QUESTION 1 Select the true statement(s) regarding the OSI Reference Model. a. OS
ID: 3885739 • Letter: Q
Question
QUESTION 1
Select the true statement(s) regarding the OSI Reference Model.
a. OSI RM consists of four layers
b. ISO developed the OSI Reference Model to assist in the conceptualization of how protocols and interface standards work together to enable digital communications
c. The OSI Reference Model is intended for analog communications only
d. All of the above are true
10 points
QUESTION 2
Which OSI Reference Model Layer is associated with common networks (e.g., Ethernet LANs)?
a. Layer 1 - Physical
b. Layer 2 - Data Link
c. Layer 3 - Network
d. Layer 4 - Transport
10 points
QUESTION 3
Today, service providers only implement "partial-mesh" networks based upon network availability and reliability requirements.
True
False
10 points
QUESTION 4
There is no difference between an acoustic signal and an electrical signal. Acoustic and electrical signals are used extensively in satellite communications.
True
False
10 points
QUESTION 5
5. What is the purpose of a transducer?
a. They are used to transform potential energy into power (watts)
b. Transducers were invented by Michael Faraday, who used these devices to create electric motors
c. They transform one type of energy into another type of energy (e.g., acoustic signals into electrical signals and visa versa)
d. None of the above are correct
10 points
QUESTION 6
Only RF signals are considered part of the electromagnetic spectrum. Optical signals consist of photons which behave as a wave and a particle (wave-particle duality), thus optical signals are not considered part of the E-M spectrum.
True
False
10 points
QUESTION 7
Select the correct statement regarding power density.
a. For an unguided signal, power density decreases as it travels away from the transmitter
b. For an unguided signal, power density increases as it travels away from the transmitter
c. For an unguided signal, power density does not change as it travels away from the transmitter
d. None of the above are correct
10 points
QUESTION 8
RF and Optical signals are both E-M waves. Therefore, you can collect an optical E-M wave using an RF antenna.
True
False
10 points
QUESTION 9
1,000,000 Hz (1E6) is equivalent to:
a. 1000kHz
b. 10MHz
c. 1MHz
d. 1GHz
10 points
QUESTION 10
When on a ___________ __________ , users pay for, and have exclusive use of, the network path or medium 24/7.
a. Dedicated Circuit
b. Switched Circuit
c. Virtual Circuit
d. Packet Switched
10 points
QUESTION 11
A telephone is an example of:
a. Simplex Communications
b. Half Duplex Communications
c. Full Duplex Communications
d Complex Communications
10 points
QUESTION 12
A voice signal that has been converted into an electrical signal is called:
a. Baseband
b. Broadband
c. Passband
d. Message
10 points
QUESTION 13
A carrier wave has an amplitude of 5 volts, a frequency of 10 kHz, and -1.57 radian phase angle. Select the correct carrier wave equation.
a. c(t) = 10 cos(2*5*t -1.57)
b. c(t) = 5 cos(2*10*t + 1.57)
c. c(t) = 5 cos(2*10E3*t - 1.57)
d. None of the above are correct
10 points
QUESTION 14
Viewing a signal in the time domain gives you the profile of the signal over time, while viewing the signal in the frequency domain tells you the frequency bandwidth that the signal occupies. Viewing a signal in both domains is important when determining the overall quality of the signal.
True
False
10 points
QUESTION 15
15. Select the correct equation that represents an AM signal.
a. s(t) = Ac[1 + AM cos (2fmt)] cos (2fct)
b. s(t) = Ac cos [2fct + FM *sin(2fmt)]
c. s(t) = Ac cos [2fct + p cos (2fmt)]
d. c(t) = Ac cos (2fct ± )
10 points
QUESTION 16
16. Select the correct equation that represents an FM signal.
a. s(t) = Ac[1 + AM cos (2fmt)] cos (2fct)
b. s(t) = Ac cos [2fct + FM *sin(2fmt)]
c. s(t) = Ac cos [2fct + p cos (2fmt)]
d. c(t) = Ac cos (2fct ± )
10 points
QUESTION 17
17. Select the correct equation that represents an PM signal.
a. s(t) = Ac[1 + AM cos (2fmt)] cos (2fct)
b. s(t) = Ac cos [2fct + FM *sin(2fmt)]
c. s(t) = Ac cos [2fct + p cos (2fmt)]
d. c(t) = Ac cos (2fct ± )
10 points
QUESTION 18
The period of a sinusoidal waveform is T = 1E-3 = 1 x 10-3 seconds. What is the frequency and wavelength of the waveform?
a. 1 Hz, 3E8 meters
b. 1 kHz, 3E5 meters
c. 1 MHz, 300 meters
d. 1 GHz, 0.3 meters
10 points
QUESTION 19
19. If the AM Index, µ , is between 0 and 1, the distortion of the signal will be minimized.
True
False
10 points
QUESTION 20
A voltage controlled oscillator (Vco) is used to convert message amplitudes into carrier frequency changes.
