An administrator wants to log the client's User-Agent string and the referrer URL in the access log. Which log_format variables should be used?

$http_host and $http_x_forwarded_for

$http_user_agent and $http_referer

A user reports that a download of a large file fails after several minutes. The access log shows a 200 response with a partial body size. The error log shows: [error] 1234#0: *789 upstream prematurely closed connection while reading response header from upstream What is the most likely cause of this issue?

The proxy_max_temp_file_size was exceeded.

The proxy_read_timeout was set too low.

The client's internet connection dropped.

The upstream server closed the connection before sending the complete file.

F5Certified Administrator NGINX - Troubleshooting

Domain 2Objective 1

Interpret Logs F5N4 Practice Questions (Page 4)

Part of the Troubleshoot basic use cases domain, which makes up ~60% of our current practice bank. F5 does not publish an official question count, but from its 30-minute exam (~10–20 total, ~6–12 in this domain), expect 1–2 from this objective — we provide 21 practice questions to prepare you well beyond it. (estimate)

21questions here

5free pages

6concepts

Questions 16–20

16foundation · easy
What is the default log format used by NGINX for access logs?
Select an answer first
17application · medium
An administrator wants to log the client's User-Agent string and the referrer URL in the access log. Which log_format variables should be used?
Select an answer first
18expert · medium
A user reports that a download of a large file fails after several minutes. The access log shows a 200 response with a partial body size. The error log shows: [error] 1234#0: *789 upstream prematurely closed connection while reading response header from upstream What is the most likely cause of this issue?
Select an answer first
19foundation · easy
Which directive is used to define a custom log format in NGINX?
Select an answer first
20foundation · easy
Which error log level would you set to see detailed debugging information about NGINX internals?
Select an answer first

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Interpret Logs F5N4 Practice Questions (Page 4)

Questions 16–20

What is the default log format used by NGINX for access logs?

An administrator wants to log the client's User-Agent string and the referrer URL in the access log. Which log_format variables should be used?

Which directive is used to define a custom log format in NGINX?

Which error log level would you set to see detailed debugging information about NGINX internals?

Keep studying — Troubleshoot basic use cases