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90 Cards in this Set
- Front
- Back
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802.11 standard |
802.11 standard An IEEE standard that specifies an over-the-air interface between a wireless client and a base station or between two wireless clients. |
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amplitude |
amplitude The crest or trough of a wave from the midpoint of the waveform to its top or bottom |
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analog signal |
analog signal a signal that carries information as continuous waves of electromagnetic or optical energy. |
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anycast transmission |
anycast transmission a transmission method in which data is sent from a server to the nearest node within a group, which then initiates another anycast and transmits the data to next nearest node within the group, and so forth, until all nodes in the group have received the data |
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AP (Access Point) |
AP access point See WAP |
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asynchronous communications |
asynchronous communications
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backoff |
backoff the random amount of time a node in a CSMA/CD network waits after a collision has occurred; a typical backoff period is a few milliseconds long. |
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baseband transmssion |
baseband transmission a transmission technique in which digital signals are sent via direct current pulses over a single, unmultiplexed signal channel |
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bluetooth |
bluetooth a wireless technology that facilitates short-range wireless communication between devices, such as personal computers, laptops, mobile phones, and gaming consoles, thus creating a WPAN |
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broadband transmission |
broadband transmission a transmission technique in which a single medium carries multiple channels of data, usually through modulation. |
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broadcast transmission |
broadcast transmission a transmission method in which data is sent from a source node to all other nodes on a network |
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CAN (campus area network) |
CAN(campus area network) a network that covers an area equivalent to an academic campus or business park |
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centralized network |
centralized network a network in which a central mainframe computer controls all network communication and performs data processing and storage on behalf of clients |
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client |
client a network device or process that initiates a connection to server |
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client/server network |
client/server network a network in which servers provide resources to clients |
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competitive media access |
competitive media access see contention-based media access |
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contention-based media access |
contention-based media access a media access method in which nodes compete or cooperate among themselves for media access time. Also called competitive media access |
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controlled media access |
controlled media access a media access method in which a central device controls when and for how long each node can transmit. Also called deterministic media access. |
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CSMA/CA (Carrier Sense Multiple Access/Collision Avoidance) |
CSMA/CA (Carrier Sense Multiple Access/Collision Avoidance) a contention-based media access method where nodes try to avoid data collisions by transmitting when they deem the channel to be idle. |
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CSMA/CD (Carrier Sense Multiple Access/Collision Detection) |
CSMA/CD (Carrier Sense Multiple Access/Collision Detection) A contention-based media access method where nodes send data when they deem the channel to be idle, but take steps to retransmit when collisions occur. |
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cycle |
cycle one complete oscillation of an analog signal |
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data transmission |
data transmission the exchange of data among different computers or other electronic devices through a network |
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DC (direct current) |
DC(direct current) A type of electric current that flows unidirectionally |
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de-encapsulation |
de-encapsulation The process of removing delivery information at each layer of the OSI model as data passes to the next-higher layer at the receiver end. |
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demand priority |
demand priority a polling technique in which nodes signal their state-either ready to transmit or idle-to an intelligent hub, which grants nodes permission to transmit |
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demultiplexer |
demultiplexer see demux |
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demultiplexing |
demultiplexing a process that converts the multiplexed signals to independent signals |
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demux (demultiplexer) |
demux (demultiplexer) a device that performs demultiplexing at the receiving end |
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deterministic media access |
deterministic media access see controlled media access |
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enterprise network |
enterprise network a network that includes elements of both LANS and WANS and is owned and operated by a single organization to interlink its devices and resources |
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extranet |
extranet A private network that grants controlled access to users outside of the network |
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FDM (frequency-division multiplexing) |
FDM (frequency-division multiplexing) a multiplexing method in which data from multiple nodes is sent over multiple frequencies or channels over a network medium. |
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frequency |
frequency The number of complete cycles per second in a wave. Also called the period of the wave. |
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full duplex |
full duplex a communication mode that permits simultaneous two-way communication |
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half duplex |
half duplex a communication mode that permits a two-way transmission, but in only one direction at a time. |
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hertz |
hertz a measure of the number of cycles per second in an analog signal. One cycle per second equals one hertz |
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hub |
hub a networking device used to connect the drops in a physical star topology network into a logical bus topology. Also called a multiport repeater |
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ICS (industrial control system) |
ICS (industrial control system) a network or system used to support municipal services, industrial processes, and transportation systems |
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in phase |
in phase when two waves of the same frequency begin at the same time. |
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internet |
internet the single largest global WAN that virtually links every country in the world |
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intranet |
intranet a private network that uses internet protocols and services to share a company's information with its employees |
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IP(internet Protocol) |
IP(internet Protocol) A connectionless Network-layer protocol that is responsible for sending data packets across a network |
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IP address |
IP address a unique identifier assigned to every node connected to a TCP/IP network, such as the Internet |
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LAN(local area network) |
LAN(local area network) a self-contained network that spans a small area, such as a signle building, floor, or room |