True
False
10 points
QUESTION 21
21. Select the correct statement(s) regarding QAM.
a. QAM consists of two carriers operating at the same frequency
b. Using QAM, information is captured on the carrier(s) in the form of amplitude and phase shifts
c. QAM with M=8 can represent 3 bits per symbol
d. All of the above are correct
10 points
QUESTION 22
What does the FM Modulation Index, , tell us.
a. How much the phase of the carrier frequency is allowed to change
b. What the phase of the message signal is in relation to the carrier frequency
c. How much the carrier frequency is allowed to deviate from center
d. All of the above
10 points
QUESTION 23
23. Calculate the data rate for a 1200 baud signal where each symbol can take on one of two levels (M=8)
a. 2400 bps
b. 4800 bps
c. 3600 bps
d. 9600 kbps
10 points
QUESTION 24
A symbol can take on one of 64 signaling levels. How many bits can be represented by a single symbol?
a. N=2
b. N=4
c. N=6
d. N=8
10 points
QUESTION 25
Given the following AM signal, determine the carrier wave's amplitude (Ac) and frequency (fc), the message signals frequency (fm), and the modulation index (µ): s(t) = 3[1 + 0.6cos (2100E3Hz*t)] cos (21E9Hz*t)
a. Ac=3, fc=100kHz, fm=1GHz, µ=0.6
b. Ac=3, fc=1GHz, fm=100kHz, µ=0.6
c. Ac=0.5, fc=1GHz, fm=100kHz, µ=6
d. Ac=0.5, fc=1GHz, fm=2kHz, µ=6
10 points
QUESTION 26
Given the following equation for an FM signal, select the correct information below:
sFM(t) =3cos[(2280khz*t)+3sin(24000Hz*t)], kVCO=2000(Hz/v)
a. FM Index, =9, Message Amplitude, Am=3v
b. FM Index, =3, Message Amplitude, Am=6v
c. FM Index, =3, Message Amplitude, Am=3v
d. FM Index, =9, Message Amplitude, Am=6v
10 points
QUESTION 27
Determine your FM bandwidth given the following: FM Index =5, frequency of your message is fm-4000Hz.
a. 4 kHz
b. 12 kHz
c. 24 kHz
d. 48 kHz
10 points
QUESTION 28
Given the following equation for an PM signal, select the correct information below:
sPM(t) =3cos[(2300MHz*t+5cos(24kHz*t)], kP=0.3
a. PM Index, µp=5, Message Amplitude, Am=16.67v
b. PM Index, µp=6, Message Amplitude, Am=16.67v
c. PM Index, µp=3, Message Amplitude, Am=6v
d. PM Index, µp=6, Message Amplitude, Am=5v
10 points
QUESTION 29
With PM, the message amplitude and frequency are directly related to bandwidth.
True
False
10 points
QUESTION 30
When frequency division multiplexing (FDM) is used, guard channels are NOT required in-between frequency channels.
True
False
a. OSI RM consists of four layers
b. ISO developed the OSI Reference Model to assist in the conceptualization of how protocols and interface standards work together to enable digital communications
c. The OSI Reference Model is intended for analog communications only
d. All of the above are true
Explanation / Answer
QUESTION 1:
Ans:b&c
b. ISO developed the OSI Reference Model to assist in the conceptualization of how protocols and interface standards work together to enable digital communications.
c. The OSI Reference Model is intended for analog communications only
Question 2:
Ans: c. Layer 3 - Network
QUESTION 3
Today, service providers only implement "partial-mesh" networks based upon network availability and reliability requirements.
Ans:True.
QUESTION 4
Ans: False
QUESTION 5
5. What is the purpose of a transducer?
Ans: c. They transform one type of energy into another type of energy (e.g., acoustic signals into electrical signals and visa versa)
QUESTION 6
Only RF signals are considered part of the electromagnetic spectrum. Optical signals consist of photons which behave as a wave and a particle (wave-particle duality), thus optical signals are not considered part of the E-M spectrum.
Ans: False
QUESTION 7
Select the correct statement regarding power density.
Ans:a. For an unguided signal, power density decreases as it travels away from the transmitter
QUESTION 8
RF and Optical signals are both E-M waves. Therefore, you can collect an optical E-M wave using an RF antenna.
Ans: False
QUESTION 9
1,000,000 Hz (1E6) is equivalent to:
Ans: c. 1MHz
1,000,000 Hz = 1MHz
1,000,000 Hz = 0.001GHz
QUESTION 10
When on a ___________ __________ , users pay for, and have exclusive use of, the network path or medium 24/7.
Ans: a. Dedicated Circuit
QUESTION 11
A telephone is an example of:
Ans:c. Full Duplex Communications
QUESTION 12
A voice signal that has been converted into an electrical signal is called:
Ans:b. Broadband
QUESTION 14
Viewing a signal in the time domain gives you the profile of the signal over time, while viewing the signal in the frequency domain tells you the frequency bandwidth that the signal occupies. Viewing a signal in both domains is important when determining the overall quality of the signal.
Ans: True
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