Describe How to Troubleshoot Various Response F5N4 Practice Questions (Page 2)

Questions 6–10

1. 6foundation · easy

   An NGINX error log shows `upstream prematurely closed connection while reading response header from upstream`. What is the most likely cause of this error?

   • AThe DNS resolution for the upstream server failed.
   • BNGINX's configuration file contains a syntax error.
   • CThe client closed the connection before receiving the response.
   • DThe upstream server closed the connection before sending a complete response.
   Reveal Solution Discussion Select an answer first
2. 7foundation · easy

   A user reports that a page takes a long time to load. Which NGINX log directive would an administrator use to log the time taken to receive a response from an upstream server?

   • A$upstream_response_time
   • B$connection_time
   • C$bytes_sent
   • D$request_time
   Reveal Solution Discussion Select an answer first
4. 8application · medium

   Users report that a web application sometimes shows a cached version of a page even after the content has been updated. The application sets the Cache-Control header to 'no-cache' but NGINX is configured with proxy_cache. You inspect the response headers and see 'X-Proxy-Cache: HIT'. What is the most likely reason the cached version is served despite the no-cache header?

   • AThe proxy_cache_valid directive is set to ignore Cache-Control
   • BThe proxy_cache_bypass directive is set to $http_cache_control
   • CThe proxy_cache_key is not including the request URI
   • DThe proxy_ignore_headers directive includes Cache-Control
   Reveal Solution Discussion Select an answer first
5. 9foundation · easy

   A user reports that a web page displays garbled text instead of proper characters. Which response header should an administrator inspect first to diagnose this issue?

   • AContent-Length
   • BServer
   • CContent-Type
   • DDate
   Reveal Solution Discussion Select an answer first
6. 10foundation · easy

   To debug a response issue, an administrator enables debug logging in NGINX. Which directive is used to set the error log level to debug?

   • Alog_format debug ...;
   • Bdebug_log /var/log/nginx/debug.log;
   • Caccess_log /var/log/nginx/access.log debug;
   • Derror_log /var/log/nginx/error.log debug;
   Reveal Solution Discussion Select an answer first