​During termination of twisted pair cabling, what should be done to ensure minimal cross talk is introduced?
answer
No more than 1 inch of the cable should be exposed.
question
​If the use of a pre-existing Ethernet infrastructure is desired for a SAN, what Transport Layer protocol should be utilized?
answer
iSCSI
question
The portion of an Ethernet network in which collisions could occur if two nodes transmit data at the same time.​
answer
Collision domain
question
In a chassis, the path along which air from a cool air source is conducted, past equipment to cool it, and then out of the rack. Typically, air moves from front to back.
answer
airflow
question
A specialized storage device or group of storage devices that provides centralized fault-tolerant data storage for a network.​
answer
NAS (Network attached storage)
question
The industry-standard unit for measuring rack height. Standard racks are 42U tall—about 6 feet.
answer
rack unit (RU)
question
The field in a frame responsible for ensuring that data carried by the frame arrives intact. It uses an algorithm, such as CRC, to accomplish this verification.​
answer
FCS (frame check sequence)
question
A device that converts DC electrical energy to AC electrical energy. Better inverters will also condition the power, which helps protect sensitive electronic equipment from power fluctuations. ​
answer
inverter​
question
A device that maintains a constant voltage level for either AC or DC electrical energy.
answer
voltage regulator
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Electrical power flow on a circuit that continually switches direction.
answer
alternating current (AC)​
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A device that changes the form of electrical energy in some way. Four common types are inverter, rectifier,
transformer, and voltage regulator.
answer
power converter​
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The flow of electrical power at a steady rate in only one direction.​
answer
direct current (DC)​
question
​One watt is equal to how many volt-amps?
answer
1.4
question
What cable type comes in two different modes, single mode and multimode?
answer
Fiber optic
question
​What component of the backbone runs between a building's floors and can be used to connect an MDF and IDF or multiple IDFs?
answer
vertical cross connect
question
What is the maximum allowable distance for horizontal wiring?
answer
100 m
question
Which method of transmission allows signals to travel in both directions over a medium but in only one direction at a time?
answer
Half duplex
question
A NIC card cannot determine whether the frames it transmits and receives are using IP packets or a different layer 3 protocol, because the NIC does not operate higher than Layer 2 of the OSI model.​
answer
True
question
A _____________ allows for an MTU as high as 9198 bytes.​
answer
Jumbo frame
question
A power fluctuation that results in a temporary dimming of lights is known as a blackout.​
answer
False
question
A volt-ampere (VA) is the product of the voltage and the ________________ of the electricity on a line.​
answer
Current
question
Cable that is coated with flame-resistant polyvinyl chloride (PVC) is acceptable for use in plenum areas.
answer
False
question
Describe the differences between a brownout and a blackout.​
answer
A brownout is a ​momentary decrease in voltage; also known as a sag. An overtaxed electrical system can cause brownouts, which you might recognize in your home as a dimming of the lights. Such voltage decreases can cause computers or applications to fail and potentially corrupt data. A blackout is a complete power loss. A blackout could cause significant damage to your network. For example, if a server loses power while files are open and processes are running, its NOS might be damaged so extensively that the server cannot restart and the NOS must be reinstalled from scratch. A backup power source, however, can provide power long enough for the server to shut down properly and avoid harm.
question
Describe the three different types of cabling recognized by TIA/EIA as acceptable for horizontal wiring.​
answer
TIA/EIA recognizes three possible cabling types for horizontal wiring: UTP, STP, or fiber optic cable. UTP (unshielded twisted pair) cable is a type of copper-based cable that consists of one or more insulated twisted-wire pairs encased in a plastic sheath. STP (shielded twisted pair) cable is a type of copper-based cable containing twisted-wire pairs that are not only individually insulated, but also surrounded by a shielding made of a metallic substance such as foil. Fiber-optic cable is a form of cable that contains one or several glass or plastic fibers in its core and comes in two types: single-mode fiber (SMF) or multimode fiber (MMF). Copper-based cable transmits data via electric signals, and fiber-optic cable transmits data via pulsing light sent from a laser or light-emitting diode (LED).
question
Each type of cable has a prescribed bend radius , which is the radius of the maximum arc into which you can loop a cable without impairing data transmission.
