Computer

A worldwide collection of network that link to

Who manage the Internet - NOBODY
Each organization is responsible own network

Evolution of the Internet

Home and small business

Cable Internet service

Fiber to the Premises FTTP

fixed wireless and others

Acces provider is that individuals and organizations
acces to the internet free or for a fee

Internet ISP

Online OSP

Wireless Internet WISP

IP address

number that uniquely identifies

Domain name

the text version of an IP address

DNS server

the text version of an IP address

Netiquette

Golden Rule

the code of acceptable internet behavior

treat other as you would like them to treat you

Other Internet Services

E-mail

E-mail program

Instant messaging IM

chat

chat room

VoIP Voice over IP

newgroup

messange board

FTP File Transfer Protocol

Component of Data Communication

Message – The data to be communicated, the popular form of information include text number, pictures, audio

Sender - The device that sends the data message, it can be a computer, video camera, workstation telephone

Receiver – The device that receives the message like television

Transmision medium - The physical path by which a message travels from vender to receiver like radio waves

Protocols – The set of rules thatgoverns data communication, represent an agreement

Component of a Computer Network

Hardware component

Servers

Clients

Peers

Transmission media

Connecting devices – router, bridges, hubs, repeater, gateways and swicthes

Software component

Networking operating

Protocol suite – Open System Interconnection OSI model, TCP/IP model

Topology

Is geometic represent of relationship of all the links and finding devices usually called nodes to one another

Types of Topology

Bus Topology
- On the other hand is multipoint

Star Topology
- Each device has a dedicated point-to-point link only to a central control, called a hub

Ring Topology
- Each device has dedicated point connection with only the two device on either side of it

Mesh Topology
- Every device has a dedicated point-to-point link to every other device

Categories in Network

Local Area Network LAN
- Is usually privately owned and link the device in a single affice, building or campus

Wide Area Network WAN
- Provides long-distrance transmission of data, images, audio and video information owner large geographic areas that may comprise a country, a continent or even the whole world

Metropolitan Area Network MAN
- Is a network with a size between a LAN nad a WAN. It normally covers the area inside a town and city

Consists of a worldwide collection of electronic ducuments (web pages)

Web site

collection related web pages and associated items

Web sever

delivers requested web pages

Web 2.0

refers web sites for users to interact

Different between

web 1.0

read only content and static HTML

web 2.0

read write web lthrough blogs or sites like Flicker, Youtube

web 3.0

semantic web, personalization e.g iGoogle, intelligent search

Web Browser

Internet Explorer

Firefox

Opera

Safari

Google Chrome

Home page

Link

related web pages - surfing the web

Downloading

process of receiving information

Has unique address called URL or Web address

Tabbed browsing

Allow to open and view multiple web pages

2 types search tools

search engine

find information related to a specific topic

subject directory

classifies web pages in aan organized set of categories

Multimedia

plug-in

program that extends the capability of a web browser

web publishing

development and maintenance of web pages

E-Commerce

buying and selling productor service

L-Commerce

provide location information

M-Commerce

conduct commerse using a mobile device