Network + Ch 5 RQ – Flashcards
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When an Ethernet NIC has been configured by the OS to use half-duplex, the transmit pair of the cable uses___________ transmissions, the receive pair in the cable uses ___________ transmissions, and the twisted-pair in the cable uses ___________transmissions.
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Simplex, simplex and half-duplex
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Which of the following is not an example of a broadband transmission?
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ethernet
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Which kind of multiplexing assigns slots to nodes according to priority and need?
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Statistical multiplexing
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Which type of transmission is measured by baud rate?
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Analog
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What kind of cable uses BNC connectors? F-connectors? Which connector is likely to be used by cable TV?
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Coaxial cable, coaxial cable, and F- connector
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Which categories of twisted-pair cable can support Gigabit Ethernet?
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Cat5e or higher
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What is the earliest-pair cabling standard that meets the minimum requirements for 10Gbase-T transmissions?
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cat 6a
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Which type of cross-talk occurs between wire pairs near the source of a signal?
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Near end cross-talk (NEXT)
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What device can boost an analog signal? A digital signal?
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amplifier and repeater
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Which part of a toner and probe kit emits a tone when it detects electrical activity on wire pair?
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probe
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What are the four fundamental properties of an analog signal?
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Amplitude - A measure of a signal's strength
frequency - the number of times a wave's amplitude cycles
wavelength - the distance between corresponding points on the wave's cycle
phase - the progress of a wave over time
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What does a modem do?
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The modem connects to your ISP, which typically provides either cable or DSL Internet service
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What is twist ratio and why is it important?
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The number of twist per meter is know as twist ratio. The more twist per meter, the more it is resistant to cross talk.
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What fiber is used in fiber-optic cabling to protect the inner core and prevent the cable from stretching?
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Kevlar (polymeric fiber)
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What characteristic of optical transmissions is primarily responsible for the distance limitations of fiber-optic cabling?
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Cost and Optical loss
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Why is SMF more efficient over long distances than MMF?
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Signals traveling over multi mode fiber experience greater attenuation than those traversing single mode.
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Why do APC ferrules create less back reflection than do UPC ferrules?
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the end faces are placed at an angle to each other.
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What does a fiber cleaver do?
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It is part of the Terminate fiber-optic cable process
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How is latency measured and in what unit?
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The delay from when the data leave the source and when it arrives, the unit is called RTT (round trip time)
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What is the difference between short circuits and open circuits?
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A short circuit is an unwanted connection, such as when exposed wires touch each other. An open circuit is one where needed connections are missing, such as when a wire breaks.
