Error Detection in Digital Transmission
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Questions and Answers

What is the primary purpose of adding an error-detecting code near the end of each frame?

  • To encrypt data for secure transmission
  • To compress data for faster transmission
  • To correct errors that occur during transmission
  • To detect errors that occur during transmission (correct)
  • What is the result of the modulo operation (590 mod 256)?

  • 2
  • 590
  • 78 (correct)
  • 256
  • What type of error correction is used when the receiver requests retransmission of data?

  • Backward Error Correction (correct)
  • Checksum Code
  • Error Detection Code
  • Forward Error Correction
  • What is the purpose of a checksum?

    <p>To detect errors in data transmission</p> Signup and view all the answers

    What is the result of the Java expression (100+0+155+30+55+250) % 256?

    <p>78</p> Signup and view all the answers

    What is the minimum number of bits that must differ between all valid Hamming codes?

    <p>3</p> Signup and view all the answers

    What is the maximum number of bits that can be corrected by a Hamming code with a minimum distance of 7?

    <p>2</p> Signup and view all the answers

    What is the purpose of calculating the remainder of 590 divided by 256 in the context of error detection?

    <p>To detect errors in the transmission of data</p> Signup and view all the answers

    What is the benefit of using a hash function like MD5 or SHA256 in error detection?

    <p>It detects small changes in the input data with a high probability</p> Signup and view all the answers

    What is the primary purpose of forward error correction?

    <p>To reduce the underlying error rate before backward error correction</p> Signup and view all the answers

    What is the benefit of multiplexing several Hamming codes during transmission in situations with bursty noise?

    <p>Improved robustness against bursty noise</p> Signup and view all the answers

    What is the process called when the receiver recalculates the error-detecting code and compares it with the code stored in the frame?

    <p>Backward Error Correction</p> Signup and view all the answers

    What is the purpose of the error-detecting code in each frame of data transmission?

    <p>To detect errors in the data transmission</p> Signup and view all the answers

    How does the number of extra bits needed for Hamming codes increase with the number of data bits encoded?

    <p>Logarithmically</p> Signup and view all the answers

    What is an example of a technology that uses error detection and correction codes?

    <p>Data Storage on Hard Drives</p> Signup and view all the answers

    What is the purpose of backward error correction?

    <p>To correct errors in transmitted data</p> Signup and view all the answers

    What is the name of the technique used to keep the bottom 8 bits of the result when calculating the remainder of 590 divided by 256?

    <p>Bitwise AND</p> Signup and view all the answers

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