Describe How and Why NGINX Uses Shared Memory Zones F5N1 Practice Questions (Page 1)

Questions 1–5

1. 1foundation · easy

   What is the correct syntax for defining a shared memory zone for caching?

   • Aproxy_cache /data/cache keys_zone=mycache:10m;
   • Bproxy_cache_path /data/cache levels=1:2 keys_zone=mycache:10m max_size=1g;
   • Cshared_memory_cache /data/cache zone=mycache:10m;
   • Dcache_zone /data/cache size=10m;
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2. 2foundation · easy

   What is the role of the master process in relation to shared memory zones?

   • AIt acts as a proxy for all worker access to the zone
   • BIt creates the shared memory zone and maps it into each worker process
   • CIt stores the zone data in a separate process for isolation
   • DIt periodically copies the zone contents to disk for persistence
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4. 3application · medium

   An NGINX administrator is tuning a server that uses a shared memory zone for caching. They notice that the cache hit rate is lower than expected. What is a likely cause related to the shared memory zone configuration?

   • AThe proxy_cache_valid directive is set too high, causing stale entries to be served.
   • BThe keys_zone is too small, causing cache keys to be evicted before the corresponding data is reused.
   • CThe worker_processes directive is set too low, limiting the number of cache lookups.
   • DThe cache is stored on a slow disk, causing timeouts before the cache can be read.
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5. 4application · medium

   An NGINX administrator is reviewing the configuration of a server that uses shared memory zones for both rate limiting and caching. They notice that the server has 4 GB of RAM and the zones are configured as follows: rate limit zone = 512 MB, cache keys zone = 512 MB. What is the most likely issue with this configuration?

   • AThe zones cannot be used together because they are both defined in the http block.
   • BThe zones must be defined in separate server blocks to avoid conflicts.
   • CThe zones are excessively large for the available RAM, which could lead to memory pressure and performance degradation.
   • DThe zones are too small to be effective for rate limiting and caching.
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6. 5application · medium

   A media streaming company uses NGINX to cache video segments. They have 4 worker processes and notice that some segments are cached multiple times, wasting disk space. What is the most likely cause and the correct fix?

   • AThe worker_processes directive is set to 4, which is too many. Reduce it to 1.
   • BThe cache is configured with proxy_cache_valid 200 1h, which is too short. Increase the validity to 24h.
   • CThe cache keys are not stored in a shared memory zone, so each worker caches the same segment independently. Define a keys_zone in proxy_cache_path.
   • DThe proxy_cache_path directive is missing the use_temp_path parameter. Add use_temp_path=off.
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