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LSU Computer
Terms in this set (87)
Communications
describes a process in which two or more computers or devices transfer data, instructions, and information (sending device > communications channel > receiving device)
Blogs, Chat rooms, e-mail, fax, FTP, instant messaging, internet, newsgroups, RSS, video conferencing, VoIP, Web, Web 2.0, Web folders, Wikis
Uses of computer communications:
wireless messaging services
Users can send and receive wireless messages using ____________
Text messaging (SMS)
allows users to send and receive short text messages on a phone or other mobile device or computer
Picture messaging
allows users to send pictures and sound files
Video messaging
allows users to send short video clips
real-time messages
Wireless instant messaging allows wireless users to exchange ________ with one or more other users
Wireless Internet Access Points
allow people to connect wirelessly to the internet from home, work, school, and many public locations
Cybercafe
a coffeehouse, restaurant, or other location that provides personal computers with internet access to its customers
global positioning system (GPS)
a navigation system that consists of one or more earth-based receivers that accept and analyze signals sent by satellites in order to determine the GPS receiver's geographic location
built into many mobile devices, available as a handheld device, and available with new vehicles
GPS receivers are:
Groupware
Helps groups of people work together on projects and share information over a network. Component of workgroup computing. Major feature is group scheduling.
Voice mail
Allows someone to leave a voice message for one or more people. Computer in voice mail system converts an analog voice message into digital form. A voice mailbox is a storage location on a hard disk in the voice mail system.
Collaborate
Many programs provide a means to _____, or work online, with other users to a server.
Collaboration Software
includes tools that enable users to share documents via online meetings and communicate with other connected users (Online meetings, web conferences, document management systems)
Web services
enable programmers to create applications that communicate with other remote computers over the internet or on an internal business network
Mashup
a web application that combines services from two or more sources
Network
a collection of computers and devices connected together via communications devices and transmission media
facilitating communications, sharing hardware, sharing data and information, sharing software, and transferring funds
Advantages of a network include:
Local area network (LAN)
a network that connects computers and devices in a limited geographical area
Metropolitan Area Network (MAN)
connects LAN's in a metropolitan area
Wide area network (WAN)
a network that covers a large geographical area
network architecture
The design of computers, devices, and media on a network is sometimes called the ________
P2P
describes an internet network on which users access each other's hard disks and exchange files directly over the internet
Network topology
refers to the layout of the computers and devices in a communications network
Intranet
an internal network that uses internet technologies
extranet
allows customers or suppliers to access part of its intranet
Ethernet
a network standard that specifies no computer controls when data can be transmitted
token ring
standard specifies that computers and devices on the network share or pass a special signal (token)
TCP/IP
a network standard that defines how messages are routed from one end of a network to another
Wi-Fi
identifies any network based on the 802.11 standard that facilitates wireless communication. Sometimes referred to as wireless Ethernet
Bluetooth
defines how two bluetooth devices use short-range radio waves to transmit data
UWB (ultra-wideband)
specifies how two UWB devices use short-range radio waves to communicate at high speeds
IrDA
transmits data wirelessly via infrared (IR) light waves
RFID
uses radio signals to communicate with a tag placed in or attached to an object, animal, or person
WiMAX (802.16)
developed by IEEE, towers can cover a 30-mile radius, two types are fixed wireless and mobile wireless, provides wireless broadband internet access
Wireless Application Protocol (WAP)
Specifies how some mobile devices can display the content of internet services (web, e-mail, chat rooms), uses a client/server network.
Communications software
consists of programs that: help users establish a connection to another computer or network. Manage transmission of data, instructions, and information. Provide an interface for users to communicate with one another.
Public switched telephone network (PSTN)
the worldwide telephone system
dial-up lines, dedicated line, ISDN line, DSL, FTTP, T-carrier line, ATM
Communications over the telephone network:
ADSL
connections transmit data downstream at a much faster rate than upstream
communications device
any type of hardware capable of transmitting data, instructions, and information between a sending device and a receiving device.
dial-up modem
converts signals between analog and digital
digital modem
sends and receives data and information to and from a digital line (DSL modem and cable modem)
wireless modem
uses the cell phone network to connect to the internet wirelessly from a notebook computer, a smart pone, or other mobile device
network card
enables a computer or device to access a network. available in a variety of styles. wireless network cards often have an antenna
wireless access point
a central communications device that allows computers and devices to transfer data wirelessly among themselves or to a wired network
router
connects multiple computers or other routers together and transmits data to its correct destination on a network. many are protected by a hardware firewall
hub or switch
connects several devices in a network together
home networks
provide computers with the following capabilities: connect to the internet at the same time, share a single high-speed internet connection, access files and programs on other computers, share peripherals, play multiplayer games, connect game consoles to the internet, and subscribe to and use VoIP
ethernet, powerline cable, and phoneline
Types of wired home networks:
bandwidth
The amount of data that can travel over a communications channel sometimes is called the ______
latency
the time it takes a signal to travel from one location to another on a network
transmission media
carries one or more signals
broadband
media transmit multiple signals simultaneously
Cellular radio
a form of broadcast radio that is used widely for mobile communications
microwaves
are radio waves that provide a high-speed signal transmission
communications satellite
a space station that receives microwave signals from an earth-based station, amplifies it, and broadcasts the signal over a wide area
True
A communications channel is a media on which data, instructions, or information travel.
False
With video messaging, users can send short video clips, usually about 15 minutes, in addition to all picture messaging services
True
A network is a collection of computers and devices connected together via communication devices and transmission media
False
A local area network (LAN) is a network that covers a large geographic area using a communications channel that combines many types of media such as telephone lines, cables, and radio waves.
True
A Web server is a computer the delivers requested Web pages to your computer
True
An intranet is an internal network that uses Internet technologies
False
The 40-gigabit Ethernet standard is the fastest of the Ethernet standards
True
Bluetooth does not require line-of-sight transmission
False
At distances of 10 meters (about 33 feet), the data transfer rate for UWB devices is 480 Mbps.
True
Fiber to the Premises (FTTP) uses fiber-optic cable to provide extremely high-speed Internet access to a user's physical permanent location
True
Latency is the time it takes a signal to travel from one location to another on a network
Visual Voice Mail
With _____, user can view message details such as the length of calls and, in some cases, read message contents instead of listening to them
a Web Conference
When an online meeting takes place on the Web, it is called ______
provides for storage and management of a company's documents
A document management system _______
Mashup
A _____ is a Web application that combines services from two or more sources, creating a new application
Hubs and Switches
___ are devices that provide a common central connection point for nodes on the network
RFID
____ is a standard, specifically a protocol, that defines how a network uses radio signals to communicate with a tag placed in or attached to an object, an animal, or a person
Coaxial Cable
____ consists of a single copper wire surrounded by at least three layers.
Mobile TV
____ is a service that provides television programs over the cellular network
Dial-up Modem
communications device that can convert digital signals to analog signals and analog signals to digital signals, so that data can travel along an analog telephone line
Bandwidth
amount of data, instructions, and information that can travel over a communications channel
Transmission Media
materials or substances capable of carrying one or more signals
IrDA
Specification to transmit data wirelessly among computers and devices via infrared light waves
Picture Messaging
allows user to send pictures and sound files as well as short text messages, to a phone or other mobile device, or computer
Digital Modem
Service that carries voice, data, videos, and multimedia at very high speeds
ATM
Communications device that sends and receives data and information to and from a digital line
extranet
allows customers or suppliers to access part of a company's intranet
noise
electrical disturbance that can degrade communications
groupware
Software that helps groups of people share information over a network
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