CHAPTER 4
1. A company needs to
extend the LAN to six separate buildings. To limit the amount of signal
attenuation on the LAN media, what type of media would be the best to use
between the buildings?
a. air
(wireless)
b. coaxial
cable
c. fiber#
d. shielded
twisted pair
e.
unshielded twisted pair
2. A small company is
experiencing difficulties on its LAN. After performing some tests, a technician
has determined that the copper media supporting the LAN is experiencing
abnormal attenuation. What are two possible causes of the problem? (Choose
two.)
a.
defective connectors#
b.
excessively long cable lengths#
c. use of
higher grade cabling
d. low
frequency signals used in the media
e. network
cable runs isolated from other cables
3. What is a cause of
crosstalk in UTP cable?
a. cable
pairs that are shorted
b. cable
pairs crossed during termination
c. cabling
runs installed in separate conduit
d. cable
pairs that are untwisted because of poor termination of the cable#
4. Which of the
following describes frequency?
a. length
of each wave
b. height
of each wave
c. number
of cycles each second#
d. amount
of time between each wave
5. How are binary
ones and zeros represented in fiber optic installations? (Choose two.)
a. +5
volts/-5 volts
b. 0
volts/5 volts
c. light/no
light#
d. high to
low electrical transition
e. low to
high electrical transition
f.
increasing/decreasing light intensity#
6. What factors need
to be considered to limit the amount of signal attenuation in Ethernet cable
runs? (Choose two.)
a. type of
users
b. number
of users
c. length
of cable#
d. type of
electrical equipment
e.
installation of connectors on the cable#
7. Which of the following
are detected by the wire map test? (Choose three.)
a. near-end
crosstalk (NEXT)
b. opens#
c.
propagation delay
d. return
loss
e.
reversed-pair faults#
f. short
circuits#
8. To ensure reliable LAN communications, what should a
technician be looking for when attaching connectors to the ends of UTP cable?
a. that the
white-orange/orange pair is attached first
b. that the
wire pairs remain twisted as much as possible#
c. that one
end of the shield is properly ground but not the other
d. that 50
ohm termination resistors are on both ends
9. What conditions
are described when transmission signals from one wire pair affects another wire
pair? (Choose two.)
a. noise#
b.
resistance mismatch
c. jitter
d.
crosstalk#
e.
attenuation
10. What is expected
when crosstalk is present in networks with higher transmission frequencies?
(Choose two.)
a. jitter
b. increase
in crosstalk#
c. higher
signal attenuation
d.
increases in cancellation effect#
e.
destruction of more of the data signal
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