crystal reports upc-a barcode

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The average and burst rate were described previously in the Basic Threat Detection Configuration section Actually, if you have already configured the thresholds with basic threat detection, the scanning threat detection will use these configured thresholds If you configure the rate interval in the command just shown, this applies to the average rate The rate interval can range from 300 to 2,592,000 seconds (30 days) The burst rate interval takes this rate and divides it by 60 If the number is less than 10 seconds, it is rounded up to 10 seconds You can configure up to three of these commands with different rate intervals For each event the appliance is monitoring that it considers a scanning attack, it compares it with the average and burst rate limits If either limit is exceeded, the device is considered a target, and the security appliance generates a log message and optionally shuns the attack, depending on whether you configured the shun parameter in the threat-detection scanning-threat command

The McGraw Hill Companies, 2001

To examine the devices that the appliance determines are performing scanning attacks or are the recipient of a scanning attack, use the show threat-detection scanningthreat command:

15

Factor Commitment Objectives Weighting Point Value (A) Performance to Goal (B) Performance Point Value AxB= Performance Comments Authorization Date:

ciscoasa# show threat-detection scanning-threat [attacker | target]

.

Let us consider a schedule S in which there are two consecutive instructions Ii and Ij , of transactions Ti and Tj , respectively (i = j) If Ii and Ij refer to different data items, then we can swap Ii and Ij without affecting the results of any instruction in the schedule However, if Ii and Ij refer to the same data item Q, then the order of the two steps may matter Since we are dealing with only read and write instructions, there are four cases that we need to consider: 1 Ii = read(Q), Ij = read(Q) The order of Ii and Ij does not matter, since the same value of Q is read by Ti and Tj , regardless of the order 2 Ii = read(Q), Ij = write(Q) If Ii comes before Ij , then Ti does not read the value of Q that is written by Tj in instruction Ij If Ij comes before Ii , then Ti reads the value of Q that is written by Tj Thus, the order of Ii and Ij matters 3 Ii = write(Q), Ij = read(Q) The order of Ii and Ij matters for reasons similar to those of the previous case 4 Ii = write(Q), Ij = write(Q) Since both instructions are write operations, the order of these instructions does not affect either Ti or Tj However, the value obtained by the next read(Q) instruction of S is affected, since the result of only the latter of the two write instructions is preserved in the database If there is no other write(Q) instruction after Ii and Ij in S, then the order of Ii and Ij directly affects the nal value of Q in the database state that results from schedule S Thus, only in the case where both Ii and Ij are read instructions does the relative order of their execution not matter We say that Ii and Ij con ict if they are operations by different transactions on the same data item, and at least one of these instructions is a write operation To illustrate the concept of con icting instructions, we consider schedule 3, in Figure 157 The write(A) instruction of T1 con icts with the read(A) instruction of T2 However, the write(A) instruction of T2 does not con ict with the read(B) instruction of T1 , because the two instructions access different data items Let Ii and Ij be consecutive instructions of a schedule S If Ii and Ij are instructions of different transactions and Ii and Ij do not con ict, then we can swap the order of Ii and Ij to produce a new schedule S We expect S to be equivalent to S , since all instructions appear in the same order in both schedules except for Ii and Ij , whose order does not matter Since the write(A) instruction of T2 in schedule 3 of Figure 157 does not con ict with the read(B) instruction of T1 , we can swap these instructions to generate an equivalent schedule, schedule 5, in Figure 158 Regardless of the initial system state, schedules 3 and 5 both produce the same nal system state We continue to swap noncon icting instructions: Swap the read(B) instruction of T1 with the read(A) instruction of T2 Swap the write(B) instruction of T1 with the write(A) instruction of T2 Swap the write(B) instruction of T1 with the read(A) instruction of T2.

If you don t qualify the command, both attackers and targets are listed Here s an example of viewing the detected attackers performing scans:

The McGraw Hill Companies, 2001

If you ve enabled shunning, you can see the addresses that are shunned with the show threat-detection shun command Here s an example of the use of this command:

T1 read(A) write(A) read(B)

ciscoasa# show threat-detection shun Shunned Host List: 10157 10166