Software Engineering (10th Edition)
10th Edition
ISBN: 9780133943030
Author: Ian Sommerville
Publisher: PEARSON
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Chapter 14, Problem 14.8E
Explanation of Solution
Recognition resistance and strategies:
If the user is trying to move the prices from one trading system to another by making unauthorized access, the recognition, resistance and recovery strategies come into force so as to prevent it.
- With the use of recognition strategy, the operators of the system identify the unauthorized prices movement, which leads to system failure. The system then sends text messages to all the users that an unauthorized person is making the changes in prices.
- With the use of resistance strategy, the critical parts of the system are focused as it identifies the possibility of any cyber-attack on any trading system. As financial trading plays a vital role, it is focused in it.
- With the use of this strategy, the critical services of the system can be restored when the failure of system is occurred. With this the important trading information can be restored easily...
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Students have asked these similar questions
Activity No.
Activity
Time (weeks)
Immediate Predecessors
1
Requirements collection
3
2
Requirements structuring
4
1
3
Process analysis
3
2
4
Data analysis
3
2
5
Logical design
50
3,4
6
Physical design
5
5
7
Implementation
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c. Using the information from part b, prepare a network diagram. Identify the critical path.
Given the following Extended-BNF grammar of the basic mathematical expressions:
Show the derivation steps for the expression: ( 2 + 3 ) * 6 – 20 / ( 3 + 1 )
Draw the parsing tree of this expression.
SEE IMAGE
Whentheuserenters!!,themostrecentcommandinthehistoryisexecuted.In the example above, if the user entered the command:
Osh> !!
The ‘ls -l’ command should be executed and echoed on user’s screen. The command should also be placed in the history buffer as the next command.
Whentheuserentersasingle!followedbyanintegerN,theNthcommandin the history is executed. In the example above, if the user entered the command:
Osh> ! 3
The ‘ps’ command should be executed and echoed on the user’s screen. The command should also be placed in the history buffer as the next command.
Error handling:
The program should also manage basic error handling. For example, if there are no commands in the history, entering !! should result in a message “No commands in history.” Also, if there is no command corresponding to the number entered with the single !, the program should output "No such command in history."
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