33 Lecture - Error Control

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33 Lecture

CS501

Midterm & Final Term Short Notes

Error Control

Error control refers to the techniques and methods used to detect and correct errors that occur during the transmission or storage of digital data. These errors can result from noise or interference on the communication channel, or from faults i


Important Mcq's
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  1. Which of the following is a technique used for error detection? A) Hamming codes B) Huffman codes C) Lempel-Ziv coding D) None of the above Answer: A) Hamming codes Which of the following is a technique used for error correction? A) Checksums B) CRC C) Reed-Solomon codes D) Both A and B Answer: C) Reed-Solomon codes Which of the following is not a type of error control technique? A) Data encryption B) Error detection codes C) Error correction codes D) None of the above Answer: A) Data encryption Which of the following is a commonly used error detection code? A) CRC B) RSA C) AES D) SHA Answer: A) CRC Which of the following is a commonly used error correction code? A) Parity bits B) Vigenere cipher C) RSA D) None of the above Answer: A) Parity bits Which error control technique is based on adding extra bits to a message to detect errors? A) Checksums B) Hamming codes C) Reed-Solomon codes D) None of the above Answer: A) Checksums Which error control technique is based on adding redundant bits to a message to correct errors? A) Parity bits B) CRC C) Hamming codes D) None of the above Answer: C) Hamming codes Which error control technique is commonly used in wireless communication systems? A) Reed-Solomon codes B) Parity bits C) Checksums D) None of the above Answer: A) Reed-Solomon codes Which of the following is a disadvantage of error control techniques? A) Increased complexity B) Reduced data throughput C) Increased delay D) All of the above Answer: D) All of the above Which error control technique is most commonly used for error detection in computer networking? A) Parity bits B) CRC C) Hamming codes D) Reed-Solomon codes Answer: B) CRC


Subjective Short Notes
Midterm & Finalterm Prepration
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  1. What is the purpose of error control? Answer: The purpose of error control is to detect and correct errors that occur during the transmission or storage of digital data. What are the two main categories of error control techniques? Answer: The two main categories of error control techniques are error detection codes and error correction codes. How does a checksum work for error detection? Answer: A checksum works by adding up all the bytes in a message and sending the sum along with the message. The receiver calculates the sum of the received bytes and compares it to the checksum. If the sums match, the message is assumed to be error-free. What is the difference between parity bits and checksums? Answer: Parity bits add a single bit to a message to detect errors, while checksums add up all the bytes in a message to detect errors. What is the advantage of error correction codes over error detection codes? Answer: Error correction codes can not only detect errors but also correct them, while error detection codes can only detect errors. What is the most commonly used error correction code? Answer: Reed-Solomon codes are the most commonly used error correction code. What is the most commonly used error detection code in computer networking? Answer: CRC is the most commonly used error detection code in computer networking. What is the disadvantage of using error control techniques? Answer: The disadvantage of using error control techniques is that they increase the complexity of data transmission and may result in reduced data throughput and increased delay. Why are error control techniques important in wireless communication systems? Answer: Error control techniques are important in wireless communication systems because wireless communication channels are prone to interference and noise, which can result in errors. What is the main difference between error detection and error correction codes? Answer: The main difference between error detection and error correction codes is that error correction codes can correct errors, while error detection codes can only detect errors.

Error control is a crucial aspect of digital communication systems, as errors can occur during the transmission or storage of data. Error control techniques aim to detect and correct these errors to ensure the integrity and accuracy of the transmitted data. There are two main categories of error control techniques: error detection and error correction codes. Error detection codes, such as checksums and cyclic redundancy check (CRC), add redundancy to the transmitted data to enable the receiver to detect errors. These codes add extra bits to the data stream that are used to check for errors during transmission. If an error is detected, the receiver can request retransmission of the data. On the other hand, error correction codes, such as Reed-Solomon codes and Hamming codes, add redundancy to the transmitted data to enable the receiver to both detect and correct errors. These codes add extra bits to the data stream that are used to correct errors during transmission. If an error is detected, the receiver can use the redundant information to correct the error without requesting retransmission of the data. While error control techniques are essential to ensure the accuracy of digital communication systems, they do have some disadvantages. The added redundancy increases the complexity of data transmission, which can result in reduced data throughput and increased delay. Additionally, error control techniques can be computationally expensive, particularly in the case of error correction codes. Overall, error control techniques play a critical role in ensuring the accuracy and reliability of digital communication systems. The choice of error control technique depends on the specific application and the desired level of reliability. Error detection codes are commonly used in applications where error rates are low and retransmission is acceptable, while error correction codes are used in applications where error rates are high and retransmission is not feasible.

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