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Data Communications Computer systems that transmit data over communications lines

Data Communications Computer systems that transmit data over communications lines Components of Data Communications Systems sending device Communications link Receiving device . Network - is a group of computers connected together . Types of Network : LAN(Local Area Network)

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Data Communications Computer systems that transmit data over communications lines

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  1. Data Communications Computer systems that transmit data over communications lines Components of Data Communications Systems sending device Communications link Receiving device

  2. Network • - is a group of computers connected together

  3. Types of Network: • LAN(Local Area Network) - small network that covers a small area, such as an office or school 2. WAN(Wide Area Network) - is a network of geographically distance computers and terminals.

  4. Internet • Is a gigantic computer network that connects computers across the world. World Wide Web • Only one part of the internet. It is a way of accesing the huge collection of information, services and websites available through the internet Website - Specific location on the web that contains a collection of related files and resources by a person, group or organization.

  5. URL (Uniform Resource Locator) • Known as the address of a website Http( Hypertext Transfer Protocol) • Is the protocol, or set of rules, that lets information travel over the web. Four things to connect to the Internet • Computer • ISP ( Internet Service Provider) • Modem • Communications Software e.g. web browser software, email software, and software that allows your computer to another computer

  6. Internet Service Provider - is a company that sells you access to the internet, usually for a monthly fee Modem • Is a device that lets your computer send data to and receive data from other computers or to a network. Types of Modem: 1. Telephone modem – connects your computer to the internet using telephone lines

  7. 2. DSL(Digital Subscriber Line) modem - uses your telephone line to supply a high speed internet connection. 100 times faster than a telephone modem 3. Cable modem - uses your cable television lines to supply a high speed internet connection. Web Browser - is a software program that lets you surf the web and interact with websites. e.g. Microsoft Internet explorer, netscape, apple safari, and mozillafirefox

  8. E-Mail (Electronic mail) • Communication sent from one person to another over the internet. Netiquette - refers to the good manners one uses in electronic communications. Spam - Is like junk mail. It is sent in bulk to many people’s e-mail accounts

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