Error Detection - Lesson 1 IGCSE

What is the purpose of error detection in data transmission?

• To increase speed
• To ensure data accuracy
• To reduce file size
• To save power

Which error detection method uses a single extra bit to ensure accuracy?

• Checksum
• Echo check
• Parity bit
• ARQ

How does an even parity check work?

• All bits must be even
• Odd number of bits
• Total 1 bits is an even number
• Total 1 bits is an odd number

What method repeats data back to the sender for confirmation?

• Parity check
• Checksum
• Echo check
• ARQ

Which is a common cause of transmission errors?

• Lack of storage
• Electrical interference
• Low bandwidth
• Insufficient power

What does ARQ stand for in data transmission?

• Automatic Repeat reQuest
• Automatic Report Query
• Additional Repeat Quality
• Active Report Queue

How does a checksum verify data integrity?

• By checking the file length
• By comparing two checksums
• By using a single parity bit
• By echoing the data

What is an ISBN an example of?

• Echo check
• Parity check
• Check digit
• ARQ

What is the result of a parity check if two bits are incorrect?

• Error detected
• Error undetected
• Data discarded
• Data verified

Which method uses a timeout if no acknowledgement is received?

• Parity check
• Checksum
• ARQ
• Echo check