Information Technology Study Notes - Copy

7/29/2019 Information Technology Study Notes - Copy

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CARIBBEAN EXAMINATIONS COUNCIL

Caribbean SecondaryEducation Certificate


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A: INTERNET AND COMMUNICATIONS TECHNOLOGY

SPECIFIC OBJECTIVES CONTENT

Students should be able to:

1. use terms associated with datacommunications and networks;

Definitions of data communication and network;types of networks: (local area network, wide area

network, metropolitan area network), types oftransmission media: cable/wired media (coaxial,fibre-optic, twisted pair), wireless media (satellite,microwave, infra-red), wireless networktechnology: (Bluetooth, Wi-F i), hotspot, modem,bandwidth (broadband, narrowband, voiceband),communication modes: (simplex, duplex, halfduplex), point-to-point, and broadcast.

2. distinguish among Internet,intranet and extranet;

Refer to glossary.

3. explain concepts associated withthe Internet;

Including Electronic mail (e-mail), newsgroups,Internet Relay Chat (IRC), Telnet, FileTransfer Protocol (FTP), upload, download,World Wide Web (WWW), web browser, HTTP,Hypertext Markup Language (HTML/XHTML),web page, website, blogging, webserver, URL, e-commerce, e-learning, HTTP, pod-casting,bulletin board, VoIP.

4. describe measures to secure dataand maintain data integrity;

Software Restrictions: passwords, encryption,

virus protection, firewall; physical accessrestrictions: biometric systems, guards, locks;

fire/water proof cabinets; archiving; backup and

recovery procedures; propriety data and software.


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Transmission of data from one location to another for direct use

or for further processing.

Group of network of two or more computers linked together so

that they can share resources, such as:

Hardware

SoftwareData

Local Area (LANs)

Wide Area Network (WANs)

A LAN consist of a connection of microcomputers, such as

computers at

Schools

OfficeThat can share peripherals, programs and files.


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They are connected by cables or wireless link. Each computercan function as an individual personal computer.

The server runs the networking software that allows resources

To be shared with other computers (Called clients) on the

network.

Printers

Hard Drives

Disk Drives

Optical drivers (CD-ROM, DVD-ROM,CD-RW,DVD-RW)

Modems

Fax Machines

Printers can be shared

Storage facilities can be shared


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Software and data files can be shared

Users can work on a single document together

Communicate using mail

Initial setup cost is high Increase risk of data corruption If file sever fail all stations are affectedNetwork can be complicated to maintain

Twisted Pair

This is a convenient and cheap method of connecting computers

and peripherals in a network. It is normally used in homes or

small sites. Where network are closer together so great need for

speed.

Coaxial Cable Expensive than twisted pair because transmission

capabilities are higher. It is used to transmit voice, video

and data. Ideal for a medium size network.


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Fibre Optic

Expensive. Enables large volume of digital data to be

transmitted extremely fast and virtually error free. A single

strand is a hairthin piece of glass tubing. The inside acts as

mirror, allowing pulses of light to travel along it to which carry

How computer are connected determines its topologies are

configurations.

Central Sever

PC PC

PC

PCPC

PC

Documents

Information Technology Study Notes - Copy