Which type of wireless propagation tends to bounce repeatedly from the surface o
ID: 2082910 • Letter: W
Question
Which type of wireless propagation tends to bounce repeatedly from the surface of to the earth to the ionosphere? A. _______ sky wave b. _____ Ground wave c. ___________ Line of sight d. ________ CAN waves Multipath propagation affects received signal strength is what way? a.__________ Can only decrease received signal strength b. ___________ can both increase and decrease received signal strength c. __________ can only decrease received signal Cannot affect signal strength d. ____________ cannot affect received signal strength but only affects the phase of the noise component of the received signal What is the purpose of "jam signal" as used in Ethernet? When is the jam signal sent? a. _________ immediately before a collision is detected b. __________ Immediately after a collision is detected c. __________ At the end of the exponential backoff delay d. ___________ After the preamble signal is sentExplanation / Answer
44) sky wave tends to bounce repeatly from surface of earth to ionosphere.BEst eg of sky wave is AM signal.
45)multipath doesnt increase or decrease the strenght of receive signal.It only change the phase because in multipath eacth path received different phase shift due to different paths.So it effect Phase of noise component of received signal.
46)THe jam signal indicate to all other devices on ethernet segment that there has been a collision and they should not send data over the wire.
47)Immendiately after collision is detected.
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