purpose of the proxy_cache_bypass directive in NGINX?

   • ATo force requests to be forwarded to the upstream server without checking the cache
   • BTo prevent responses from being stored in the cache
   • CTo clear the cache when a specific condition is met
   • DTo set the duration for which a response remains in the cache
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4. 8expert · hard

   A company's backend occasionally returns 500 errors under load. The team wants to cache 200 responses for 10 minutes, but they also want to avoid caching 500 errors. However, they notice that when the backend recovers, users still see cached 500 errors. What is the likely cause and solution?

   • AThe proxy_cache_bypass is not set, so 500 errors are cached. Add 'proxy_cache_bypass $status'.
   • BThe proxy_cache_lock is enabled, causing 500 errors to be cached. Disable proxy_cache_lock.
   • CThe proxy_cache_valid directive is set to 'any 10m', caching all responses. Change it to 'proxy_cache_valid 200 10m'.
   • DThe proxy_cache_revalidate is disabled, so stale 500 errors are not revalidated. Enable proxy_cache_revalidate.
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5. 9application · hard

   A company's staging environment uses the same NGINX configuration as production. They want to disable caching when the request comes from the staging domain 'staging.example.com' but keep caching for production. Which configuration achieves this?

   • Aproxy_cache_bypass $http_host;
   • Bset $bypass ''; if ($host = 'staging.example.com') { set $bypass 1; } proxy_cache_bypass $bypass;
   • Cproxy_cache_bypass $host;
   • Dproxy_cache_bypass $host = 'staging.example.com';
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6. 10foundation · easy

   What does the proxy_cache_revalidate directive do when a cached response has expired?

   • AIt extends the cache validity by the original duration automatically
   • BIt forces the upstream to always return a full response regardless of cache headers
   • CIt immediately removes the expired entry from the cache
   • DIt sends a conditional request to the upstream to check if the cached response is still valid
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