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1
What is the purpose of a "flashlight test"?
to verify the integrity of the data sent over an active fiber-optic cable
to confirm that a fiber-optic cable is functional before installation
to ensure that a fiber-optic cable has been properly labeled by the manufacturer
to check the smoothness of a fiber cleaving by the reflection of light off of the end of the fiber
2
In which process is information from each data channel allocated bandwidth based on the signal frequency of the traffic?
time-division multiplexing
asynchronous time-division multiplexing
statistical multiplexing
frequency-division multiplexing
3
In fiber-optic cable, which material typically surrounds the buffer and prevents the fiber cable from being stretched when the cab
being pulled?
PVC
silica
aramid yarn
fiber cladding
4
Which type of media is immune to EMI?
UTP cable
STP cable
coax cable
fiber-optic cable
5
When fiber-optic circuits are used in trunk connections between cities, which information transfer rate can be achieved?
1.544 Mbps
1000 Mbps
2.5 Gbps
64 Gbps
6
A light beam going through an interface between two dissimilar media returns into the medium from which it originated. Which te
describes the change of direction of a light beam?
absorption
refraction
reflection
amalgamation
7
Which of the following is a disadvantage of fiber-optic cable?
It is less expensive than copper media.
Fiber cable is more forgiving of abuse than copper media.
Fiber connectors are more forgiving than copper connectors.
Installation tools and meters are more expensive.
8
What is the minimum number of fiber strands in a fiber-optic circuit used for networking?
1
2
3
4
9
What should be used to clean fiber optic connectors?
a soft cloth
water and a cotton swab
a lens cloth
warm, soapy water
10 Which process takes multiplexed data channels at the destination and separates them into multiple data channels?
simplexing
multiplexing
demultiplexing
duplexing
11 Which process takes multiple data channels and combines them into a single data source?
simplexing
multiplexing
demultiplexing
encoding
12 What are advantages of using fiber-optic cable instead of copper cabling? (Select three.)
electromagnetic immunity
low cost
high attenuation
increased bandwidth potential
small diameter
13 What is the purpose of the cladding on glass fiber?
to keep the fiber from bending too far
to trap the light in the fiber core
to protect the fiber from outside light interference
to provide a higher refractive index
14 What are the five elements that make up the fiber-optic cable?
core, cladding, buffer, strength material, and outer jacket
core, cladding, kevlar, strength material, and outer jacket
core, kevlar, buffer, strength material, and outer jacket
aramid yarn, cladding, buffer, strength material, and outer jacket
15
Which types of fiber-optic cable have the same jacket shape as shown in the graphic above? (Select two.)
distribution
subgroup
zipcord
round duplex
aerial
hybrid
16 What is the minimum bend radius that should be provided for connectors used in fiber-optic enclosures?
2.5 cm
5 cm
7.5 cm
10 cm
17 What are the common wavelengths of the light emitting diode?
850 nm or 1300 nm
850 nm or 1310 nm
1310 nm or 1550 nm
1300 nm or 1310 nm
18 Why is installing fiber-optic cable less expensive than copper in the long run?
Less equipment is required to use fiber cable than copper cable.
Fiber can be upgraded to higher speeds without installing more cable.
Fiber is easier to install than copper.
Installing more runs of copper wire is very expensive.
19 How are binary ones and zeros encoded in a light beam?
as high and low voltage
as on and off
as bright and dim
as different wavelengths
20 Which of the following is an advantage of fiber-optic cable?
high attenuation
shorter cable runs
security
less expensive than copper media
21 Which type of fiber is primarily used for outside-plant installations?
cross-tube cable
loose-tube cable
split-tube cable
tight-buffered cable
22 Which type of fiber-optic connector is recommended by the ANSI/TIA/EIA 568B.3 standard?
RJ-45
duplex ST
BNC
duplex SC
23 Which term describes the bending of a light beam through an interface between two dissimilar materials?
reflection
refraction
absorption
amalgamation
24 Which type of cabling is most frequently used for indoor backbone, risers, horizontal, and plenum installations?
multimode fiber, tight-buffered
multimode fiber, loose-buffered
single-mode fiber, tight-buffered
single-mode fiber, loose-buffered
25 For Fast Ethernet, what is the maximum length that single-mode fiber can run before a repeater is needed?
2000 meters
2500 meters
3000 meters
3500 meters
26 Which of the following is a characteristic of single-mode fiber-optic cable?
generally uses LEDs as the light source
relatively larger core with multiple light paths
less expensive than multimode
generally uses lasers as the light source
27 Which process takes information from each data channel and allocates bandwidth based on pre-assigned time slots?
time-division multiplexing
asynchronous time-division multiplexing
frequency-division multiplexing
wavelength-division multiplexing
28 What are the common wavelengths of a laser?
850 nm or 1300 nm
850 nm or 1310 nm
1310 nm or 1550 nm
1300 nm or 1310 nm
29 What is the most common use of single-mode fiber-optic cable?
workstation connections
LAN backbones within building
interbuilding connectivity
voice connections
30 What is the refractive index?
the measurement of the angle of refraction between air and another substance
the optical density of a particular grade of glass
the ratio between the speed of light in a vacuum and the speed of light in another medium
the percentage of light that is reflected from the surface of a material
31 What is the diameter of the fiber-optic core in standard multimode fiber cable?
6.25 microns
62.5 microns
12.5 microns
125 microns