answer
True
question
Equipment racks most commonly come in what two widths?​
answer
19 and 23 inch frame
question
Ethernet exists at what layer of the OSI model?​
answer
Layer 2
question
Explain how equipment should be configured in a rack to best optimize airflow and temperature.​
answer
Hardware should be installed as close to the front of the rack as possible to allow for proper airflow in the back. Minimizing cable clutter can also help prevent airflow blockages. In a typical rack system, airflow through the chassis is typically designed to move from front to back. Rack-monitoring systems should be installed to sound an alarm if the rack' s overall temperature rises too much, if air quality (moisture or smoke) falls below acceptable levels, or if airflow is restricted. Because rack security is also a concern, these monitoring systems can alert technicians when a door is left open, or use motion sensors to detect the presence of an intruder. In data rooms containing multiple rows of racks, a hot aisle/cold aisle layout, pulls cool air from vents in the floor or from nearby, low-lying wall vents into the rows of racks. The hot air aisles are used to direct the heated air away from the racks into exhaust vents for cooling.
question
Explain the difference between an inverter and a rectifier.
answer
Inverter-Converts DC to AC
Rectifier-converts AC to DC
question
How far away from fluorescent lights or other sources of EMI should cable be installed?​
answer
At least 3 feet
question
In order to simplify console access to computers in a rack, what device is typically used to provide a central portal for all devices on the rack?​
answer
KVM switch
question
Select the component of enterprise level structured cabling that serves as the location where an incoming network interface enters a building and connects with the building's backbone cabling:
answer
Entrance faculty
question
Select the maximum allowable distances for horizontal wiring for a span that connects a data jack on a wall to a data closet, and for a span that connects a workstation to the data jack, respectively:
answer
90 m and 10 m
question
Select the two Transport Layer protocols that are used by SANs:​
answer
Fibre Channel and iSCSI
question
Select the two terms below that are used to describe a UPS that provides continuous voltage to a device by switching virtually instantaneously to the battery when it detects a loss of power:​
answer
Standby UPS and failover power supply
question
The TIA/EIA standard for wall jacks in a work area require that at least one outlet be provided for data and one for voice.​
answer
True
question
The radius of the maximum arc into which you can loop a cable without impairing data transmission is known as what option below?​
answer
Bend Radius
question
The room where the _________________ is located is called the data closet.
answer
Main Distribution Frame (MDF)
question
The standard that describes uniform, enterprise-wide cabling systems, regardless of who manufactures or sells the various parts used in the system, can be referred to by what two options below?​
answer
TIA/EIA-568 and IEEE Commercial Building Wiring Standard
question
To ensure that any _____________ are detected, frames are made large enough to fill the entire cable during transmission.​
answer
Collisions
question
What is the industry standard for rack height in rack units?​
answer
42U
question
What is the maximum frame size ​for Ethernet II frames on a VLAN?
answer
1522 bytes
question
What steps should be taken to manage documentation at a cabling plant?​
answer
​Follow these guidelines to manage documentation at your cabling plant:
Keep your cable plant documentation in a centrally accessible location. Make sure it includes locations, installation dates, lengths, and grades of installed cable.
Label every data jack or port, patch panel or punch-down block, and connector or circuit.
Use color-coded cables for different purposes and record the color schemes in your documentation. Cables can be purchased in a variety of sheath colors. For example, you might want to use pink for patch cables, green for horizontal wiring, purple for DMZ lines, and gray for vertical (backbone) wiring.
Be certain to update your documentation as you make changes to the network. The more you document, the easier it will be to move or add cable segments in the future.
question
What type of power converter changes the voltage of an AC current, such as when power over the main line from an electric company is changed before being delivered to a home?​
answer
Transformer
question
What type of power flaw involves a fluctuation in voltage levels caused by other devices on the network or by EMI?​
answer
Noise
question
When selecting a punch down block, what block type is more suitable for data connections?​
answer
110 block
question
Where is a demarc located in relation to the structured cabling of an enterprise environment?​
answer
In the Main Distribution Frame (MDF)
question
Which method of transmission allows signals to travel in both directions over a medium simultaneously?​
answer
Full-duplex
question
Which of the following options is not a likely source of electromagnetic interference?​
answer
Fiber optic cables
question
_______ are highly scalable and have a very high fault tolerance, massive storage capabilities, and fast data access.
answer
SANs
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