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52 Cards in this Set
- Front
- Back
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data communications
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transmission of data
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telecommunications
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transmission of any information
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digital information
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sequence of symbols
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analog information
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continuous signal
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bit rate
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speed of xmission
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bandwidth
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total amount one can xmit
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throughput
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what's actually xmitted
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synchronous
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two parties sync themselves somehow
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asynchronous
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two parties don't need syncing
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isochronous
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receive data at same rate it was sent
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simplex
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transmit in one direction only
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half duplex
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xmit in one direction at a time, either way
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full duplex
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xmit different ways simultaneously
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multiplexing
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many inputs to 1 output
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demultiplexing
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one input to many output
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centralized processing
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one machine does bulk of work
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distributed processing
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different servers do the work
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client/server computer
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request/response
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p2p
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no dedicated server, request response
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three tiered architecture
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application logic, business logic, database logic
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remote procedure call
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a function call from another system
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message system
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network:node:process
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unicast
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1 to 1 xmission
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multicast
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1 to many xmission
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broadcast
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1 to all xmission
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netBEUI
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small networks, unrouted, windows. within local network
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ipx/spx
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novell networks, routed, discontinues
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tcp/ip
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large networks, routed
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thin client
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stripped down pc
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thick client
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full pc
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digital subscriber lines
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asymmetric, like 1way cable. uses FDM frequence division multiplexing
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active optical networks AONS
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5 homes share 1 connection
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passive optical networks PONS
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optical network terminator like cable network.
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coaxial cable
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little signal loss/distortion, easy to tap into
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baseband
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one signal, digital
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broadband
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many channels, analog
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fiber optic cable
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light to xmit data, more secure, more expensive
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radio waves
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AM and FM frequencies, short wave and CB. omnidirectional, travel long distance, low bandwidth
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terrestrial microwave
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parabolic antennas, travel in straight line, shortage of spectrum
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satellites
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low altitude or low earth orbiting satellites
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hubs
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nw device - provides communication, increasess distance, graceful degradation. collision domain extended, node limitation
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bridges
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outdated nw dev
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routers
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nw device, isolate traffic, more intelligent, not plug and play, longer per-message processing
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switches
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nw device, forwards/filters, has MAC address table
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circuit switching
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method of switching. reserved resources, multiplexing, FDM, TDM
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FDM frequency
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bandwidth split by frequency
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TDM
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bandwidth split by timespans
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packet switchign
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method of switching, unreserved resources, store and foreward, queueing delays, packet loss,
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virtual circuit network
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routes packets according to virtual circuit numbers
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datagram network
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routes packets according to host destination addresses
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D=L/R
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transmission delay
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D=d/s
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propagation delay
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