From the given sample log entries, which line is an Apache error log entry?

From the given sample log entries, which line is an Apache 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/..%c0%af./..%c0%af./..%c0%af./..%c0%af./..%c0%af./..%c0%af./..%c0%af./../winnt/system32/cmd.exe?/c+dir+c:\wintt\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)

Apache error log lines include a timestamp in brackets, followed by a severity tag in brackets (such as [error]), then optional details like [client <IP>], and a descriptive error message. The line that matches this pattern is the one that shows a timestamp, the [error] level, the [client 127.0.0.1] descriptor, and a message about why the request was denied. This combination confirms it as an error entry from Apache. The other lines either resemble access logs or are malformed: - Access log formats show the client IP, user, timestamp, request line, and status code, but do not include an [error] severity tag. - One entry appears as a crafted request string rather than an error message, and another mimics an error line but isn’t properly formed for Apache’s standard error log structure. So the presence of the [error] tag with the client detail and the denial message identifies the Apache error log entry.

Apache error log lines include a timestamp in brackets, followed by a severity tag in brackets (such as [error]), then optional details like [client ], and a descriptive error message. The line that matches this pattern is the one that shows a timestamp, the [error] level, the [client 127.0.0.1] descriptor, and a message about why the request was denied. This combination confirms it as an error entry from Apache.

The other lines either resemble access logs or are malformed:

• Access log formats show the client IP, user, timestamp, request line, and status code, but do not include an [error] severity tag.

• One entry appears as a crafted request string rather than an error message, and another mimics an error line but isn’t properly formed for Apache’s standard error log structure.

So the presence of the [error] tag with the client detail and the denial message identifies the Apache error log entry.