Introduction of errors and types in computer network

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Error Detection in Computer Networks


Error
A condition when the receiver’s information does not matches with the sender’s information. During transmission, digital signals suffer from noise that can introduce errors in the binary bits travelling from sender to receiver. That means a 0 bit may change to 1 or a 1 bit may change to 0.


Error Detecting Codes (Implemented either at Data link layer or Transport Layer of OSI Model)
Whenever a message is transmitted, it may get scrambled by noise or data may get corrupted. To avoid this, we use error-detecting codes which are additional data added to a given digital message to help us detect if any error has occurred during transmission of the message.


Basic approach used for error detection is the use of redundancy bits, where additional bits are added to facilitate detection of errors.
Some popular techniques for error detection are:
1. Simple Parity check
2. Two-dimensional Parity check
3. Checksum
4. Cyclic redundancy check

Types of Errors

There may be three types of errors:
  • Single bit error
    Single bit error
    In a frame, there is only one bit, anywhere though, which is corrupt.
  • Multiple bits error
    Multiple bits error
    Frame is received with more than one bits in corrupted state.
  • Burst error
    Burst error
    Frame contains more than1 consecutive bits corrupted.
Error control mechanism may involve two possible ways:
  • Error detection
  • Error correction

Thank you viewers

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