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What is a cyclical redundancy check?

Q: What is a cyclical redundancy check?


Q: A cyclical redundancy check: what is it?

  • A way for two computers to synchronize their clocks.
  • A technique that allows for multiple logical LANs to operate on the same equipment.
  • A mathematical calculation used to ensure that all data arrived intact.
  • The actual data being transported by an Ethernet frame.

Explanation: A Cyclical Redundancy Check, often known as a CRC, is a kind of error-detecting code that is frequently used in the error-detection processes of network communication and storage. It is a sort of hash function that requires a data block as an input and returns a string of bits with a specified length; this string is known as the CRC value.

When it comes to networking, CRC is often used as a tool for checking the data’s integrity after it has been transferred. The CRC value for the data is computed by the sender, who then adds it at the end of the message that is sent. When the message is received, the CRC value is recalculated by the receiver, and this new value is compared to the CRC value that was sent. If the numbers are the same, this indicates that the data is most likely accurate; if they are not, there may be some mistakes.

The CRC is a straightforward and effective method for error detection; but, unlike more complicated codes, it does not allow error repair. The Data Link layer of the OSI model is one of the most popular places for its use, notably in protocols like Ethernet.

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