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Five columns are in the display, where the statics are showed in events per second (eps) Each event type is shown in two intervals in the first column: the last 10 minutes and the last hour The first statistical column is the Average rate in events per second (eps) over the specified period This is followed by the Current burst rate in events per second over the burst interval (1/60th of the average rate interval) The Trigger column specifies the number of times that the rate was exceeded in the time interval The last column specifies the total number of events in the period

The McGraw Hill Companies, 2001

For the burst rate displayed, the appliance stores the tallied count at the end of each burst interval, for up to a total of 60 burst intervals; therefore, if you execute the command in the middle of the current burst interval, you won t see the statistics for the current interval; you ll only see the statistics for the previously completed interval The exception to this rule is if the number of events in the current burst interval actually exceeds the number of events in the just previously tallied burst interval In this case the appliance displays the current events in the yet uncompleted burst interval This calculation process allows you to detect a large burst in events in a real-time fashion To clear the basic threat statistics, use the Privilege mode clear threat-detection rate command

15

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T1 read(A) A := A 50 write(A)

Require two levels of supervisor review before final KSO objectives are established and payouts are made Require two levels of supervisor review for any modifications during the program period

read(A) temp := A * 01 A := A temp write(A) read(B) B := B + 50 write(B) read(B) B := B + temp write(B) Figure 155 Schedule 3 a concurrent schedule equivalent to schedule 1

Scanning threat detection was added in version 80 of the appliances This feature allows the appliance to detect scanning attacks, where an attacker is scanning IP addresses of devices or scanning ports on a device or multiple devices in a subnet Your typical IPS or IDS can easily detect fast scan attacks by comparing traffic with its signature database Scanning signatures are basically templates that define the kinds of traffic and the thresholds that have to be reached to indicate a scanning attack More intelligent IPS/ IDS solutions will use heuristic analysis to better determine if a scanning attack is taking place, even those that are spread out over a period The scanning threat detection feature of the appliances falls into the latter camp in its approach to detecting scanning attacks The appliance maintains a database in memory of host statistics and the connections and devices sources are accessing to determine if a scan attack is taking place Basically the appliance is looking for connection anomalies that would indicate scanning, like traffic from a source, without responding traffic from a destination(s), or a source accessing a port that is closed on a destination, using the same IPID numbers in fragments that are part of the same packet (the IPID is the fragment identifier number), and many other anomalies When a scan is detected, the appliance automatically generates a log message about the scan with a log message ID of 730101; optionally you can have the appliance block traffic from the offender, which Cisco calls shunning TIP Enabling scanning threat detection on the appliance will affect its CPU and memory usage, since the appliance must build a database of devices and their connection characteristics, and then compare connections with the database So if you enable the feature, you should carefully monitor it to ensure that the scanning threat detection feature doesn t overwhelm the appliance and cause the appliance to inadvertently drop legitimate packets.