N+ Chapter 5 Review – Flashcards
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A _____ is a simple instrument that can measure many characteristics of an electric circuit, including resistance, voltage, and impedance
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multimeter
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A _____ reverses all the wires without regard to how they're paired
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rollover cable
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A ______ is a device that transmits digital signal in its original form
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repeater
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A ______ is a voltage, frequency, pulse, or phase change in an analog transmission
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symbol
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______ causes problems only when a receiving node is expecting some type of communication, such as the rest of the data stream it has begun to accept>
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latency
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A ____ Physical layer standard for networks that achieves 1 Gbps over Cat 6 or better cabling using only two pairs of wires.
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1000Base-LX
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A character encoding system consisting of 128 characters.
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ASCII
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A term used to refer to a type of twisted-pair cable. All of the category cables fall under the TIA/EIA 568 standard.
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Cat (category)
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A form of transmission that allows multiple signals to travel simultaneously over one medium.
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multiplexing
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An unwanted connection, such as when exposed wires touch each other.
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short circuit
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A physical layer standard for networks that specifies 1-Gbps transmission over fiber-optic cable using baseband transmission. Reliance on long wavelengths of 1300 nanometers
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1000Base LX
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The distance between corresponding points on a wave's cycle, expressed in meters or feet.
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wavelength
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Cross-talk measured at the far end of the cable from the signal source.
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Far end cross-talk
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The amount of data that a medium transmits during a given period of time.
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throughput
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A multiplexing technique used over single-mode or multimode fiber-optic cable in which each signal is assigned a different wavelength for its carrier wave.
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DWDM (Dense Wavelength Division Multiplexing)
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What is the maximum supported throughput of a CAT6 cable?
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10Gbps
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What Ethernet standard below is also referred to as "thinnet"?
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10Base2
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A measure of a signal's strength at any given time is known as which term below?
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amplitude
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How many cable pairs are needed for 1000Base-T transmission over CAT5e cable?
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4
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Ethernet is an example of what type of technology?
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baseband
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Standard PoE devices must be provided with how much power in order to function?
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15.4 watts
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Which option below reflects the standard impedance of an RG-6 cable?
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75 Ohms
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The most common multiplexing technology used in conjunction with fiber optics is which option below?
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DWDM
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What type of cross-talk occurs between wire pairs near the source of a signal?
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near end cross talk
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Which type of multiplexing is defined by wavelength instead of frequency?
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CWDM
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What is the minimum category of UTP cable required in order to support Gigabit speeds?
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Cat 5e
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What is the maximum distance for 10GBase-ER and 10GBase-EW on a segment of single mode fiber?
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40km
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Using a form of transmission that allows multiple signals to travel simultaneously over one medium is known as which of the following options?
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multiplexing
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A device that is responsible for modulating digital signals into analog signals, and demodulating analog signals into digital signals at the receiving end, is known as?
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A modem
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The number of times that a wave's amplitude cycles from its starting point, through its highest amplitude and its lowest amplitude, and back to its starting point over a fixed period of time, is known as what term below?
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frequency
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Which of the following connectors is the most common for multimode fiber?
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MT-RJ
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WDM divides a beam of light into how many different wavelengths or colors?
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40
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What term below is used to describe the outer-most layer of protective covering of a coaxial cable?
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sheath
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Since cable TV and cable Internet can share the same coaxial cable, they are considered to be what type of technology?
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broadband
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Phone companies make use of what type of multiplexing in order to allow for phone services and DSL services over the same line?
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FDM
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Frequencies used to convey speech over telephone lines fall between what two frequencies below?
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300 Hz , 3.3 KHz
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What is the maximum supported throughput and bandwidth / signal rate of Cat 5e?
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350 MHz, 1000 Gbps
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What two items below are commonly expressed as bits transmitted per second?
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Bandwith, throughput
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Using DWDM, a single fiber can carry between what two numbers of channels?
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160, 80
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What two connector types are typically used to terminate RG-6 and RG-59 cables?
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f-connectors, BNC
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Because digital signals do not depend on amplitude or frequency differences to communicate information, they are more vulnerable to EMI noise.
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False
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A serial cable with an RJ-45 connector is capable of being used through an RJ-45 Ethernet port.
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False
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A continuity tester should not be used on a live network segment.
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True
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Digital signals are composed of pulses of precise, positive voltages and zero voltages.
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True
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Multimode fiber contains a core that is larger than a single mode fiber core.
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True
