E-Business Ch3 PDF

Electronic Business Systems Dr. Noha Ibrahem Chapter 3  Domain Names ❖ To make the numbering system easier to use, an alternative addressing method that uses words was created. ❖ An address, such as www.course.com, is called a domain name. ❖ The last part of a domain name...

Electronic Business Systems Dr. Noha Ibrahem Chapter 3  Domain Names ❖ To make the numbering system easier to use, an alternative addressing method that uses words was created. ❖ An address, such as www.course.com, is called a domain name. ❖ The last part of a domain name (i.e., ‘.com’) is the most general identifier in the name and is called a ‘top-level domain’ (TLD).  Domain Names Reference particular computers on the Internet Divided into segments separated by periods ❑ For example, in the case of “www.microsoft.com” ✓ “www” is the specific computer ✓ “com” is the top-level domain ✓ “Microsoft” is the subdomain ❑ Internet Assigned Numbers Authority (IANA) ✓ controls the domain name system ❑ Network Solutions, Inc. (NSI) ✓ issues and administers domain names for most of the top-level domains Top-level Domain Names  Web Page Delivery ❖ Hypertext Transfer Protocol (HTTP) is the set of rules for delivering Web pages over the Internet. ❖ HTTP uses the client/server model ❖ A user’s Web browser opens an HTTP session and sends a request for a Web page to a remote server. ❖ In response, the server creates an HTTP response message that is sent back to the client’s Web browser. ❖ The combination of the protocol name and the domain name is called a uniform resource locator (URL).  SMTP, POP, MIME, and IMAP ❖ E-mail sent across the Internet must also be formatted to a common set of rules, otherwise e-mail created by one company (or Web site) could not be read by a person at another company. ❖ Simple Mail Transfer Protocol (SMTP) specifies the exact format of a mail message and describes how mail is to be administered at the Internet and network level.  SMTP, POP, MIME, and IMAP ❖ An e-mail program running on a user’s computer can request mail from the company’s main e-mail computer using the Post Office Protocol (POP). ❖ Multipurpose Internet Mail Extensions (MIME) allow the user to attach binary files to e-mail. ❖ The Interactive Mail Access Protocol (IMAP) performs the same basic functions as POP but includes additional features.  Internet Client/Server Applications Application Protocol Purpose E-mail Simple Mail Transport Protocol (SMTP) Allows the transmission of text messages Post Office Protocol version 3 (POP3) and binary attachments across the Internet Multipurpose Internet Mail Extensions (MIME) File Transfer File Transfer Protocol (FTP) Enables files to be uploaded and downloaded across the Internet. Provides a way for users to talk to one Chat Internet Relay Chat Protocol (IRC) another in real-time over the Internet. The real-time chat groups are called channels Discussion forums where users can UseNet Newsgroups Network News Transfer Protocol (NNTP) asynchronously post messages and read messages posted by others. Offers access to hypertext documents, World Wide Web Hypertext Transport Protocol (HTTP) executable programs, and other Internet (Web) resources.  Intranets and Extranets ❑ Intranets ❖ An intranet is an interconnected network (or internet –small “i” intended) that does not extend beyond the organization that created it. ❖ Intranets are an extremely popular and low-cost way to distribute corporate information. ❖ An intranet uses Web browsers and Internet-based protocols (including TCP/IP, FTP, Telnet, HTML, and HTTP) and often includes a firewall. The Intranet ❑ Extranets ❖ Extranets are intranets that have been extended to include specific entities outside the boundaries of the organization (business partners, suppliers, etc.). ❖ An extranet can be a public network, a secure (private) network, or a virtual private network (VPN). ❖ A public network is any computer or telecommunications network that is available to the public. ❖ A private network is a private, leased-line connection between two companies that physically connects their intranets to one another. The Extranets Internet Programming  Program A Set of Steps to Solve a Problem(Objective, Goal,…) Heuristic Solution Algorithmic Solution Human Judgment Well Defined Routs Knowledge Well Defined Steps Experience Computation Models Includes Algorithmic Parts  Computer Programming ❖ Markup Languages ▪ Tags: ▪ Header Size 1 ❖ Procedural Languages ▪ Set of commands: sequential structure with branching and looping ❖ Object Oriented/Based Languages ▪ Set of objects include data and procedures  Markup Languages and the Web ❖ Web pages are marked with tags to indicate the display and formatting of page elements.  Hypertext Markup Language ❖ What is HTML? ❑HTML stands for Hyper Text Markup Language ❑HTML is the standard markup language for creating Web pages ❑HTML describes the structure of a Web page ❑HTML consists of a series of elements ❑HTML elements tell the browser how to display the content Ex1 ❑ The declaration defines that this document is an HTML document ❑ The element is the root element of an HTML page ❑ The element contains meta information about the HTML Page Title page ❑ The element specifies a title for the HTML page (which is My First Heading shown in the browser's title bar or in the page's tab) My first paragraph. ❑ The element defines a large heading ❑ The element defines a paragraph ❑ The element defines the document's body, and is a container for all the visible contents, such as headings, paragraphs, images, hyperlinks, tables, lists, etc.  Page Title My First Heading This is heading 1 This is heading 2 This is heading 3 My first paragraph. This is our first section in E-business Subject Wish It will be nice..