CIS Chapter 7
Terms
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- connectivity
- concept related to using computer networks to link people and resources
- bluetooth
- 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
- microwave
- uses high frequency radio waves
- line-of-sight communication
- radio waves waves travel in a straight line
- satellite
- sends data long distances using rotating satellites above earth
- modems
- 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
- bandwidth
- a measure of a communication channel's capacity
- types of broadband
- voiceband, medium band, broadband
- protocols
- rules for exchanging data
- TCP/IP
- 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
- packets
- part of a message that are sent separately over the internet
- node
- any device connected to a network
- client
- node requesting resources
- server
- node prodiving resources
- NOS
- 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
- topology
- 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
- strategy
- 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
- LANs
- 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