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81 Cards in this Set
- Front
- Back
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what are computer communications?
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process in which two or more computers or devices transfer data, instructions and info
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examples of communication technology
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internet, web email, instant messaging, chat rooms, newsgroup
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what are wilreless internet access points and cybercafes
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wireless internet access point allows wireless connections to internet in public place (3G Network)
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what is a network?
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collection of computers and devices connected via communications devices and transmission media
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what is a local area network (LAN)?
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network in limited geographical area such as home or office building
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what is a metropolitan area network (MAN)?
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connects LAN in city or town
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what is a wide area network (WAN)?
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network that covers large geographical area usnig many types of media
(Internet is world's largest WAN) |
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What is a client/server network?
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one or more computers act as server and other computers, or clients, access server
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what is a peer-to-peer network?
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simple network that connects fewer than 10 computers
each computer, or peer, has equal capabilities |
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What is Internet peer-to-peer (P2P)?
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Sometimes called a file sharing network
enables users to connect to each others hard disks and exchange files directlly |
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what is a bus network?
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all computers and devices connect to central cable or bus
ex. of network topology (layout of devices in network) (pop. topologies are bus, ring and star) |
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Network topology is?
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how computers are physcially tied together in a network, bus, ring or star
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What is a ring Network?
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cable forms closed ring, or loop, with all computers and devices arranged along ring
data travels from device to device around entire ring, in one direction |
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what is a star network?
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all devices connect to a central device (hub or switch)
all data trasferred from one computer to another passes through ub or switch |
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What are Ethernet?
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oldest technology - no collisoin control
-technology allows computers to contend for access to network |
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what is token ring
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technology controls access to network by requiring devices to pass a special signal, called tocken
-allows only one computer to print at a time on a network=collision control |
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what are TCP/IP and 802.11 (Wi-Fi)?
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Transmission Control Protocol/Internet Protocol- technology trasmits data by breaking it up into small pieces
-TCP/IP controls the internet |
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802.11 (Wi-Fi)
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is family of standards for wireless LANs
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what is bluetooth
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short-range radio waves transmit data between Bluetooth devices
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What are UWB
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ultra wide band
=specification allows data to be transfered wirelessly via short range radio waves -very high speed wireless |
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what is IrDA
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specification allows data to be transferred wirelessly via infrared light waves
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what is WiMAX or 802.12
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world wide interoperablitly for Microwave Access - standard that specifies how wireless devices communicate over the air in a wide area
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What is RFID
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radio frequency identification- uses raido signals to communicate with a tag placed in an object
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what is WAP?
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wireless application protocol=allow wireless mobile devices to access internet
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what is the public switched telephone network (PSTN)
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worldwide telephone system that handles voice-oriented telephone calls
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what is a dedicated line
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always -on connection between two communication devices
-five types are ISDN line, DSL, FITH, and FTTB, T-carrier line and ATM |
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what is bandwith
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the amount of data or messages that can be sent through a communication device at the same time
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what is a cable modem?
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sends and recieves data over cable television network
-much faster than dial-up modem or ISDN -Sometimes called a broadband modem |
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What is a wireless modem?
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allows access to the Web wirelessly from a notebook computer, PDA, a smart phone, or toher mobile device
uses the same waves used by cellular telephones |
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What is a network card?
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adapter card, PC card, expresscard module, USB network adapter or flash card that enables computer or device to access network
-sometimes called network interface card (NIC) |
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what is a router?
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connects computers and transmits data to correct destination on network
-Routers forward data on Internet using fastest available path -some routers have a built-in hardware firewall |
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What is a home network?
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multiple computers connected in home
ex. ethernet , powerline cable, phoneline |
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What is a communication channel?
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transmission media on which data travels in communications systems
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Transmission Media
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materials capable of carrying one or more signals
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Bandwidth
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is amount of data that can travel over a communication channel
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transmission media is
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the channel that actually carries the information
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what is physical transmission media
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wire, cable, other tangible materials used to send communication signals
1-witested pair 2- coaxial cable 3- fiber-optic |
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what are twisted pair cable
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used for telephone systems and network cabling
-eliminates electromagnetic interference |
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what are coaxile cable
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often used for cable television wiring
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what is fiber optic cable
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capable of carrying significantly more data at faster speeds than wire cables
-less susceptible to interference and more secure -smaller size |
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what is wireless transmission media?
