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do cisco certifications expire.%b: Number of bytes sent for the HTTP request.%i: Item sent in the HTML header.As with UNIX system logs, the size of Apache logs has the potential to grow rapidly, making it necessary to employ log rotation. This can be done in a variety of ways, including automatically deleting log files that are too large and archiving old data for later review. In emergency situations, log files can be deleted manually. However, a softrestart of Apache is required before a new log file can be enabled to log new HTTP connections. Programs such as Logrotate can also be used to automate the process. Logrotate can force the enablement of parameters set by the administrator, for example, specific dates, size of logs, etc.Important concepts related to Apache access logging are shown below. Key Points Apache sends or logs diagnostic information and any errors it encounters into a log file set by the ErrorLog command.The Apache server logs all inbound requests and all requests to the access log file.The merged log format contains the access, agent, and referrer fields.9.9 Review of Examination PointsThis section reviews the important points in this chapter. The points marked with the "Exam Points" icon in the margin are the key points of this chapter and should be read carefully. Table 9.5 shows the examination points of this chapter.Table 9-5 Exam Points(1 1