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41 Cards in this Set

  • Front
  • Back
concept related to using computer networks to link people and resources
allows wireless communication for nearby devices
communication systems
electronic systems that transmit data from one location to another
communication channels
carry data from one computer to another, physically or wireless
physical connections
use a solid medium such as twistedpair telephone lines, coaxial cable, and fiber-optic cable
telephone lines - twisted pair
cable of copper wires, being replaced by other media
coaxial cable
replaces twisted pair with a solid-copper core to provide higher transmission capacity
fiber-optic cable
transmits data as pulses of light. lighter and faster than coaxial cable
uses high frequency radio waves
line-of-sight communication
radio waves waves travel in a straight line
sends data long distances using rotating satellites above earth
convert ditial signals to analog signals and convert analog to digital
external modem
outside the system cabinet connected by cable to the serial port
internal modem
card that plugs into a slot on the system board
PC Card modem
a credit card-size expansion board for portable computers
wireless modem
receives data through the air
a measure of a communication channel's capacity
types of broadband
voiceband, medium band, broadband
rules for exchanging data
standard protocol for the internet with two essential features: IP address, packets
IP addresses
identify the computer on the internet, DNS converts text-based addresses to IP addresses
part of a message that are sent separately over the internet
any device connected to a network
node requesting resources
node prodiving resources
network operating system
distributing process
system where processing is located and shared at different locations
host computer
large centralized computer
network architecture
describes how a computer network is configured
ways computers are arranged
star network
each drive is linked to a central unit, control is maintained by polling, often used for time-sharing systems in which several users share resources of a central computer
bus network
ethernet, each device handles its own communications along a common connecting cable called a bus
ring network
each device is connected to two other devices forming a ring
hierarchial network
connects smaller computers to a central host, often used in distributed data processing systems
way of sharing information and resources
terminal network system
a centralized computer distributes power to several terminals
peer-to-peer network system
each computer acts as both a sever and a client
client/sever network system
client computers request resources forma server computer
connect devices that are located close to one another
metropolitan area networks
used to link office buildings within a city
wide area networks, WANs
largest type, span states and countries