Explain What Is Unique to NGINX as a Web Server F5N2 Practice Questions (Page 4)

Questions 16–20

1. 16expert · hard

   A company serves a large number of small static files (e.g., icons, thumbnails). They are considering enabling `sendfile` to improve performance. However, they notice that `sendfile` does not work as expected when serving files from a network file system (NFS). What is the likely reason?

   • A`sendfile` is disabled by default and must be enabled with a special flag.
   • B`sendfile` requires the file to be on a local file system to perform zero-copy transfer.
   • C`sendfile` is only supported for files larger than 1 MB.
   • D`sendfile` only works with HTTP/2 connections.
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2. 17foundation · easy

   What is the role of NGINX when configured as a reverse proxy?

   • AIt caches DNS records for faster domain resolution.
   • BIt blocks all requests that do not originate from a trusted IP.
   • CIt accepts client requests and forwards them to backend servers, returning the response to the client.
   • DIt encrypts all traffic between clients and backend servers.
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4. 18application · medium

   A web server is experiencing high CPU usage during peak traffic. The administrator notices that the server is running a traditional process-per-connection model. They are considering switching to NGINX to reduce CPU overhead. Which NGINX feature is most responsible for reducing CPU usage under high concurrency?

   • AUsing a thread pool to handle blocking I/O operations in parallel.
   • BPre-forking a large number of worker processes to handle each connection in parallel.
   • CUsing a single-threaded event loop that processes requests sequentially, avoiding context switches.
   • DAsynchronous, non-blocking I/O that allows a single worker to handle many connections without blocking on I/O operations.
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5. 19expert · hard

   An NGINX server is running with multiple worker processes. One worker process crashes due to a bug in a third-party module. The administrator needs to ensure that the crash does not affect the availability of the service. What is the expected behavior of NGINX's master-worker model in this situation?

   • AThe master process will automatically restart the crashed worker, and other workers will continue to serve requests.
   • BThe entire NGINX service will stop because the master process is also affected by the crash.
   • CNGINX will automatically disable the faulty module and reload the configuration.
   • DThe crashed worker will be restarted, but all existing connections will be dropped.
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6. 20application · medium

   A company wants to use NGINX as a reverse proxy to terminate TLS and forward traffic to a backend application. They also need to handle a high number of concurrent connections. Which NGINX configuration is most appropriate?

   • AConfigure `listen 80;` and use `return 301 https://backend;` to redirect traffic.
   • BConfigure `listen 443 ssl;` with `ssl_certificate` and `proxy_pass` to the backend.
   • CUse `stub_status` to monitor connections and `proxy_pass` to the backend.
   • DSet `ssl_protocols TLSv1.3;` and `proxy_set_header X-Forwarded-Proto $scheme;` only.
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