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What is the error detection technique that can detect errors with only one bit?
(a) simple parity check (b) two-dimensional parity check (c) crc (d) checksum
What is the verb for detection?
The verb for detection is detect.Other verbs are detects, detecting and detected.Some examples are:"I detect a foul smell in the air"."He detects something"."My metal detector is detecting something"."As usual, the detector only detected junk".
What do you mean by single bit error correction?
A special system of multiple parity bits (e.g. Hamming parity) that allows not only error detection but limited error correction.Ordinary single bit parity can detect reliably single bit errors.Hamming parity can correct single bit errors and detect reliably double bit errors.
What is the major drawback of single bit parity check method for error detection?
The major drawback of the single bit parity check method for error detection is its inability to detect errors when an even number of bits are flipped. For example, if two bits in a data unit change, the parity may still appear correct, leading to undetected errors. Additionally, it can only indicate whether an error has occurred, not the location or nature of the error, limiting its effectiveness in error correction.
What is error control in networking?
An error-detection code by itself does not control errors, but it can be used to request repeated transmission of errored code words until they are received error-free. This technique is called ARQ. In terms of error performance, ARQ outperforms forward error correction (FEC) because code words always are delivered error-free (provided the error-detection code doesn't fail). However, this performance does not come free of charge - we pay for it with decreased throughput. The chief advantage of ARQ is that error detection requires simpler decoding than error correction. ARQ also is adaptive because it only re-transmits information when errors occur. On the other hand, ARQ schemes require a feedback path that may not be available.
What is the weakness of a parity?
The weakness of a parity bit is that it can only detect single-bit errors, meaning if two bits are flipped, the parity will remain unchanged, leading to undetected errors. Additionally, it provides no information about which bit is erroneous, making it less effective for error correction. This limitation makes parity insufficient for systems requiring higher reliability and error detection capabilities.
How can the parity bit detect a damaged data unit?
A parity bit is an error detection mechanism that adds a single binary digit to a data unit to ensure that the total number of 1s in the unit is either even (even parity) or odd (odd parity). When the data unit is transmitted, the receiver recalculates the parity based on the received data. If the calculated parity does not match the expected parity, it indicates that the data unit has been altered or damaged during transmission, allowing for error detection. However, it can only detect an odd number of bit errors; if an even number of bits are flipped, the parity might still appear correct.
Suppose that noise changes the data unit 01110000 to 01110011 what will detect the error?
Longitudinal redundancy checking LRC only
How are any bit errors handled?
Bit errors are typically handled through error detection and correction techniques. Error detection methods, such as checksums or cyclic redundancy checks (CRC), identify errors in transmitted data, while error correction methods, like Hamming code or Reed-Solomon coding, allow the system to not only detect but also correct the errors without needing retransmission. In networking, protocols like Automatic Repeat reQuest (ARQ) can request retransmission of corrupted data. Together, these methods ensure data integrity and reliability in communication systems.
Why does the the florescense appear in the chaneels only n not in the form of moving bands While performing Gel electrophoresis For DNA detection?
Only the bands should show fluorescence, you must be doing the technique wrong..
Why even parity and odd parity mechanisms are ineffective in modern communications?
Even and odd parity mechanisms are ineffective in modern communications primarily due to their limited error-detection capabilities, as they can only detect single-bit errors and fail to identify multiple-bit errors or errors in an even number of bits. In today's data transmission environments, where the likelihood of complex error patterns is higher, more robust error detection and correction methods, such as checksums, cyclic redundancy checks (CRC), or forward error correction (FEC), are necessary to ensure data integrity. Additionally, the simplicity of parity checks makes them inadequate for the high-speed, high-volume demands of modern networks.
How does a parity bit in ASCII code help in error detection?
A parity bit in ASCII code provides a simple method for error detection by adding an extra bit to a binary representation of a character, ensuring that the total number of 1s in the byte is either even (even parity) or odd (odd parity). When data is transmitted, the receiving system checks the parity of the received bits against the expected parity. If there is a mismatch, it indicates that an error has occurred during transmission, allowing for the identification of potential data corruption. However, parity bits can only detect single-bit errors and cannot identify which bit is incorrect or handle more complex errors.
