Data communication - Question and answer - 10

49. What are the different methods for Digital signal transmission ?
Data transmission (also data communication or digital communications) is the transfer of data (a digital bitstream or a digitized analog signal) over a point-to-point or point-to-multipoint communication channel.

50. What is Simple Parity-Check Code?
The single parity-check code is used in ASCII where characters are represented by seven bits and the eighth bit is a parity bit. Simple parity-check codes can detect all single-bit errors. It can also detect multiple errors only if the total number of errors in a data unit is odd.

51. Explain Cyclic Redundancy Check (CRC) code ?
A cyclic redundancy check (CRC) is an error-detecting code commonly used in digital networks and storage devices to detect accidental changes to raw data. Blocks of data entering these systems get a short check value attached, based on the remainder of a polynomial division of their contents.

52. Write about Simplest Protocol ?
Simplest Protocol is one that has no flow or error control and it is a unidirectional protocol in which data frames are traveling in only one direction-from the sender to receiver. We assume that the receiver can immediately handle any frame it receives with a processing time that is small enough to be negligible.

53. Write about Stop and wait protocol ?
Stop and Wait Protocol is the simplest flow control method. In this, the sender will send one frame at a time to the receiver. This time(i.e. the time between message sending and acknowledgement receiving) is the waiting time for the sender and the sender is totally idle during this time.

54. Write about Stop and wait with ARQ protocol ?
Stop-and-wait ARQ, also referred to as alternating bit protocol, is a method in telecommunications to send information between two connected devices. It ensures that information is not lost due to dropped packets and that packets are received in the correct order.

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