PHYSICAL LAYER AND TRANSMISSION MEDIA
INTRODUCTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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True
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False
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Either A or B
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None of the above
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Detailed explanation-1: -Digital transmission occurs when the signal sent over the transmission media constantly varies among an infinite number of states. Digital transmission produces more errors than analog transmission. Ethernet, a common LAN technology, uses Manchester encoding.
Detailed explanation-2: -Microwave transmissions require a line of sight between any two points. Propagation delay is negligible with satellite transmission. One form of interference with satellite transmission is called raindrop attenuation in which the transmissions are absorbed by heavy rain. Fiber optic cable can only be used on LANs.
Detailed explanation-3: -Although single-mode optical fiber holds advantages in terms of bandwidth and reach for longer distances, multimode optical fiber easily supports most distances required for enterprise and data center networks, at a cost significantly less than single-mode.