INTERNETINTERNETThe Internet is a global systemof interconnected computernetworks that use the standard Internet protocol Suite (oftencalled TCP/IP) to serve billions of users worldwide. It is anetworkof networks that consists of millions of private,public, academic, business, and government networks, of localto global scope, that are linked by a broad array of electronic,wireless and optical networking technologies.
INTRANETINTRANET Intranet is the generic term for acollection of private computernetworks within an organization. Anintranet uses network technologies asa tool to facilitate communicationbetween people or work groups toimprove the data sharing capability.Intranets utilize standard networkhardware and software technologieslike Ethernet, Wi Fi, TCP/IP, Webbrowsers and Web servers. Anorganizations intranet typicallyincludes Internet access butis firewalled so that its computerscannot be reached directly from theoutside.A common extension to intranets,called extranets, opens this firewall to
Intranet BenefitsIntranet Benefits Increased, less expensive, environmentally friendlyinternal communication Low acquisition and deployment costs Low maintenance costs Increased information accessibility Timely, current information availability Easy information publication, distribution, and training
An extranet is a private network thatuses Internet technology and thepublic telecommunication system tosecurely share part of a businesssinformation or operations withsuppliers, vendors, partners,customers, or other businesses. Anextranet can be viewed as part of acompanys intranet that is extendedto users outside the company. Anextranet requires security andprivacy. These can include:1.Firewall server management2.use of digital certificates3.Encryption of messages4.the use of virtual private networks(VPNs) that tunnel through the publicnetwork.EXTRANETEXTRANET
Uses of InternetUses of Internet1) Email: By using internet now we can communicate in a fraction of seconds witha person who is sitting in the other part of the world. Today for bettercommunication, we can avail the facilities of e-mail. We can chat for hours withour loved ones.2) Information: The biggest advantage that internet offering is information. Theinternet and the World Wide Web has made it easy for anyone to accessinformation, and it can be of any type, as the internet is flooded with information.The internet and the World Wide Web has made it easy for anyone to accessinformation, and it can be of any type. Any kind of information on any topic isavailable on the Internet.3) Business: World trade has seen a big boom with the help of the internet, as ithas become easier for buyers and sellers to communicate and also to advertisetheir sites. Now a days most of the people are using online classified sites to buyor sell or advertising their products or services.4) Social Networking: Today social networking sites have become an importantpart of the online community. Almost all users are members use it for personaland business purposes. It is an awesome place to network with manyentrepreneurs who come here to begin building their own personal and business
5) Shopping: In today’s busy life most of us are interested to shop online. Nowa days almost anything can be bought with the use of the internet. In countrieslike USA most of consumers prefer to shop from home. We have manyshopping sites on internet like amazon.com, Dealsglobe.com etc.6) Entertainment: On internet we can find all forms of entertainment fromwatching films to playing games online. Almost anyone can find the right kindof entertainment for themselves. When people surf the Web, there arenumerous things that can be found. Music, hobbies, news and more can befound and shared on the Internet.7) E-Commerce: E-commerce is the concept used for any type of commercialmaneuvering, or business deals that involves the transfer of informationacross the globe via internet. It has become a phenomenon associated withany kind of shopping, almost anything. It has got a real amazing and range ofproducts from household needs, technology to entertainment.8) Services: Many services are now provided on the internet such as onlinebanking, job seeking, purchasing tickets for your favorite movies, andguidance services on array of topics in the every aspect of life, and hotelreservations and bills paying. Often these services are not available off-lineand can cost you more.
Hardware RequirementHardware RequirementMinimum For InternetMinimum For InternetConnectionConnection Computerwith browsersoftware Modems with communicationsoftware 800 MHz PentiumIII processor 512 MBRAM 80 GBorhigherHard diskcapacity High speed internet connection,cable
NetworkingNetworkingNetworking is the practice oflinking two ormore computingdevices togetherforthepurpose of sharing data.Networks are built with a mix ofcomputerhardware andcomputersoftware.
Types of NetworksTypes of NetworksLANs(Local Area Networks)LANs are networks usuallyconfined to a geographic area,such as a single building oracollege campus. LANs can besmall, linking as few as threecomputers, but often linkhundreds of computers used bythousands of people.
WIDE AREANETWORKS(WANS)• Wide area networking combinesmultiple LANs that aregeographically separate. This isaccomplished by connecting thedifferent LANs using services suchas dedicated leased phone lines,dial-up phone lines (bothsynchronous and asynchronous),satellite links, and data packetcarrierservices.
Networkcan be divided in to two main categories:Peer-to-peer.Server – based.In peer-to-peer networking there are no dedicated servers or hierarchyamong the computers. All of the computers are equal and therefore knownas peers. Normally each computer serves as Client/Server and there is noone assigned to be an administrator responsible for the entire network.Peer-to-peer networks are good choices for needs of small organizationswhere the users are allocated in the same general area, security is not anissue and the organization and the network will have limited growth withinthe foreseeable future.The term Client/server refers to the concept of sharing the work involved inprocessing data between the client computer and the most powerful servercomputer.
Distributed NetworkingDistributed Networking is adistributed computing networksystem, said to be "distributed"when the computerprogramming and the data to beworked on are spread out overmore than one computer,usually over a network.
Client-serverprotocolA client-server protocol is aprotocol in which there is asingle server which listens forconnections, usually on aspecific port and one or moreclients which connect to is oneof three basic groups ofNOS(Network OperatingSystem). All of the it.Client-Server Protocol machinesthat access the server are calledclients or workstations.
SECURITY ONSECURITY ONNETNETInternet security is a branch of computer security specificallyrelated to the Internet, often involving browser security but alsonetwork security on a more general level as it applies to otherapplications or on a whole. Its objective is to establish rules andmeasures to use against attacks over the Internet. The Internetrepresents an insecure channel for exchanging informationleading to a high risk of intrusion or fraud, such as phishing.Different methods have been used to protect the transfer ofdata, including encryption.