Which of the following is not a form of physical transmission media?
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The guided and the unguided are the major transmission media in communication networks. Below, we explain both media with examples. Show
Guided transmission mediumA guided transmission medium is also known as bounded transmission. This means that signal transmission is done through a narrow path with the use of physical links. Some examples of the guided means of communication are given below: Twisted pairA twisted pair cable is mostly used in the transmission of telephone signals and signals in Ethernet networks. A twisted pair cable is comprised of two distinct insulated copper wires which are twisted together. Coaxial cableCoaxial cable is mostly used in the transfer of radio frequency in transverse electromagnetic waves. It is made up of copper cable and can be used in the transfer of high-frequency signals at low loss. Its an example of a guided means of signal transmission. Optical FiberFiber optics are made of glass or plastic and are comprised of small diameters bundled together to make a fiber-optic cable, they transmit signals as light pulses and can travel over long distances. It applies well for communication signal transmission. Unguided transmission mediumAn unguided transmission is where electromagnetic waves travel in an unguided form. They could travel through air, vacuum or seawater. In unguided transmission there is no involvement of a physical medium for the transmission of the signal. Some examples of unguided transmission are given below: Microwave transmissionMicrowave signals are electromagnetic waves with frequencies ranging from 1Ghz to 300Ghz. Microwave signals are clearly unguided and unidirectional in nature, meaning the sender and receiver end of the signal has to be aligned for signal propagation to be complete. Radio wave transmissionRadio wave signals are electromagnetic waves with frequencies ranging from 3KHZ and 1GHz, they are omnidirectional in nature, meaning the receiver and transmitter end of the signal has no need of alignment for a perfect signal transmission. We apply this transmission in our AM and FM radio stations, where signals can be received at any location within frequency range without the need to align the devices. Infrared transmissionInfrared signal transmission has been in use for such a long time that it is seen in the operation of TV remotes as well as other device connections at a close range. It uses the light spectrum to send a focused light beam to a receiver. In infrared transmission, a focused lens is used by the device transmitting the signal while a collective lens is used by the device receiving the signal. It is a kind of unguided means of transmission with very short distance of operation. ConclusionGuided and and unguided transmission media are both important because they help guide communication signals to their respective ends. In this section of Data Communication and Networking – Transmission Media MCQ (multiple choice) Based Questions and Answers,it cover the below lists of topics.All the Multiple Choice Questions and Answers (MCQs) have been compiled from the book of Data Communication and Networking by The well known author behrouz forouzan. 1 2 . Signals with a frequency below 2 MHz use _______ propagation.
3 . Signals with a frequency between 2 MHz and 30 MHz use ______ propagation
4 . Signals with a frequency above 30 MHz use _______propagation
5 . A parabolic dish antenna is a(n) _______ antenna.
6 . A(n) _____ medium provides a physical conduit from one device to another.
7 . ________ cable consists of two insulated copper wires twisted together.
8 . _______ cable is used for voice and data communications.
9 . _________ consists of a central conductor and a shield.
10 . _____ cable can carry signals of higher frequency ranges than _____ cable.
11 . ______ cables are composed of a glass or plastic inner core surrounded by cladding, all encased in an outside jacket.
12 . ______ cables carry data signals in the form of light.
13 . In a fiber-optic cable, the signal is propagated along the inner core by _______
14 . _________ media transport electromagnetic waves without the use of a physical conductor
15 . Radio waves are _________
16 . Microwaves are _________
17 . _______ are used for cellular phone, satellite, and wireless LAN communications.
18 . ________ are used for short-range communications such as those between a PC and a peripheral device.
19 . Transmission media are usually categorized as _______.
20 . Transmission media lie below the _______ layer.
21 . ______ cable consists of an inner copper core and a second conducting outer sheath.
22 . In fiber optics, the signal is _______ waves.
23 . Which of the following primarily uses guided media?
24 . Which of the following is not a guided medium?
25 . What is the major factor that makes coaxial cable less susceptible to noise than twisted-pair cable?
26 . In an optical fiber, the inner core is _______ the cladding.
27 . The inner core of an optical fiber is _______ in composition.
28 . When a beam of light travels through media of two different densities, if the angle of incidence is greater than the critical angle, _______ occurs.
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Which of the following are the physical transmission media?Physical transmission media used in communications include twisted-pair cable, coaxial cable, and fiber-optic cable.
What are 4 types of transmission media?Transmission Media & Types. Twisted Pair Cable. Twisted pair cables have been around for a long time. ... . Coaxial Cables. The coaxial cables have a central copper conductor, surrounded by an insulating layer, a conducting shield, and the outermost plastic sheath. ... . Optical Fibers. ... . Wireless or Unguided Transmission Media.. Which of the following is not a type of transmission media?A modem is not a transmission medium out of the given options. There are two forms of media of transmission, that is directed and unguided. Cables such as twisted pair cables, coaxial cables, and fiber optic cables are guided transmission devices.
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