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MAN (metropolitan area network) |
MAN (metropolitan area network) a network that covers an area equivalent to a city or a municipality |
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manchester encoding |
manchester encoding a digital transmission encoding scheme using binary that represents the transition from positive to ground with a 0, and the transition from negative to positive in the middle of the bit period with a 1 |
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media access method |
media access method a network communications mechanism that determines whether or not a particular node can transmit data on a network at a given time |
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medianet |
medianet a network optimized for rich media, such as voice and video, which is designed to transport a mixture of rich media and other content, such as text |
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mixed mode network |
mixed mode network a network that incorporates elements from more than one of the three standard network configurations |
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modem |
modem a device that enables digital data to be sent over an analog medium, such as a telephone wire or cable provider's line |
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multiplexer |
multiplexer see MUX |
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multiplexing |
a controlled media access method in which a central device called a multiplexer combines signals from multiple nodes and transmits the combined signal across a medium |
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multipoint connections |
multipoint connections connections between many nodes |
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mux (multiplexer) |
mux (multiplexer) a device that manages multiplexing from the sending end |
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network |
network a group of devices that are connected together to communicate and share network resources |
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network backbone |
network backbone the highest-speed transmission path that carries the majority of network data |
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network baseline |
network baseline a baseline that documents the network's current performance level and provides a quantitative basis for identifying or unacceptable performance |
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network configuration |
network configuration a design specification for how the nodes on a network are constructed to interact and communicate |
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node |
node any device that can connect to the network and generate, process, or transfer data |
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noise |
noise in electronics, random changes and disturbances in an electrical signal, such as EMI or RFI |
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OHM |
OHM the value of electrical resistance through which one volt will maintain a current of one ampere |
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on-off keying |
on-off keying a digital data transmission encoding scheme in which a change in voltage from one state to another within a predetermined interval is symbolized by a 1 |
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out of phase |
out of phase when two waves either start at an offset from each other or have different frequencies |
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PAN (personal area network) |
a network that connects two to three devices with cables and is most often seen in small or home offices |
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parallel data transmission |
parallel data transmission a transmission technique in which multiple bits are transmitted across multiple transmission lines |
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PDU(protocol data unit) |
PDU(protocol data unit) an umbrella term that refers to the data packets, frames, packets, segments and datagrams that carry information across a network |
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phrase |
phrase the fixed point where a wave's cycle begins in relationship to a fixed point |
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point-to-point connection |
point-to-point connection a direct connection between two nodes on a network |
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polling |
polling a controlled media access method in which a central device contacts each node to check whether it has data to transmit |
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protocols |
protocols rules that govern the transfer of information among computing devices |
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redistribution point |
redistribution point a network node that is used to transfer data |
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scada system (supervisory control and data acquisition system) |
scada system (supervisory control and data acquisition system) an ics that is used in situations where sites are at great geographical distances from one another, and where centralized data collection and management is critical to industrial operations. |
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segment |
segment a physical subdivision of a network that links multiple devices or serves as a connection between two nodes |
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server |
server a network device or process that shares resources with and responds to requests from computers, devices and other servers on the network |
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signal |
signal the electromagnetic pulses that are transmitted across a network medium |
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signal bounce |
signal bounce a condition in which the signals endlessly move from one end of a cable to the other end |
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smtp(simple mail transfer protocol) |
smtp(simple mail transfer protocol) a communications protocol that enables sending email from a client to a server or between servers |
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switch |
switch a network device that acts as a common connecting point for various nodes or segments |
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synchronous communications |
synchronous communications a communication method in which a byte is sent in a standardized time interval, enabling the receiver to use the time interval as the means to distinguish between bytes in the data stream |
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tdm(Time-division multiplexing) |
tdm(Time-division multiplexing) a multiplexing method in which the communication channel is divided into discrete time slots that are assigned to each node on a network |
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thin client |
thin client a device or process that depends on a server to fulfill its computational needs |
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threat |
threat any potential violation of security policies or procedures |
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token |
token a physical or virtual object that stores authentication information |
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top |
top a CPU usage monitoring tool offered in unix and linux systems that provides a static snapshot or a real-time display of the processes currently running on a cpu |
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twisted pair |
twisted pair a type of cable in which two conductors or pairs of copper wires are twisted around each other and clad in a color-coded, protective insulating plastic sheath or jacket |
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unicast transmission |
unicast transmission a method for data transfer from a source address to a destination address |
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virus |
virus a sample of code that spreads from one device to another by attaching itself to other files |
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waveform |
waveform the graphical representation of a signal |
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workgroup |
workgroup see peer-to-peer network |
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worm |
worm code that spreads from one device to another on its own, not by attaching itself to another file |