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used when inconvenient, impractical, or impossible to install cables
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what are broadcast radio
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distributes radio signals over long and short distances
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what are cellular radio
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form of broadcast radio used for mobile comm.
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what is microwave station
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earth-based reflective dish used for microwave comm.
-must transmit in straight line with no obstruction |
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What are Ethernet?
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oldest technology - no collisoin control
-technology allows computers to contend for access to network |
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what is token ring
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technology controls access to network by requiring devices to pass a special signal, called tocken
-allows only one computer to print at a time on a network=collision control |
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what are TCP/IP and 802.11 (Wi-Fi)?
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Transmission Control Protocol/Internet Protocol- technology trasmits data by breaking it up into small pieces
-TCP/IP controls the internet |
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802.11 (Wi-Fi)
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is family of standards for wireless LANs
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what is bluetooth
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short-range radio waves transmit data between Bluetooth devices
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What are UWB
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ultra wide band
=specification allows data to be transfered wirelessly via short range radio waves -very high speed wireless |
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what is IrDA
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specification allows data to be transferred wirelessly via infrared light waves
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what is WiMAX or 802.12
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world wide interoperablitly for Microwave Access - standard that specifies how wireless devices communicate over the air in a wide area
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What is RFID
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radio frequency identification- uses raido signals to communicate with a tag placed in an object
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what is WAP?
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wireless application protocol=allow wireless mobile devices to access internet
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what is a user interface
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controls how you enter data and instructions and how info displays on screen
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what is graphical user inerface (GUI)
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user interacts with menus and visual images such as buttons and other graphical objects
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what is single user/multitasking
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working on two or more programs that reside in memory at same time
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what is booting
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process of starting or restarting a comput
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cold boot
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turing on comput that has been powered off
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warm boot
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restarting a compt that is powered on
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what is a boot disk
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contains system files that will start comput when comput cannont boot also called recovery disk
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what are other program management features of operating systems?
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mulitprocessing, multiuser, fault-tolorant comput
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what is memory management
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optimizing use of random access memory (RAM)
-with virtual memory (VM) portion of hard disk is allocated to function as RAM |
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what is device driver
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program that tells OS how to comm. with device (also called driver)
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what is a network operating system
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allows users to share resources on a network
-adminsisters security by establishing user name and password for each user |
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what is utility program
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system software that performs maintenance-type tasks (also called utility)
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what is file manager
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performs functions related to file management
-image viewer displays, copies, and prints content sof graphic files -ex. windows explorer |
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what is a personal firewall
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detects and protects a personal comput from unauthorized intrusions
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what is a disk scanner
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searches for and removes unnecessary files
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what is a disk defragmenter
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reorganizes files and unused space on hard disk so programs run faster
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what is a diagnostic utility
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compiles technical info about hardware and some software
-prepares report outlining problems |
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what is backup utility
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copies selected files or entire hard disk onto another storage medium
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what are three categories of operating systems
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embedded, network , stand-alone
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what is UNIX
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used by poer users bc of its flexiblity and power
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what is Linux
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popular, free, multitasking, UNIX-type operating system
-open-source software code is avilable to public (red hat) |
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what are ex of network operating systems
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Netware=disgned for clent/server network
Windows Server 2003 Solaris=version of UNIX UNIX/Linux = multi-purpose OS |
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What is an embedded OS
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found on most PDAs and small devices
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What are three operating systems for PDAs
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windows Mobile for pocket PC
Palm OS for palm Blackberry |
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what is embedded linux
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scaled-down Linux operatin system designed for PDAs smart phones smart watches, set-top boxes, internet telephones
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what is symbian OS
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open-source multitasking OS designed for smart phone
make telephone calls, save appointments, browns, |
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what is a virus
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potentially damaging comput program affects comput with out user knowing
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