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Transcript
```Chapter 4
Cisco 1 - Networking Basics
Which of the following best describes a digital signal?
Perrine. J
1.
A sine wave of normal shape and amplitude
2.
An electrical technique that is used to convey binary signals
3.
A language of computers with only two states –on and off-that are
indicated by a series of voltage pulses
4.
A transmission that a transceiver sends back to a controller to let it
know the collision circuitry is functional.
5/24/2017
Page 1
Chapter 4
Cisco 1 - Networking Basics
Which of the following best describes a digital signal?
Perrine. J
1.
A sine wave of normal shape and amplitude
2.
An electrical technique that is used to convey binary signals
3.
A language of computers with only two states –on and off-that
are indicated by a series of voltage pulses
4.
A transmission that a transceiver sends back to a controller to let it
know the collision circuitry is functional.
5/24/2017
Page 2
Chapter 4
Cisco 1 - Networking Basics
Which of the following units of measure are commonly used in formulas for
calculating the amount of gain or loss in networking signals? (Choose three.)
Perrine. J
1.
watts
2.
ohms
3.
volts
4.
decibels
5.
joules
6.
amperes
5/24/2017
Page 3
Chapter 4
Cisco 1 - Networking Basics
Which of the following units of measure are commonly used in formulas for
calculating the amount of gain or loss in networking signals? (Choose three.)
Perrine. J
1.
watts
2.
ohms
3.
volts
4.
decibels
5.
joules
6.
amperes
5/24/2017
Page 4
Chapter 4
Cisco 1 - Networking Basics
Which of the following are true about square waves? (Choose three.)
Perrine. J
1.
They repeat the same pattern at regular intervals.
2.
They continuously vary with time.
3.
They repeat the flat pattern on both the top and bottom of the wave.
4.
They do not continuously vary with time.
5.
They occur naturally and change regularly over time.
6.
They change intervals based upon voltage.
5/24/2017
Page 5
Chapter 4
Cisco 1 - Networking Basics
Which of the following are true about square waves? (Choose three.)
Perrine. J
1.
They repeat the same pattern at regular intervals.
2.
They continuously vary with time.
3.
They repeat the flat pattern on both the top and bottom of the
wave.
4.
They do not continuously vary with time.
5.
They occur naturally and change regularly over time.
6.
They change intervals based upon voltage.
5/24/2017
Page 6
Chapter 4
Cisco 1 - Networking Basics
What is a cost-effective way to limit cable signal degradation?
Perrine. J
1.
Specify the maximum cable length between nodes.
2.
Increase the size of the conductors in the cabling.
3.
Improve the type of insulation material
4.
Use a braid or foil covering on wires as a shield
5/24/2017
Page 7
Chapter 4
Cisco 1 - Networking Basics
What is a cost-effective way to limit cable signal degradation?
Perrine. J
1.
Specify the maximum cable length between nodes.
2.
Increase the size of the conductors in the cabling.
3.
Improve the type of insulation material
4.
Use a braid or foil covering on wires as a shield
5/24/2017
Page 8
Chapter 4
Cisco 1 - Networking Basics
What is the purpose of shielding in copper based media? (Choose three.)
Perrine. J
1.
protect one pair of wires within the cable from noise generated by
electrical signals on another pair of wires
2.
ground the cable and prevent electrical shocks
3.
protect the data signal from external sources of noise
4.
eliminate signal loss by keeping the transmitted signal confined to the
cable
5.
decrease attenuation and increase the length possible for the cable
run
6.
ground the cable so that the zero volt reference point is accurate
5/24/2017
Page 9
Chapter 4
Cisco 1 - Networking Basics
What is the purpose of shielding in copper based media? (Choose three.)
Perrine. J
1.
protect one pair of wires within the cable from noise generated
by electrical signals on another pair of wires
2.
ground the cable and prevent electrical shocks
3.
protect the data signal from external sources of noise
4.
eliminate signal loss by keeping the transmitted signal confined
to the cable
5.
decrease attenuation and increase the length possible for the cable
run
6.
ground the cable so that the zero volt reference point is accurate
5/24/2017
Page 10
Chapter 4
Cisco 1 - Networking Basics
For which type of waves would the signal gain or loss be calculated using
the power formula? (Choose two.)
Perrine. J
1.
electromagnetic waves on copper cables
2.
electrical waves on copper cables
3.
light waves on optical fiber
4.
radio waves in the air
5.
sound waves in the air
5/24/2017
Page 11
Chapter 4
Cisco 1 - Networking Basics
For which type of waves would the signal gain or loss be calculated using
the power formula? (Choose two.)
Perrine. J
1.
electromagnetic waves on copper cables
2.
electrical waves on copper cables
3.
light waves on optical fiber
4.
radio waves in the air
5.
sound waves in the air
5/24/2017
Page 12
Chapter 4
Cisco 1 - Networking Basics
Identify common ways in which the capacities of communication systems are
measured? (Choose two.)
Perrine. J
1.
analog bandwidth
2.
resistance capacity
3.
carrier bandwidth
4.
polarity capacity
5.
digital bandwidth
5/24/2017
Page 13
Chapter 4
Cisco 1 - Networking Basics
Identify common ways in which the capacities of communication systems are
measured? (Choose two.)
