Chat with AIExam 6: Wireless Network Fundamentals
Describe two of the four methods of digital signal modulation.
(34) 
VerifiedAmplitude shift keying (ASK) is a binary modulation technique in which the height of the carrier can be changed to represent a 1 or 0 bit. In ASK, a 1 bit has a carrier signal, and a 0 bit has no signal (in other words, voltage versus no voltage).
Frequency shift keying (FSK) is a binary modulation technique in which the carrier signal’s frequency is changed to represent a 1 or 0 bit.
Phase shift keying (PSK) is a binary modulation technique similar to phase modulation, in which the signal’s relative starting point is changed to represent a 1 or 0 bit and changes whenever the bit changes from one to the other. Because PSK is a binary method, the signal starts and stops.
Frequency division multiplexing (FDM) is an RF signaling method in which multiple base signals are modulated on different carrier waves and combined to form a composite signal.
Describe multipath interference.
(40) VerifiedIn multipath,a signal has more than one path from the transmitter to the receiver.If the signal is reflected or refracted by the atmosphere,ground,or other obstacles,the reflected path can interfere with the direct path.This problem is called fading.
Which binary signaling technique uses a scheme in which zero voltage represents a 0 bit and the voltage for a 1 bit does not drop back to zero before the end of the bit period?
(45) VerifiedB
Which of the following is defined as the maximum departure of a wave from the undisturbed state?
(32) Which digital signal modulation method is a binary modulation technique in which the carrier signal's frequency is changed to represent a 1 or 0 bit?
(35) What is a potential problem with having too many APs in a given area?
(30) RF transmits a _______________ signal which can change based on the signal's voltage and direction.
(30) RF signals can pass through walls and other objects while IR cannot.
(29) Which of the following is defined as the positive difference in amplitude between two signals?
(35) The _____________________ wireless standard will use the 5 GHz band and will provide multistation WLANs with up to 1 Gbps bandwidth.
(31) Which type of analog modulation changes the number of waves representing one cycle?
(32) MATCHING
-a form of interference/power loss in which the signal is reflected or refracted by the atmosphere,ground,or other obstacles,and the reflected path interferes with the direct path
(41) MATCHING
-a type of loss in which certain materials absorb the RF signal
(42) In wireless networks,infrared signals are used most often for data communications.
(34) The Fresnel zone is the dispersal pattern of waves as they travel from sending to receiving antennas.
(33) A wireless _______________ combines management and security into a single appliance and can perform authentication,encryption,intrusion detection,and other functions.
(32) 
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