Methods of Error Detection

Why were error detection methods developed?

• ensure that transmission errors are detected as soon as possible

• ensure that transmission errors are not detected as soon as possible

True or False: Without error detection methods, fatalities and system failure are possible consequences

• True

• False

All of these might occur when transmitting data except for

• issues

• errors

• data loss

• data overflow

What is a parity check?

• • An error checking method

• A measurement

• A unit

• A text

What is an even parity?

• Whether the total number of 1s in a byte is even and sets the parity bit to 1

• Even parity only works with odd numbers of data bits

• Even parity is a method of error correction rather than error detection

• Even parity is a programming language

What is checksum?

• The system sends data in blocks with a checksum, which is regenerated by the receiving computer if a mismatch occurs, ensuring correct data is received

• • A checksum is a type of password used for authentication

• • A checksum is a single bit added to data to check for errors

• • A checksum is a cryptographic key used to encrypt data.

First rule to calculate checksum?

• • divide the sum by 256 to get the quotient

• • multiply all the data bits by a random number

• • randomly shuffle the data

• • write the data in reverse order

True or false: Both receiver and sending computer does the error checking, to ensure that no error lies within the data

• True

• False

Which of the following include example of check digits

• Bar codes

• Product codes

• QR Codes

• Links from website

True or false: A specific algorithm is used to calculate a check digit, not any other algorithm as it could mess up the process

• True

• False