Lesson 2 Section 3 The Web, Intranets, and Extranets.

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Web Networks. Connected systems that work similarly - they pass information around in ... Information is broken into bundles before it is sent over the Internet. ...
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Lesson 2 Chapter 3 The Internet, Intranets, and Extranets

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Learning Objectives Define how the Internet functions Describe the administrations connected with the Internet Describe the World Wide Web Define the terms intranet and extranet and talk about how associations use them Identify who is utilizing the Web to direct business

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Internet Networks Linked systems that work similarly - they pass information around in bundles, each of which conveys the locations of its sender and collector. The Internet (Figure 7.1) The Internet transmits information starting with one PC (called a host) then onto the next.

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Use and Functioning of the Internet Interconnected systems Global however US is the biggest client Internet Protocol (IP) Research for a quicker Internet Internet2 (I2) Next Generation Internet (NGI) Corporate endeavors

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How the Internet Works Hosts with Uniform Resource Locator (URL) Routers forward parcels to different systems Internet Protocol Stack (TCP/IP) Internet Protocol (IP) Transport Control Protocol (TCP) Backbones One of the Internet\'s fast, long separation correspondences joins.

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How the Internet Works Uniform Resource Locator (URL) http://www.whitehouse.gov World Wide Web Domain class Hypertext exchange convention Host Network Name

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The Internet is Based on the Client-Server Model In customer/server figuring, procedures are partitioned between the customer and the server. This relationship depends on a progression of solicitations and reactions. Customer: Requests administrations or data from another PC (the server PC). Server: Responds to the customer\'s solicitation by sending the consequences of the solicitation back to the customer PC.

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Client - Server Computing

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CLIENT SERVER REQUEST Client Program RESPONSE Server Program Send Request Process Request Read Results Send Back Results The Client-Server Model This outline delineates the relationship amongst customer and server PCs. The customer demands data; the server forms the solicitation and sends a reaction back to the customer.

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Examples of Client Server Transactions FTP (record exchange convention) - A FTP customer program contacts a FTP server and solicitations the exchange of a document; the FTP server reacts by exchanging the record to the customer. WWW (World Wide Web) - For this situation the customer system is a program. A program demands the substance of a website page and shows the outcomes on the client\'s PC. Email - A mail customer program empowers the client to communicate with a server keeping in mind the end goal to get to, peruse and send electronic mail messages.

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To: Destination: From: Instruction Fields: Data Packets: The Internet "Letter"

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What is a Packet? A bundle is a solitary unit, or "package", of information that is sent over a system. Information is broken into bundles before it is sent over the Internet. Sorts of information that are sent over the Internet utilizing bundles include: E-mail messages Files, by means of File Transfer Protocol (FTP) Web pages, by means of the World Wide Web (WWW)

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To: Destination: From: Instruction Fields: Data Parts of the Packet The HEADER of a parcel contains both the starting and destination IP (Internet Protocol) address. The header additionally contains coding to handle transmission blunders and keep bundles streaming. Switches utilize the information in the header to get the parcel to the right deliver and to reassemble it at the destination. The DATA segment of the parcel contains the email message, the site page data, or the substance of the document.

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Transmission Control Protocol/Internet Protocol (TCP/IP ) TCP/IP is an accumulation of conventions, or tenets, that represent the way information goes starting with one machine then onto the next crosswise over systems. The Internet depends on TCP/IP. TCP/IP

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Internet Protocol Determines the amount of information can fit into a solitary bundle Breaks the information into parcels. Places header data into the bundle, empowering the parcel to be sent from switch to switch until it achieves the last destination..

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Hi Bob! Hello there Bob! Parcel Switching Example

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Hi Bob! Greetings Bob! Hey Bob! Hello there Bob! Hello there Bob! Howdy Bob! Hello Bob! Howdy Bob! Howdy Bob! Bundle Switching Example

Slide 18 Hi Bob! Greetings Bob! Hello there Bob! Hey Bob! Hello there Bob! Parcel Switching Example Router

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Hi Bob! Hey Bob! Parcel Switching Example

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Hi Bob! Hello there Bob! Hello there Bob! Hello Bob! Greetings Bob! Greetings Bob! Howdy Bob! Howdy Bob! Bundle Switching Example

