Erros Checking

Created by: roshan231
Created on: 07-11-19 19:39

What is a parity check?

Its a process computers use to make sure the data sent across a network is sent without discrepancy.

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How does a Even parity check work?

The computer examines the number of ones in the sent bits, if there are an even amount a 0 is added to the left side(MSB) if the amount is odd a one is added instead. The receiving computer checks is the MSB added.

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Example: If the bits to be sent were 10010 what would the other PC theoretically receive?.

010010, i it would then check and see that the number of one's is even therefore the parity check was successful.

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What would happen if the computer detected an anomaly?

There would be a request for re-transmission of these bits.

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What;s the difference between an even and odd parity?

in an even parity a zero is added as the MSB is there are in even amount of ones. Whereas, in an odd parity, a Zero is added as the MSB is there are an Odd Number of ones.

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What is Majority voting ?

In this method of error checking each bit is sent 3 times, therefore is there is a discrepancy in a set of three bits the computer can detect this error

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What would be the output if 11001 was put through majority voting without discrepancy?

111 111 000 000 111

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What are the benefits and disadvantages of majority voting?

It is much more reliable than Parity checking as parity checking can fail if the MSB faces discrepancy. However, this takes up much more bits causing clogging issues on a network, significantly lowering the network speed.

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What is a check Digit?

it is a value that has been added to the end of the number to make sure the value has not been currupted

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How do check Digits work?

A check digit is calculated using the rest of the digits in the sequence therefore, if there is a discrepancy in any of these digits, even once, the final check digit will change alerting the Computer that there has been an error in transition.

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Other cards in this set

Card 2

Front

Back

How does a Even parity check work?

Card 3

Front

010010, i it would then check and see that the number of one's is even therefore the parity check was successful.

Back

Card 4

Front

There would be a request for re-transmission of these bits.

Back

Card 5

Front

in an even parity a zero is added as the MSB is there are in even amount of ones. Whereas, in an odd parity, a Zero is added as the MSB is there are an Odd Number of ones.

Back

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Erros Checking