# Shared Flashcard Set

## Details

Chapter 3 Network ++ Guide
Chapter 3 Network ++ Guide
47
Computer Networking
02/19/2008

Term
 What does the term TRANSMIT mean?
Definition
 To issue signals to the network medium.
Term
 Transmission refers to what?
Definition
 either the process of transmitting or the progress of signals after they have een transmitted.  In other words you could say "My NIC transmitted a message, but because the network is slow, the transmission took 10 seconds to reach the server."
Term
 What are Volts?
Definition
 Strength of an electrical current. This is what analog and digital are measured in.
Term
 When talking about strength of a volt it is called a ?
Definition
 voltage
Term
 A wave is measured by its strength at any given point in time. This is called____?
Definition
 amplitude
Term
 What is frequency?
Definition
 the number of times that a waves aqmplitude 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.
Term
 Define hertz(Hz)
Definition
 cycles per second. This is what defines frequency
Term
 What does phase refer to?
Definition
 The progress of a wave over time in relationship to a fixed point.
Term
 What is wavelength?
Definition
 Wavelength is the distance between corresponding points on a waves cycle.
Term
 What is noise?
Definition
 Noise is any type of interference that may degrade a signal.
Term
 What are digital signals?
Definition
 Composed of pulses of precise, positive voltages and zero voltages.
Term
Definition
 Is is the term used by networking professionals to describe the nondata information that must accompnay data for a signal to be properly routed and interpreted by the network.
Term
 What is a modem?
Definition
 A modem is a device that functions as a modulator/demodulator. It modulates digital signals into analog signals at the transmitting end, then demodulates analog signals into digital signals at the receiving end.
Term
 What is modulation?
Definition
 A simple wave called a carrier wave is combined with another analog signal to produce a unique signal that gets transmitted from one node to another. Used in FM(frequency modulation)
Term
 What is FM?
Definition
 Frequency modulation. In which data much travel along a particular frequency. (Radio)
Term
 What is AM?
Definition
 The amplitude of the carrier signal is modified by the application of the data signal.
Term
 What is simplex?
Definition
 When signals may travel in only one direction
Term
 What is half-duplex transmission?
Definition
 signals may travel in both directions over a medium but in only one direction at a time.
Term
 What does full-duplex mean? Sometimes called simple duplex or bidirectional transmission.
Definition
 Signals are free to travel in both directions over a medium simultaneously.
Term
 What is a channel?
Definition
 It is a distinct communciation path between nodes, much as a lane is a distinct transportation path on a freeway.
Term
 A form of transmission that allows multiple signals to travel simultanelously over one medium is known as ____________?
Definition
 multiplexing
Term
 To carry multiple signals, the medium's channel is logically separeted into multiple smaller channels called_______. (referring to mulitplexxing)
Definition
 subchannels
Term
 A required device that combines multiple signals into one channel at the sending end is called a _______
Definition
 multiplexer or MUX
Term
 A required device that combines multiple signals into one channel at the recieving end is called a _______
Definition
 demultiplexer or demux
Term
 What is TDM?
Definition
 Time Division Multiplexing, it divides the channel into multiple intervals of time, or time slots.
Term
 What is statistical multiplexing?
Definition
 Is similar to time divisoon miltiplexing but rather than assigning a separate slot to each node in succession the transmitter assigns slots to nodes according to priority and need.
Term
 What is WDM?
Definition
 Wavelength division multiplexing is a technology used with fiber-optic cable. uses one fiber-optic connection to carry multiple light signals simultaneously.
Term
 What is DWDM?
Definition
 (Dense Wavelength Division Multiplexing) A single fiber in a fiber-optic cable can carry between 80 and 160 channels. Most modern fiber optic network.
Term
 What is point-to-point transmission?
Definition
 When a data transmission involves only one transmitter and only one reciever it is considered point to point.
Term
Definition
 Broadcast involves one transmitter and multiple recivers. For example, a tv station sends its signal to thousands of users.
Term
 What is webcasting?
Definition
 Sending multiple video broadcasts to multiple nodes.
Term
 What does throughput, capacity and bandwidth mean?
Definition
 Throughput is the measure of how much data is transmitted during a given period of time. It may also be called capacity or bandwidth.
Term
 What is bandwidth?
Definition
 It is the measure of the difference between the highest and lowest frequencies that a medium can transmit.
Term
Definition
 It is the form of transmission in which signals are modulated as radio frequency analog waves that use different frequency ranges.
Term
 What is EMI?
Definition
 Electromagnetic interference.
Term
 What is RFI?
Definition
Term
 What is crosstalk?
Definition
 It occurs when a signal traveling on one wire or cable infringes on the singal traveling over an adjacent wire or cable.
Term
 What is attenuation?
Definition
 Loss of a signal or strength.
Term
 What is an amplifier?
Definition
 Electronic device that increases voltage or strength.
Term
 What is a repeater?
Definition
 A device that regenerates a digital signal.
Term
 Explain Regeneration.
Definition
 When digital signals are repeated they are actually retransmitted in their original form without the noise they may have accumulated previously. This is called regeneration.
Term
 What is latency?
Definition
 Latency is referred to as delay. Time it takes to get from one place to another.
Term
 What is a populated segment?
Definition
 It is part of a network that contains end nodes.
Term
 What is an unpopulated segment?
Definition
 Also known as a link segment, it is part of the network that does not contain any end nodes, but simply connects two networking devices such as hubs.
Term
 What is media converter?
Definition
 Is a peice of hardware that enables networks or segments running on different media to interconnect and exchange signals.
Term
 What is a transceiver?
Definition
 A device that transmits and recieves signals. It is also known as a media converter.
Term
 What is conduit or pipeline?
Definition
 Use to help further protect and ward off interference of noise caused by possible EMI or maybe RMI.
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