Answer:
Crosstalk, Jitter, Impulse noise.
Explanation:
Crosstalk is a network error that occurs when one pair of cable causes interference on another pair of cables thereby preventing efficient data transmission.
Jitter may also impair the accuracy of the data being transmitted across network because minute variations in amplitude, phase, and frequency always occur. The generation of a perfect carrier signal in an analog circuit is almost impossible. The signal may be affected by continuous and rapid network gains or phase changes.
Impulse noise (also referred to as spikes) is the primary source of errors in data communications. Impulse noise can be caused by positioning a communications cable near a source of intermittent but strong electromagnetic pulses, such as an elevator motor.
Counter measures
Shielding (protecting wires by covering them with an insulating coating) is one of the best ways to prevent impulse noise, cross-talk.
Amplifiers can be used to increase signal strength since the connection would run across 4 floors.
Answer: a profession is a job, or what you do for a living
example : a teacher is an example of proffesion
Selection is the step in algorithm that let's the computer decide which group of steps to perform.
<h3>What is Algorithm?</h3>
This can be defined as set of instructions which are used for solving a problem or accomplishing a task.
Selection happens when there are one or more options are available in which the computer decide which group of steps to perform.
Read more about Algorithm here brainly.com/question/11302120