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U.S. Top-Level Domain Affiliations Affiliation ID Affiliation arts cultural and excitement exercises com business associations edu educational locales firm businesses and firms gov government destinations info information administration suppliers mil military locales nom individuals net networking associations org organizations rec recreational exercises store businesses offering products for buy web entities identified with World Wide Web exercises net networking associations

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Accessing the Internet Fig 7.2

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Internet Service Providers (ISPs) Provide Internet access to record holders Monthly charge shifts Some are free

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Internet Service Providers Internet Service Provider Web Address AT&T WorldNet Service www.att.com Digex, Inc. www.digex.net GTE Internetworking www.gte.net IBM Internet Connection www.ibm.net MCI Internet www.mci2000.com NetCom On-Line Communication Services www.netcom.com PSINet, Inc. www.psinet.com Sprint Internet Services www.sprint.net Uunet Technologies, Inc. www.us.uu.net

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Internet Services E-mail (Electronic mail) Can incorporate pictures, connections, or HTML Routed by passages and switches Telnet: remote login FTP: document exchange

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Internet Services Chat rooms: permit intelligent discussions Instant Messaging: on the web, ongoing correspondence over the Internet Videoconferencing Internet telephone

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Internet Services Content gushing: exchanges interactive media records constantly so clients can see them progressively Music, radio & video 3-D Internet locales

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The World Wide Web

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The WWW is Just a Part of the Internet The World Wide Web, likewise alluded to as the WWW and "the Web," is the universe of data accessible by means of hypertext exchange convention (HTTP). The World Wide Web and HTTP: permit you to make "links" starting with one bit of data then onto the next; can fuse references to sounds, representation, and motion pictures, and so forth.; "understand" other Internet conventions, for example, ftp, gopher, and telnet.

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WWW Pages use Hyperlinks The Web presents data as a progression of "documents," regularly alluded to as pages, that are readied utilizing the Hypertext Markup Language (HTML). Utilizing HTML, the report\'s creator can extraordinarily code areas of the archive to "point" to other data assets. These uncommonly coded segments are alluded to as hypertext connections. Clients seeing the site page can choose the hypertext interface and recover or associate with the data asset that the connection focuses to. Library Catalog (telnet) Webpage Software Repository (ftp) join gopher website w/pictures & sounds join

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The World Wide Web An accumulation of a huge number of autonomously possessed PCs that cooperate as one in an Internet administration. Utilizes a menu-based methodology and hyperlink innovation in a customer/server topology. Hypermedia Tools that interface the information on Web pages, permitting clients to get to subjects in whatever request they wish. Landing page The spread page for a Web webpage that has design, titles, and beat up content.

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Uniform Resource Locators ( URL) Identify Sources of Data on The Internet A URL recognizes a specific Internet asset. e.g. a Web page, a gopher server, a library inventory, a picture, or a content record. URLs speak to an institutionalized tending to conspire for Internet assets. The fundamental structure of a URL is various leveled moving from left to right: convention://server-name.domain-name.top-level space: port/registry/filename Examples: http://www.healthyway.com:8080/exercise/mtbike.html gopher://gopher.state.edu/ftp://ftp.company.com/

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Several Interesting Web Sites Library of Congress http://lcweb.loc.gov PointCast http://www.pointcast.com In-Box Direct http://www.netscape.com Online Career Center http://occ.com New York Times http://www.nytimes.com Project Gutenberg http://www.gutenberg.org Sportsline USA http://www.sportsline.com White House http://www.whitehouse.gov MIT CS Lab http://www.lcs.mit.edu The Wall Street Journal http://www.wsj.com

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Web Terminology Web Server: Computer that stores website pages. Web Browser Software that makes an exceptional hypermedia-construct menu with respect to your PC screen and gives a graphical interface to the Web. Site page A screen of data sent to an asking for client and introduced through a program. Applet A little program installed in Web pages Search motors Programs to discover site pages of interest.

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Internet Services Shopping on the Web Bots: web seek instruments Web Auctions Office on the web

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Webcasting otherwise known as Push Technology Consolidates data as per a client\'s profile & shows in the program

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Intranets and Extranets Intranet An interior corporate system constructed utilizing Internet and World Wide Web benchmarks and items that permits workers of an association to access corporate data. Extranet A system in view of Web innovations that connections chose assets of the intranet of an organization with its clients, suppliers, or different business accomplices. 22

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