Published on December 8, 2013
INTERNET, WWW AND E-MAIL TOPIC1: NETWORK AND INTERNET FUNDAMENTAL
OUTLINES NETWORK COMPONENTS WHAT IS NETWORK TYPES OF NETWORKS BENEFITS RISK OF NETWORK COMPUTING INTERNET HISTORY WHAT IS INTERNET WHAT IS INTRANET WHAT IS EXTRANET
NETWORK DEFINITION A network is a set of devices connected by communication links. The connections ( Network Link) between nodes are established using either cable media or wireless media The best known computer network is the Internet
NETWORK COMPONENTS Computer (sender+ receiver) 2. Message 3. Protocol 1.
BENEFITS OF NETWORK Resource sharing –Printer, processing power, disk space etc –Reduces cost Communication –Email, chatting, video conferencing
RISK OF NETWORKS COMPUTING The risk of leakage of authenticated data on the network by the attack of hackers.
TYPES OF NETWOKS
LAN Privately owned over a small area(500 m)
MAN Bigger version of LAN, Covers an area as big as a city
WAN Covers whole nation or continent
INTERNET The largest network of networks in the world. Uses TCP/IP protocols and packet switching. Runs on any communications substrate
PACKET SWITCHING A mode of data transmission in which a message is broken into a number of parts that are sent independently, over whatever route is optimum for each packet, and reassembled at the destination.
WHAT IS PROTOCOL A protocol is the special set of rules that end points in a telecommunication connection. use when they communicate.
TCP/IP PROTOCOL Transmission Control Protocol/Internet Protocol: TCP/IP Is the basic communication language OR protocol of Internet.
TCP: TRANSMISSION CONTROL PROTOCOL Is one of the core protocol of the internet protocol suite. Specify how data should be formatted, addressed When you are set up with direct access to the internet, your computer is provided with a copy of the TCP/IP program just as every other computer that you may send message to or get information from also has a copy of TCP/IP.
IP: INTERNET PROTOCOL Internet protocol Handles the address part of each packet so that it gets to the right destination.
HOW TCP/IP WOPRKS How data travels over
INTRANET A network based on TCP/IP protocols (an internet) belonging to an organization, Is a collection of private computer networks within an organization. accessible only by the organization's members, employees, or others with authorization.
EXTRANET refers to an intranet that is partially accessible to authorized outsiders. An extranet provides various levels of accessibility to outsiders. You can access an extranet only if you have a valid username and password, and your identity determines which parts of the extranet you can view. Extranets are becoming a very popular means for business partners to exchange information.
TERMENOLOGY Memex the most important mechanism, conceived by Vannevar Bush Brush introduced the idea for a microfilm based machine for storing and retrieving knowledge. It considered as closed to the modern hypertext system .
TERMENOLOGY Mathematical theory of communication: is an influential 1948 . Article by mathematician Claude E. Shannon. Claude Shannon demonstrate how to generate “English looking” text using Markov chains. www.khanacademy.org/math/applied-
TERMENOLOGY Silicon Chip: was first discovered by Jack S Kilby at Texas in 1958, that are imprinted onto a tiny chip of a semiconducting material, such as Silicon . It’s an electronic equipment consisting of a small crystal of silicon semiconductor fabricated to carry out a number of electronic function in an integrated circuit Example: microprocessor chip
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The best-known computer network is the Internet. Network computer devices that originate, route and terminate the data are called network nodes.