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How does AC line noise create problems?
How does AC line noise create problems?
By adding unwanted voltage to the desired signal
What important feature should wall/ceiling openings for
conduit have if the conduit contains network cabling?
What important feature should wall/ceiling openings for
conduit have if the conduit contains network cabling?
They should be sealed with smoke- and flame-retardant
materials that meet all codes.
What happens if you touch two objects with different
potential voltages
What happens if you touch two objects with different
potential voltages
You complete the circuit and get a shock
What is the POP?
What is the POP?
Point of Presence – where the telephone service enters the
building.
What network device is used in an extended star
topology when the catchment area of one
wiring closet is not enough?
What network device is used in an extended star
topology when the catchment area of one
wiring closet is not enough?
Repeater
How can UTP backbone cabling facilitate entry of lightning into a building?
How can UTP backbone cabling facilitate entry of lightning into a building?
The copper provides a pathway for lightning to enter
the building.
What is the TIA/EIA standard that specifies backbone
cabling?
What is the TIA/EIA standard that specifies backbone
cabling?
568-A
What is the first step in locating a wiring closet for
a network?
What is the first step in locating a wiring closet for
a network?
Identify on a floor plan, all devices that will be connected
to the network
When starting to design a network, what should be
the first step in the process?
When starting to design a network, what should be
the first step in the process?
Collecting information about the organization.
What is the “one-hand rule”?
What is the “one-hand rule”?
Only touch electrical devices with one hand at a time to
prevent electricity from flowing through your body.
Does electricity flow from negative to positive or positive
to negative?
Does electricity flow from negative to positive or positive
to negative?
Negative to positive
Why are common mode problems a hazard to you
or you computer?
Why are common mode problems a hazard to you
or you computer?
They go directly to the computer chassis.
Why should fluorescent light fixtures be avoided in
wiring closets?
Why should fluorescent light fixtures be avoided in
wiring closets?
They generate outside interference.
What kind of floor should the wiring room have?
What kind of floor should the wiring room have?
Tile or other finished surface
Which type of networking media is now installed
most often for backbone cabling?
Which type of networking media is now installed
most often for backbone cabling?
62.5/125 micron fiber optic cable
What is the purpose of the safety ground in a
computer?
What is the purpose of the safety ground in a
computer?
Prevents metal parts from becoming energized with a
hazardous voltage
What best describes the problems caused by
electrostatic discharge (ESD)?
What best describes the problems caused by
electrostatic discharge (ESD)?
It destroys semiconductors and data.
What best describes the difference between AC and
DC?
What best describes the difference between AC and
DC?
DC flows at a constant value, whereas AC rises and falls.
What kind of power disturbances can be caused by lightning
strikes?
What kind of power disturbances can be caused by lightning
strikes?
Surges
If ACME Inc. occupies the first three floors of a
building and each floor is 1500 square meters, how
many wiring closets should be installed
according to EIA/TIA 569?
If ACME Inc. occupies the first three floors of a
building and each floor is 1500 square meters, how
many wiring closets should be installed
according to EIA/TIA 569?
66
What problem could be caused by a faulty ground
wire connection at an outlet that is used by
networking equipment?
What problem could be caused by a faulty ground
wire connection at an outlet that is used by
networking equipment?
There would be potentially fatal voltages between the LANs UTP cabling and the chassis of a networking
device.
How can the problem of electrical spikes be
addressed?
How can the problem of electrical spikes be
addressed?
Surge suppressors
What is a brownout?
What is a brownout?
When 80% less than normal electricity is available.
Where should the main distribution facility (MDF) be located in a multi-story
building using an extended star topology?
Where should the main distribution facility (MDF) be located in a multi-story
building using an extended star topology?
On one of the middle floors
In what types of situations will a safety ground connection not be
sufficient?
In what types of situations will a safety ground connection not be
sufficient?
When ground wires in separate locations have
slightly different potential.
What is a common cause of oscillation often called
harmonics?
What is a common cause of oscillation often called
harmonics?
Excessively long electrical wiring runs
What is a MOV?
What is a MOV?
A type of surge protector. It can absorb large currents without
damage
