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ERROR CHECKING METHODS - Coggle Diagram
ERROR CHECKING METHODS
PARITY CHECK:
WORKING:
- The sender and receiver make an agreement for their data parity whether odd or even
- Data is added accordingly along with an extra bit (1 or 0) with each byte
- The sending computer sends this to the recieving computer
- the checking is done with consideration of the agreement done
- If the parity of the data is incorrect, the receiving computer will request to have the data transmitted again
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DISADVANTAGE: If two bits are transposed (change places) then the computer could be fooled into thinking the data is correct and not corrupted or even system fooling
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ECHO CHECK:
WORKING:
With an echo check, the receiving computer sends a copy of the data immediately back to the sending computer for comparison.
The sending computer compares the two sets of data to check if any errors occurred during the transmission process.
If an error has occurred, the data will be transmitted again.
EXAMPLE:
WITH ERROR- Now there are 2 mountains you scream your name on the same mountain and another person screams on another mountain top a little more louder so you will hear their voice as echo and not yours hence there is a clash which means there is an error occurred which is echo check but it is not a reliable method
WITHOUT ERROR- You are standing on a very hilly place at the top peak and scream your name loudly you’ll hear an echo
DISADVANTAGE; If the two sets of data are different you will have no way of knowing whether the error occurred when originally sent, or when it was sent back