Identify the Apache error log from the Linux logs: which option represents an error log entry?

• A. 127.0.0.1 - frank [10/Oct/2000:13:55:36-0700] GET /apache_pb.grf HTTP/1.0 200
• B. [Wed Oct 11 14:32:52 2000] [error] [client 127.0.0.1] client denied by server configuration: /export/home/live/ap/htdocs/test
• C. http://victim.com/scripts/../winnt/system32/cmd.exe?/c+dir+c:WINNT/system32/Logfiles/W3SVC1
• D. 127.0.0.1 --[10/Apr/2007:10:39:11 +0300] ] [error] GET /apache_pb.gif HTTP/1.0 200

Answer: (B)

Distinguish Apache error logs by looking for the severity tag and a descriptive error message. In an error log entry you’ll see a timestamp in brackets, followed by the severity like [error], often with client information, and a message that explains what went wrong.

The line that fits this pattern shows:

• a date and time stamp in brackets,

• the exact tag [error],

• a client address in brackets and a message such as "client denied by server configuration" with the resource path.

This is the standard style of an error log entry because it records what went wrong and where, not just what was requested.

The other lines resemble access logs, which record successful requests with the HTTP status code (for example, 200) and do not use the [error] severity tag. One line includes [error] but the surrounding format and status don’t align with typical error log entries, and another line shows a URL-in-request without the error-specific messaging.