F.4 ICT的功課問題

2013-09-19 3:46 am

我想問下F.4 ICT的功課問題

1. State the difference between data verification and data validation.

2. Name two data verification techniques and two data validation techniques.

3.What is the use of even parity check?

4.Is there any difference between even parity check and odd parity check?

5. Suggest one situation that parity check cannot detect the occurrence of errors.

6.Suggest one method for data verification which can be used to spot the mistake mentioned above.

回答 (2)

用戶75127

2013-09-23 4:21 am

✔ 最佳答案

1.Data verification is a control used to check whether the inputted data matches that in the source document.
Data validation is the process of comparing data with a set of rules or values to make sure that the data is reasonable and valid.

2.Data verification:Input data twice and double data entry
Data validation:Range check and type check

3.To check digit in digital data transmission.

4.An even parity bit is set to 1 if the number of ones in the binary data is odd. Otherwise, the even parity bit is set to 0.
An odd parity bit is set to 1 if the number of ones in the binary data is even. Otherwise, the odd parity bit is set to 0.

5.An odd number of bits in the data are changed during transmission.

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JIMMY

2013-09-19 8:07 pm

chinese plz

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