Explain the process of detecting transmission errors and correcting them.
In the field of Data Communication and Computer Networks, error detection and correction are crucial to ensuring reliable data transmission over potentially noisy communication channels. These processes are essential because transmission errors can occur due to various reasons, such as signal degradation, interference, or noise. Effective mechanisms are employed to detect and correct these errors, ensuring that the data received is as close as possible to the original data sent. This is achieved through error detection techniques, error correction techniques, and sometimes a combination of both.
### Error Detection
Error detection refers to the process of identifying errors that may have occurred during data transmission. The primary goal is to ensure that the data received by the destination is accurate. There are several methods to detect errors:
1. Parity Bit:
The simplest form of error detection is the parity bit. A parity bit is an extra bit added to a data unit, such as a byte, to make the number of 1s either even or odd. There are two types of parity:
- Even Parity: The number of 1s in the data unit, including the parity bit, should be even.
- Odd Parity: The number of 1s should be odd.
When the data is received, the receiver checks the parity. If the parity doesn’t match __________ ____ ______ ____ ___.
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