Which type of wireless propagation tends to bounce respectively from the surface
ID: 2082907 • Letter: W
Question
Which type of wireless propagation tends to bounce respectively from the surface of the Earth to the Ionosphere? a.________ sky wave b. _________ Ground wave c. _______ Line of sight d. ________ CAN waves Multipath propagation received 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 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
The jam signal or jamming signal is a signal that carries a 32-bit binary pattern sent by a data station to inform the other stations of the collision and that they must not transmit.
If a collision is detected , a special jam signal is transmitted, so that all other receivers can know there was a collision.
So answer is immediately after collision is detected
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