Data communication interview questions

46. What is NIC ?
Network interface card (NIC) is a hardware component without which a computer cannot be connected over a network. It is a circuit board installed in a computer that provides a dedicated network connection to the computer. It is also called network interface controller, network adapter or LAN adapter.

47. Write about Composite Signals ?
A composite signal can be periodic or non-periodic. A periodic composite signal can be decomposed into a series of simple sine waves with discrete frequencies, frequencies that have integer values (1, 2, 3, and so on). A non-periodic composite signal can be decomposed into a combination of an infinite number of simple sine waves with continuous frequencies, frequencies that have real values.

48. What is Multiplexing ?
Multiplexing (or muxing) is a way of sending multiple signals or streams of information over a communications link at the same time in the form of a single, complex signal; the receiver recovers the separate signals, a process called demultiplexing (or demuxing).

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.

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