new ccna 200-301 course

new ccna 200-301 course.Reflective surfaceFigure 3~4 Reflection Problem4. understanding multipathMultipath is when part of the signal is reflected and will arrive at the receiver out of order, Risk 3.5 Ugly; Figure 3.5 Multipath Problem Reflected SurfaceOne characteristic of multipath is that the receiver may receive the same signal multiple times, which depends on the wavelength and the location of the receiver. Another feature of multipath is that it causes signals to be out of phase (out of phased When you receive different signals, these signals may cancel each other out, producing a zero signal.Streaming volume5. Understanding ScatteringScattering of wireless signals occurs when signals are transmitted in many different directions. This can be caused by objects that have surfaces that reflect and have irregular edges (such as dust particles in air and water). Suppose a beam of light is shone at a pile of broken glass, the beam will reflect in many different directions. The same is true of radio waves, except that tiny particles of dust or water replace the pile of broken glass.Consider the case of massive reflection; if it is raining, a large number of raindrops have the ability to reflect. When radio waves pass through these small particles, they are reflected in many different directions, which is called scattering.e To show this, Figure 3-6 illustrates it with an example of a waveform transmitted between two locations on a college campus. When it is pouring rain, scattering occurs as the signal travels from one antenna to the other.Figure 3.6 Scattering of wireless signals