Quiz on Error Checking

What is the estimated volume of data that will be created worldwide by 2025?

• 180 zebra bytes

• 200 zebra bytes

• 150 zebra bytes

• 100 zebra bytes

Answer explanation

The estimated volume of data created worldwide by 2025 is projected to reach 180 zettabytes, reflecting the exponential growth of digital information due to advancements in technology and increased internet usage.

What is one of the main reasons for the need for error checking?

• Data is always accurate

• Data is always encrypted

• Data can be lost, gained, or changed

• Data is never transmitted

Answer explanation

Error checking is essential because data can be lost, gained, or changed during transmission or processing. This variability necessitates mechanisms to ensure data integrity and accuracy.

What type of interference can cause data corruption?

• Visual interference

• Chemical interference

• Electrical interference

• Mechanical interference

Answer explanation

Electrical interference can disrupt the signals in data transmission, leading to data corruption. Unlike other types of interference, such as visual or mechanical, electrical interference directly affects electronic signals.

What can happen to bits of data due to electrical interference?

• They can be duplicated

• They can be encrypted

• They can be deleted

• They can become corrupt

Answer explanation

Electrical interference can disrupt the integrity of data, leading to corruption. This means that the original data may be altered or rendered unusable, making 'They can become corrupt' the correct choice.

What is packet switching?

• A form of data encryption

• A type of error checking

• A process that can cause data loss or gain

• A method of data storage

Answer explanation

Packet switching is a method of data transmission where data is broken into packets. This process can lead to data loss if packets are lost or delayed, or gain if packets are duplicated, making it the correct choice.

Which of the following is NOT an error checking method mentioned?

• Parity Checks

• Checksums

• Echo Checks

• Data Compression

Answer explanation

Data Compression is not an error checking method. Parity Checks, Checksums, and Echo Checks are all techniques used to detect errors in data transmission.

What does a parity check do?

• Measures data speed

• Counts the total data volume

• Verifies the number of bits

• Checks for data encryption

Answer explanation

A parity check verifies the number of bits in a data set to ensure that the data has not been corrupted during transmission. It checks whether the number of set bits is even or odd, thus confirming data integrity.

Which method involves repeating a query to ensure data accuracy?

• Automatic repeat query (ARQ)

• Echo Checks

• Check Digits

• Parity Block Checks

Answer explanation

The Automatic Repeat Query (ARQ) method involves resending a query to confirm data accuracy, making it the correct choice. Other options like Echo Checks and Check Digits do not specifically focus on repeating queries.

What can happen to data during transmission?

• It can be stored

• It can be lost or gained

• It can be printed

• It can be displayed

Answer explanation

During transmission, data can be lost due to errors or interruptions, or it can be gained if additional data is added. Thus, the correct answer is that data can be lost or gained.

What is a checksum used for?

• To encrypt data

• To check data integrity

• To store data

• To compress data

Answer explanation

A checksum is primarily used to check data integrity by verifying that data has not been altered or corrupted during transmission or storage. It does not encrypt, store, or compress data.