An integer overflow occurs when an arithmetic operation attempts to create a numeric value that is larger than can be represented within the available storage space. On some processors the result saturates - once the maximum value is reached attempts to make it larger simply return the maximum result.

An intrusion detection system (IDS) would be the next line of defense after the firewall. It would detect anomalies in the network/server activity and try to detect the perpetrator. Antivirus programs, personal firewalls and VI_AN configurations would be later in the line of defense.

Explanation/Reference:
Explanation:
System logs are automated reports which identify most of the activities performed on the computer.
Programs that analyze the system log have been developed to report on specifically defined items. The auditor can then carry out tests to ensure that the correct file version was used for a production run.
Operator problem reports are used by operators to log computer operation problems. Operator work schedules are maintained to assist in human resources planning. Output distribution reports identify all application reports generated and their distribution.

Explanation
The best way to identify whether the IT help desk is meeting service level agreements (SLAs) is A. Review exception reports. Exception reports are documents that highlight any deviations from the agreed service levels, such as breaches, delays, or failures. They can help the IT help desk to monitor their performance, identify root causes, and implement corrective actions. Reviewing exception reports can also help the IT help desk to communicate with the end users and stakeholders about any service issues and their resolution.
Reference: IT help desk support SLA, Section 4: Reporting and Reviewing Service Levels, Page 3.