# Shared Flashcard Set

## Details

Networking Fundamentals
Transmission Basics and Networking Media
45
Computer Networking
07/20/2010

Term
 Voltage
Definition
 The strength of a n electrical signal is directly proportional to its __________.
Term
 Wavelength
Definition
 The distance between corresponding points on a wave's cycle is called its ________.
Term
 Binary
Definition
 the use of 1s and 0s to represent information is characteristic of a _______ system.
Term
 Bit
Definition
 Every pluse in a digital signal is a ____.
Term
 1
Definition
 A digital signal is composed of a pulse of positive voltage represents a __.
Term
 Convert Binary to Decimal
Definition
 To convert a byte to a decimal number, determine the value represented by each bit, then addthose values together. If a bit in the byte is 1 (in other words, if it’s “on”), the bit’s numericalequivalent in the coding scheme is added to the total. If a bit is 0, that position has no valueand nothing is added to the total. For example, the byte 11111111 equals: 1 × 27 + 1 × 26 +1 × 25 + 1 × 24 + 1 × 23 + 1 × 22 + 1 × 21 + 1 × 20, or 128 + 64 + 32 + 16 + 8 + 4 + 2 + 1.Its decimal equivalent, then, is 255. In another example, the byte 00100100 equals: 0 × 27 +0 × 26 + 1 × 25 + 0 × 24 + 0 × 23 + 1 × 22 + 0 × 21 + 0 × 20, or 0 + 0 + 32 + 0 + 0 + 4 + 0 +0. Its decimal equivalent, then, is 36.
Term
Definition
 is a term used by networking professionals to describe the nondata information that must accompany data for a signal to be properly routed and interpreted by the network.
Term
 Modulation
Definition
 can be used to make a signal conform to a specific pathway.
Term
 Half-Duplex
Definition
 In _________ transmission, signals may travel in both directions over a medium but in only one direction at a time.
Term
 Modulation
Definition
 Technology used to modify analog signals to make them suitable for carrying data over a communication path is called ___________.
Term
 Full-Duplex
Definition
 When signals are free to travel in both directions over a medium simultaneously, the transmission is considered _________.
Term
 FDM (Frequency Division Multiplexing)
Definition
 Is a type of multiplexing that assigns a unique frequency band to each communications subchannel. Signals are modulated with different carrier frequencies, then multiplexed to simultaneously travel over a single channel.
Term
 WDM (Wavelength division multiplexing)
Definition
 is a technology used with fiber-optic cable, which enables one fiber-optic connection to carry multiple light signals simultaneously.
Term
 Point-to-multipoint
Definition
 Transmission involves one transmitter and multiple receivers.
Term
Definition
 Transmission involves one transmitter and multiple, undefined receivers.
Term
Definition
 Transmission issues signals to multiple, defined recipients.
Term
 Throughput
Definition
 The data transmission characteristic most frequently discussed and analyzed networking professionals is ____________.
Term
Definition
 In ____________ transmission signals are modulated as radio frequency (RF) analog waves that use different frequency ranges.
Term
 Baseband
Definition
 Typically in ___________ transmission, digital signals are sent through direct current (DC) pulses applied to the wire.
Term
 Baseband
Definition
 Ethernet is an example of a ________system found on many LAN's.
Term
 Noise
Definition
 One of the most common transmission flaws affecting signal is _______.
Term
 EMI (electromagnetic interference)
Definition
 is a common source of noise.
Term
 Crosstalk
Definition
 Occurs when a signal traveling on one wire or cable infringes on the signal traveling over an adjacent wire or cable.
Term
 Throughput
Definition
 The most significant factor in choosing a transmission method is it's __________.
Term
 Populated Segment
Definition
 Part of a network that contain end nodes is a _____________.
Term
 Populated Segment
Definition
 Part of a network that contain end nodes is a _____________.
Term
 Unpopulated Segment
Definition
 Part of the network that does not contain end nodes is an __________.
Term
 Maximum Length
Definition
 The maximum distance a signal can travel and still be interpreted accurately is equal to a segment's ______________.
Term
 Connectors
Definition
 Are the pieces of hardware that connect the wire to the network device.
Term
 Coaxial cable
Definition
 Cable consists of a central metal core (often copper) surrounded by an insulator, a braided metal shielding, called braiding or shield, and an outer cover, called the sheath or jacket.
Term
 Twisted pair
Definition
 cable consists of color coded pairs of insulated copper wires, each with diameter of 0.4 to 0.8mm (approximately the diameter of a straight pin). Every two wires are twisted around each other to form pairs, and all the pairs are encased in a plastic sheath.
Term
 Crosstalk
Definition
 The more twists per foot in a pair of wires, the more resistant the pair will be to ________________
Term
 UTP (untwisted shielded pair)
Definition
 Cabling consists of one or more insulated wire pairs encased in a plastic sheath.
Term
 Cat5
Definition
 Modern LANs use ____ or higher wiring.
Term
 Fiber-Optic
Definition
 Cable contains one or several glass or plastic fibers at its center, or core. Surrounding the fibers is a layer o glass or plastic called cladding. Outside the cladding, a plastic buffer protects the cladding and core. Strands of Kevlar covered with a plastic sheath surrounding the plastic buffer.
Term
 Single
Definition
 Serial refers to a style of data transmission in which the pulses that represent bits follow one another along a _______ line
Term
 EIA/TIA RS-232 (recommended standard 232)
Definition
 describes a popular serial data transmission method.
Term
 DB-25
Definition
 The _______ connector is used in RS-232 transmissions.
Term
 Rollover
Definition
 In a ______ cable, the usual wire positions are exactly reversed in one of the two RJ-45 terminations.
Term
 cable plant
Definition
 The term ________ describes the hardware that makes up the enterprise-wide cabling system.
Term
 TIA/EIA Commercial Building Wiring Standard
Definition
 is also known as structured cabling.
Term
 Cross-connect facilities
Definition
 The points where circuits interconnect with the other circuits is known as ________
Term
 Telecommunications Closet
Definition
 The term _______________ identifies a room containing connectivity for groups of workstations in its area.
Term
 Horizontal Wiring
Definition
 Describes wiring that connects workstations to the telecommunications closet.
Term
 Installation
Definition
 Many network problems can be traced to poor cable _________ techniques.
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