error checking Flashcards

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1
Q

Parity check

A

checks a byte of data; a parity bit is added; counts number of 1s;

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2
Q

Parity check can be _____ or ______.

A

odd, even

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3
Q

If parity ______, error is detected.

A

incorrect

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4
Q

When will parity not work?

A

two bits interchanged; multiple errors in same byte

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5
Q

Automatic Repeat Request (ARQ)

A

Uses acknowledgement; check performed on receiving data;

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6
Q

ARQ stands for

A

Automatic Repeat Request

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7
Q

ARQ - send an acknowledgement that data is _______.

A

received

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8
Q

ARQ - if acknowledgement not received in set time, data is ________.

A

resent

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9
Q

Checksum

A

Value calculated form the data; added and transmitted with the data;

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10
Q

Checksum - Value recalculated after __________.

A

transmission

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11
Q

Checksum - Value ______ after transmission to check for ______.

A

compared, error

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12
Q

Check digit

A

A digit calculated from the data; added to the data

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13
Q

Check digit - Data _________ when data is resent

A

recalculated

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14
Q

ARQ- if error detected, request sent to ______ data.

A

resend; resend request repeated until data sent correctly

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