MULTIMEDIA AIDED COMPUTER LAB : MULTIMEDIA AIDED COMPUTER LAB DEVANRAJU PERICHERLA INTRODUCTION TO NETWORK TECHNOLOGIES Slide 2: Exercise-9: Basics of web page design,
Writing and designing of W W W.
Exercise-10: HTML Language.
Exercise-11: Designing and Writing for Multimedia.
Exercise-12: E-mail, Mailing list, News groups and Pharmacy related discussion forums.
Exercise-15: Network technologies, Intranets. WE ARE GOING TO LEARN ABOUT : WE ARE GOING TO LEARN ABOUT World Wide Web,
Network Technologies Networking Technologies : Networking Technologies COMMUNICATION : COMMUNICATION Communication is the transfer of information from one place to another.
The process of communication essentially involves the following three components:
Medium Slide 7: Sender :- The component from where the information is transferred
Receiver :- The component to which the information is transferred.
Medium:- The component through which the information is transferred . Slide 8: The communication becoming more popular these days is due to communication between computers.
In computer communication the sender and the receiver are both computers and medium is electromagnetic waves, cables or some other physical media. Slide 10: Networking:-
Networking is a way of communication.
The concept of connecting computers together to form computer network.
A computer network is a communication system where a group of computers and other devices like printer are connected by cables and other hardware.
This concept of connected computers sharing resources called networking. Slide 11: When computers are connected in a network , then they can share:
Other hard disk resources. Advantages of Networking : Advantages of Networking Networks allow efficient management of resources.
Network helps keep information reliable and up-to-date.
Networks help speed up data sharing. Transferring files across a network a network is always faster than non network.
Services like E-mail allow much more communication among individuals. Types of Networks : Types of Networks L A N (Local Area Network)
W A N (Wide Area Network)
M A N (Metropolitan Area Network) L A N : L A N If a network is confined to a single location, typically one building or complex, it is called local area network.
The maximum distance from one end of a network to another is usually limited .
Generally sending and receiving of messages through a physical connection such as a cable
Best example is sharing the data in a single building. M A N : M A N In between LAN and WAN is the metropolitan network.
This networks that covers entire city, but uses LAN technology.
Cable television networks are the examples of MAN s.
The MAN s we are interested in carry information in the form of computer signals from one computer to another. W A N : W A N When the networks is spread over wide areas such as across cites, states or countries. It is called as a wide area network.
Communication take place via telephone lines, satellites or physical cable.
Best example is live telecast of sports. Components of networks : Components of networks The following are the components and features that all networks have in common
Server:- Computers that provide shared resources to network users.
Clients:- Computers that access shared network resources provided by a server.
Media:- The way in which the computers are connected.
Resources:- Files printers and other items to be used by network users CATEGORIES OF NETWORK : CATEGORIES OF NETWORK Server based networks
Peer to peer networks Server Based Network : Server Based Network A server is a computer on a network that functions as a server and is not used as client.
A server is optimized to service requests from network clients
Servers perform wide variety of tasks. Usually large networks have specialized servers for different tasks. Slide 26: Examples of specialized servers:-
File and print servers:- Manage user access and use of file and printer resources.
Application servers:- make the date on the server available to clients.
Mail servers:-manage electronic messaging between network users.
Communication servers:-handle data flow and E-mail messages. PEER TO PEER NETWORK : PEER TO PEER NETWORK Slide 29: In this there are no dedicated servers. All the computers are equal and therefore are termed as peers.
The main advantage of this network is simple in design and maintenance.
It is usually expensive to set up as compared to server-based networks. TOPOLOGIES : TOPOLOGIES Slide 31: Topology refers to the arrangement of computers, cables and other components on the network.
Networks can be configured in to following basic topologies:-
Ring Bus topology : Bus topology This is also known as liner bus. It consists of several computers which are attached to a common cable called trunk line.
This is also called as passive topology, which computers are not responsible for transferring of data.
In this failure of one computer does not affect the performance of the network Star topology : Star topology In this computers are connected to a centralized device known as HUB.
As each computer is connected to central point, this topology requires great deal of cabling.
If the centralized controller fails means the entire network is disabled. Ring topology : Ring topology In this computers are connected through a single circle of cable.
This is an active topology, as each computer acts like a repeater to boost the signal and sends it on to the next computer.
Failure of one computer can affect the entire network. INTERNET & INTRANET : INTERNET & INTRANET INTERNET : INTERNET Internet is an inter-connection between several computers of different types belonging to various networks all over the globe.
It is a networks of network. INTRANET : INTRANET An intranet is a private computer network that uses Internet technologies to securely share any part of an organization's information or operational systems with its employees.
Interconnectivity of two or more networks to form a single unit is called intranet.
It may consist of many interlinked local area networks and also use leased lines in the wide area network WORLD WIDE WEB(W W W) : WORLD WIDE WEB(W W W) The World Wide Web (commonly abbreviated as the "Web") is a system of interlinked hypertext documents accessed via the Internet.
With a Web browser, one can view Web pages that may contain text, images, videos, and other multimedia and navigate between them using hyperlinks HYPERTEXT : HYPERTEXT Hypertext is text, displayed on a computer, with references (hyperlinks) to other text that the reader can immediately access, usually by a mouse click or key press sequence WEB BROWSER : WEB BROWSER A web browser is a software application for retrieving, presenting, and traversing information resources on the World Wide Web.
The major web browsers are Windows Internet Explorer, Mozilla Firefox, Apple Safari, Google Chrome, and Opera. Web Pages : Web Pages A web page or webpage is a document or resource of information that is suitable for the World Wide Web and can be accessed through a web browser and displayed on a computer screen.
This information is usually in HTML or XHTML format. MULTIMEDIA : MULTIMEDIA Multimedia is media and content that uses a combination of different content forms.
Multimedia includes a combination of text, audio, still images, animation, video, and interactivity content forms. MULTIMEDIA APPLICATIONS : MULTIMEDIA APPLICATIONS Multimedia presentation
Foreign lang learning.
Special effects in films.
Animated advertisements Slide 54: So,
www is the most popular method of accessing the internet. The main reason of popularity is due to usage of concept called hypertext.
Hypertext is the new way of information storage and retrieval.
Hypertext documents on the internet called as web pages.
These web pages are created by using special language called hypertext markup language