Perrine. J
1.
analog bandwidth
2.
resistance capacity
3.
carrier bandwidth
4.
polarity capacity
5.
digital bandwidth
5/24/2017
Page 14
Chapter 4
Cisco 1 - Networking Basics
How is the signal reference ground established?
Perrine. J
1.
By connecting the ground wire to the network wire
2.
By connecting the network wire to the jumper connector
3.
By connecting the ground plane to the computer’s cabinet
4.
By connecting the computer chassis to the network cable
5/24/2017
Page 15
Chapter 4
Cisco 1 - Networking Basics
How is the signal reference ground established?
Perrine. J
1.
By connecting the ground wire to the network wire
2.
By connecting the network wire to the jumper connector
3.
By connecting the ground plane to the computer’s cabinet
4.
By connecting the computer chassis to the network cable
5/24/2017
Page 16
Chapter 4
Cisco 1 - Networking Basics
Which of the following are possible sources of line noise? (Choose three.)
Perrine. J
1.
2.
electrical motors
3.
crosstalk
4.
laser light
5.
incandescent light
5/24/2017
Page 17
Chapter 4
Cisco 1 - Networking Basics
Which of the following are possible sources of line noise? (Choose three.)
Perrine. J
1.
2.
electrical motors
3.
crosstalk
4.
laser light
5.
incandescent light
5/24/2017
Page 18
Chapter 4
Cisco 1 - Networking Basics
What problems are associated with impedance mismatches in copper cabling?
(Choose two.)
Perrine. J
1.
jitter
2.
signal absorption
3.
termination of signals
4.
reflection
5.
NEXT
5/24/2017
Page 19
Chapter 4
Cisco 1 - Networking Basics
What problems are associated with impedance mismatches in copper cabling?
(Choose two.)
Perrine. J
1.
jitter
2.
signal absorption
3.
termination of signals
4.
reflection
5.
NEXT
5/24/2017
Page 20
Chapter 4
Cisco 1 - Networking Basics
Which of the following are tests specified by the TIA/EIA-568-B standard for
copper cable? (Choose three.)
Perrine. J
1.
signal harmonics
2.
cable length
3.
wire map
4.
signal absorption
5.
conductive response
6.
propagation delay
5/24/2017
Page 21
Chapter 4
Cisco 1 - Networking Basics
Which of the following are tests specified by the TIA/EIA-568-B standard for
copper cable? (Choose three.)
Perrine. J
1.
signal harmonics
2.
cable length
3.
wire map
4.
signal absorption
5.
conductive response
6.
propagation delay
5/24/2017
Page 22
Chapter 4
Cisco 1 - Networking Basics
How can the problem of electrical noise be avoided?
Perrine. J
1.
By installing surge suppressors on every network device
2.
By making sure all electrical devices are FCC and UL listed
3.
By getting a single power transformer dedicated to your LAN
4.
By limiting the number and type of electrical devices near the LAN
5/24/2017
Page 23
Chapter 4
Cisco 1 - Networking Basics
How can the problem of electrical noise be avoided?
Perrine. J
1.
By installing surge suppressors on every network device
2.
By making sure all electrical devices are FCC and UL listed
3.
By getting a single power transformer dedicated to your LAN
4.
By limiting the number and type of electrical devices near the LAN
5/24/2017
Page 24
Chapter 4
Cisco 1 - Networking Basics
For what purpose are two y-axis inputs used when displaying voltage patterns on
an oscilloscope?
Perrine. J
1.
to insure a clean signal is obtained
2.
to determine if one is primary and one is backup
3.
to display multiple time frames
4.
to analyze a complex spectrum
5.
to observe and measure two waves simultaneously
5/24/2017
Page 25
Chapter 4
Cisco 1 - Networking Basics
For what purpose are two y-axis inputs used when displaying voltage patterns on
an oscilloscope?
Perrine. J
1.
to insure a clean signal is obtained
2.
to determine if one is primary and one is backup
3.
to display multiple time frames
4.
to analyze a complex spectrum
5.
to observe and measure two waves simultaneously
5/24/2017
Page 26
Chapter 4
Cisco 1 - Networking Basics
What type of analysis is performed by using an oscilloscope?
Perrine. J
1.
power-domain
2.
frequency-domain
3.
time-domain
4.
wave-domain
5.
spectrum-domain
6.
signal-domain
5/24/2017
Page 27
Chapter 4
Cisco 1 - Networking Basics
What type of analysis is performed by using an oscilloscope?
Perrine. J
1.
power-domain
2.
frequency-domain
3.
time-domain
4.
wave-domain
5.
spectrum-domain
6.
signal-domain
5/24/2017
Page 28
Chapter 4
Cisco 1 - Networking Basics
How are binary ones and zeros represented in fiber optic installations? (Choose
two.)
Perrine. J
1.
+5 volts/-5 volts
2.
0 volts/5 volts
3.
light/no light
4.
high to low electrical transition
5.
low to high electrical transition
6.
increasing/decreasing light intensity
5/24/2017
Page 29
Chapter 4
Cisco 1 - Networking Basics
How are binary ones and zeros represented in fiber optic installations? (Choose
two.)
Perrine. J
1.
+5 volts/-5 volts
2.
0 volts/5 volts
3.
light/no light
4.
high to low electrical transition
5.
low to high electrical transition
6.
increasing/decreasing light intensity
5/24/2017
Page 30
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