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Chapter 5: Internet and Communications Technology
Terms in this set (57)
What two types of networks are there commonly used to transfer data from one point to another?
Private and public networks
What is data communication?
Data communication is the transfer of information from one computer to another
How does one computer transfer information to another computer?
The sender (or transmitter) sends data to the receiver over a communication channel (or a communication link)
What are two forms the communication link may be in?
Wired or wireless
What is the receiving computer often determined as?
It is often determined as "remotely located"
What are two common terms used in data communications to describe the action of transferring data?
Upload and download
What is uploading?
Transferring a file from one computer to another on a network using data communication links
What is downloading?
Transferring a copy of a file from a distant computer to a disk in one's local computer using data communication links
What is a network?
A communications system created by linking two or more computers, using established protocols so that they can work together
When do we have a network?
When computers are connected via communication channels so that users can share hardware resources
What are the three main types of computer networks?
Local area networks (LANs), Metropolitan area networks (MANs), Wide area networks (WANs)
What is a LAN?
A LAN is a computer network that uses cables or radio signals to link two or more computers in a geographically limited area (generally one building or a group of buildings)
What is a MAN?
A MAN is a regional computer or communications network spanning the area covered by an average to large-sized city
What is Wi-MAX?
It is an example of a MAN (Wireless Multiple Area Network)
What is WAN?
A WAN is a data communication network expanding a LAN outside its building over telecommunication lines (or wirelessly), to link the other LAN over great distances
What is an example of WAN?
What are example of hardware devices that connect computers together?
Network cables and cards, hubs, switches and routers
What is the role of a network card?
An electronic device that connects a computer to a computer network, usually a LAN
What is a hub?
A device that connects many cables together and transfers network messages between those cables
What are many homes now equipped with?
Many homes now are equipped with both a modem and wireless router
What is a router?
A router is two different IP networks connected to each other
What are used for linking computers in a network?
Transmission media like cables and radio waves
What type of media are cables referred to?
Cables are referred to as wired media
What are some examples of wired media?
Coaxial, twisted pair and fiber-optix cables
What type of transmission media is referred to as wireless media?
Satellite (mobile data network), microwave (WiFi and bluetooth) and infrared
What is WiFi?
It's a trademark name for popular microwave technology used in data communications
What is a WiFi hotspot?
It is an area covered by a WiFi antenna
Where are WiFi hotspots found?
In airports and Internet cafes (Starbucks)
What is simplex?
A form of data transmission where information can only be transmitted one way (either sent or received, not both)
Example: a pager, microwave transmitter
What is half duplex?
A form of data transmission where information can be sent two ways, but only one at a time
Example: walkie-talkies, fax machine
What is duplex?
A form of data transmission where information can be sent both ways
Example: mobile phones, LAN, WAN, MAN
What is the Internet?
A public global wide area network based on the TCP/IP protocol
What is TCP/IP?
A protocol that assigns every connected computer on a WAN on the Internet, a unique internet address (also known as an IP address)
What is intranet?
A private computer network designed to meet the needs of a single organization or company that is based on Internet TCP/IP technology. It is not opened to external Internet and not open to outside users
Example: web pages, web browsers
What is extranet?
An intranet that has been selectively opened to strategic allies (customers, suppliers).
Example: online banking
What is bandwidth?
A characteristic of media which determines the speed at which data is carried
What is the speed?
The speed is the measure of the amount of data that can be transmitted via the communications channel in a given unit of time
What the speed at which data is carried measured in?
It is measured in bits per second (bps)
What are the terms that have been coined to refer to bandwidth?
narrowband, voiceband and broadband
What does narrowband technology provide?
Narrowband technology provides bandwidth that is less than or equal to that provided by ordinary telephone lines (64 kilobits per second or less)
What does voiceband technology provide?
Voiceband technology provides bandwidth capable of transmitting human spoken communication
What does broadband technology provide?
Broadband technology provides bandwidth that is greater than that provided by ordinary telephone lines (greater than 64 kilobits per second)
What are the two communication modes?
Broadcast and point-to-point
What is the difference between broadcast and point-to-point?
Broadcast means sending out a message to all the other computers on a network (radios and television).
Point-to-point establishes a direct communication channel between two computers on a network (mobile phones)
What protocol is communication in the WWW based on?
It is based on HTTP (Hyper Text Transfer Protocol)
What are a few common protocols and what are their functions?
HTTP (Hyper Text Transfer Protocol) - used to request or transmit files over the Internet or other computer networks
FTP (File Transfer Protocol) - used to transfer files between FTP servers and clients
VoIP (Voice over IP) - used to transmit voice-grade data over the internet (Skype, FaceTime)
Wi-Fi - used to test products to ensure that they comply with particular industry wireless standards
Bluetooth - used to exchange data over short distances from fixed and mobile devices
What is the WWW?
World Wide Web is a huge collection of documents called web pages. These web pages are grouped into web sites stored on web servers, downloaded and displayed on a user's computer by a web browser
What is a web page written in?
A web page is written in HTML (Hyper Text Markup Language
What are web sites and web pages linked to?
They are linked to hyperlinks which allow users to find documents on their web pages easily
What is the main focus of HTML?
It's to convert an item of text into a hyperlink
What do hyperlinks do?
Hyperlinks serve as a navigational scheme that allows users to browse from one web page to another or from one web site to the next (shortcuts to other web pages)
What is E-mail?
Electronic mail allows users to send an electronic message over a network to anyone with an e-mail address and access to a computer system
What is an e-mail message?
Usually text-based but may include images, sounds and video clips as attachments
What is IRC?
Internet Relay Chat is a messaging system that allows users to chat with other people on the internet using text messages
What is a bulletin board?
An electronic forum that hosts posed messages and articles related to a common subject
What is a newsgroup?
An online discussion group or forum specifically focused on particular area of interest
What is blogging?
Blogging refers to maintaining an online diary
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