Term
| What is digital convergence? |
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Definition
| gradual merger of computing and communications into a new information environment in which the same info is exchanged among many kinds of equipment using computer language. |
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Term
| what is the different between analog and digital data? |
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Definition
Analog signals use wave variations (sound, light, temperature.
Digital signals are used by computers, a series of 0's and 1's. |
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Term
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Definition
| short for modulate/demodulate. they convert a computer's digital data, transmits it, then reconverts it back to digital data for the receiving computer. |
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Term
| What is digital sampling? |
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Definition
| Converting reality to digital form: digital recording devices take samples of the sound wave at very fast regular intervals which are played back to fast that they sound continuous. |
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Term
| What is a network? What are its advantages/disadvantages? |
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Definition
| a system of interconnected computers/other devices that communicate. benefits: share programs and data, better communications, security of info. access to shared databases. Disadvantages: expense, security issues, rapid speard of virsus, dependency on mail file server |
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Term
| What are the 5 types of networks? |
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Definition
| WAN (Wide area network), MAN (metropolitan area net.) LAN (Local area net., HAN (home area/automation net.) PAN (personal area net.) |
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Term
| What is a client/server network structure? |
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Definition
| consists of clients (computers that request data) and servers (computers that supply data) |
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Term
| What is the peer-to-peer network structure? |
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Definition
| all computers on the network are "equal" and communicate directly with one another without relying on servers. |
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Term
| Name the wired connections. |
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Definition
| twisted pair, coaxial cable, fiber-optic cables, ethernet |
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Term
| Name the wireless connections. |
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Definition
| infrared, radio, communications stellites, GPS, Bluetooth, WiFi, 3/4 G |
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Term
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Definition
| fixed length blocks of data for transmission, reassembled after transmission |
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Term
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Definition
| set of conventions, rules, governing the exchange of data between hardward/ software components in the network |
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Term
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Definition
| used for regular phone communications |
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Term
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Definition
| for high speed audio and video, wide band frequencies. (faster than narrowband) |
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Term
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Definition
| protocol for getting wired devices connected to internet. |
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Term
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Definition
| wireless application protocol. wireless devices use this to connect to internet. |
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Term
| What are the 5 types of wireless communications media? |
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Definition
| infrered transmission, broadcast radio, cellular radio, microwave radio, communication satellites. |
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Term
| What is the history of the internet? |
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Definition
| began in 1969 for dept. of defense. some other stuff happened. 2010: 2 billion people use it |
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Term
| What do you need to connect to the internet? |
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Definition
| access device (computer with modem), means of connection (phone line, cable, wireless) and internet access provider. |
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Term
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Definition
| how much data can be sent through a communications channel in a given amount of time |
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Term
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Definition
| uses regular phone lines- need to be no more than 3 miles from phone company switching office. |
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Term
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Definition
| traditional trunk line. very expensive |
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Term
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Definition
| tv cable system with internet connecion |
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Term
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Definition
| transmits data between satellite dish and satellite orbiting earth. |
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Term
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Definition
| wireless fidelity. has 4 generations. |
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Term
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Definition
| Internet service provider. ex. Earthlink, Comcast |
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Term
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Definition
| Wireless internet service provider. ex. AT&T, Cingular, Verizon. |
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Term
| How does the internet work? |
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Definition
| hundreds of thousands of smaller networks. has Point of presence (collection of modems), local gateway to an ISP's network. ISP connects to an IXP. |
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Term
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Definition
| routing computer at a point on the internet where several connections come together. run by private companies. |
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Term
| What is the internet backbone? |
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Definition
| high speed, high capacity data transmission lines, usually fiberoptic. uses newest technology |
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Term
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Definition
| Cooperative university/business education and research project. adds "toll lanes" to older internet to speed things up.advances videoconferencing, research, collaberation |
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Term
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Definition
| uniquely indentifies any device connected to internet. four sets of numbers between 0-255 seperated by periods . |
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Term
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Definition
| software for web surfing (internet explorer, firefox.) |
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Term
| What is a Uniform Resouce locator? |
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Definition
URL: character string that points to a specific piece of info anywhere on the web. consists of:
web protocol: http://
domain name of web server
directory name/folder
file within directory, extension |
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Term
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Definition
| protocol used to access world wide web. |
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Term
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Definition
| hypertext markup language- set of instructions used to specify document structure, formatting, and links to other documents on the web. |
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Term
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Definition
| file transfer protocol- software standard for transferring large files between computers, including those with different operating systems. |
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Term
| What is internet telephony? |
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Definition
| uses the internet to make phone calls via VoIP (voice internet protocol) |
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