Describe How to Troubleshoot Various Response F5N4 Practice Questions (Page 1)

Questions 1–5

1. 1foundation · easy

   An administrator notices that responses are slow and suspects the backend server is the bottleneck. Which tool or command can be used to measure the time it takes for the backend to respond to a request?

   • Atail -f /var/log/nginx/error.log
   • Bcurl -w '%{time_total}'
   • Cnginx -t
   • Dsystemctl status nginx
   Reveal Solution Discussion Select an answer first
2. 2application · medium

   A reverse proxy returns a 503 Service Unavailable for all requests to a backend. The NGINX error log shows 'no live upstreams while connecting to upstream'. The upstream servers are all marked down in the upstream block. What is the most likely reason the upstreams are marked down?

   • AThe proxy_next_upstream directive is set to off
   • BThe keepalive directive is set to 0 in the upstream block
   • CThe proxy_connect_timeout is set too low
   • DThe health checks are failing because the backend returns 500 for the health check URI
   Reveal Solution Discussion Select an answer first
4. 3application · medium

   A reverse proxy is serving an HTML page, but the browser displays the raw HTML source instead of rendering it. The response headers show 'Content-Type: text/plain'. The upstream application sends 'Content-Type: text/html'. What is the most likely cause?

   • ANGINX is compressing the response and the browser cannot decompress it
   • BThe upstream is sending the body with a BOM that confuses the browser
   • CNGINX is overriding the Content-Type with add_header
   • DThe proxy_pass directive is missing a trailing slash, causing a redirect
   Reveal Solution Discussion Select an answer first
5. 4foundation · easy

   An administrator needs to see detailed information about an NGINX request, including upstream response time and cache status. Which NGINX module provides the `$upstream_cache_status` variable for logging?

   • Angx_http_rewrite_module
   • Bngx_http_upstream_module
   • Cngx_http_ssl_module
   • Dngx_http_gzip_module
   Reveal Solution Discussion Select an answer first
6. 5foundation · easy

   An administrator inspects a response header and sees `Content-Type: text/html; charset=utf-8`. What is the purpose of the `charset` parameter in this header?

   • AIt sets the caching policy for the response.
   • BIt defines the language of the content, such as English or Spanish.
   • CIt specifies the character encoding used in the response body.
   • DIt indicates the compression algorithm used on the response body.
   Reveal Solution Discussion Select an answer first