Web Technology Terms and Internet Applicationsمصطلحات تقنية الويب وتطبيقات الإنترنت
مقدمة الفصل
ماذا ستتعلم في هذا الفصل
- Web technology terms (client, server, browser, HTML, protocols, URL, DNS, domains, firewall, ISP, XML).
- History of the Internet.
- Internet applications: HTTP/HTTPS, e-mail, search engines.
- Intranets and extranets.
أقسام الفصل
- 1Client, server and web browserالعميل والخادم ومتصفح الويب
- 2HTML, web page, web site and hostingHTML وصفحة الويب والموقع والاستضافة
- 3Client, server and web browserالعميل والخادم ومتصفح الويب
- 4Protocols: TCP/IP, HTTP, HTTPS, SMTP, FTP and Telnetالبروتوكولات
- 5URL, DNS and domainsعنوان URL ونظام DNS والنطاقات
- 6The Internet, the World-Wide Web and the history of the Internetالإنترنت والويب وتاريخ الإنترنت
- 7Web server, ISP and firewallخادم الويب ومزود خدمة الإنترنت والجدار الناري
- 8E-commerce, Java applets and XMLالتجارة الإلكترونية وبريمجات جافا و XML
- 9Internet applications: e-mail and search enginesتطبيقات الإنترنت: البريد ومحركات البحث
- 10Intranetsالإنترانت
- 11Extranetsالإكسترانت
تلميح: استخدم أسهم لوحة المفاتيح للتنقل بين الشرائح.
Client and serverالعميل والخادم
Client, server and web browser
The requesting system in a client/server relationship, e.g., the user of an organization system is making client requests for records from the server.
In general, a server is a special computer that provides services to other computers in the same or other computers.
Server specifications on the slide:
- Choose the most powerful processor.
- Operating systems supported: Windows Server 2008.
- Make sure to include the appropriate number of licenses.
- Choose the appropriate memory.
- UPS with software to perform proper shutdown.
Web browser and HTMLالمتصفح و HTML
Client, server and web browser
The web client, called a browser, is the software that allows you to interact with information available on the Internet.
أمثلة من الشريحة
- Netscape Navigator
- MS Explorer
- Firefox
A tagging language used to compose documents that will be viewed by a web browser. It is a standard adopted so that no matter what computer platform someone is using, the web browser knows how to display the web document.
Web page, web site and hostingالصفحة والموقع والاستضافة
A mixture of text, graphics, sound and animation in the HTML format, to make information accessible and easy to understand using the Internet.
A collection of web pages connected (linked) by hypertext clickable links.
After a web site is designed it must be stored on a computer that can be accessed through the Internet and the World-Wide Web.
سؤال سريع
Client, server and web browser
Protocol and TCP/IPالبروتوكول و TCP/IP
Protocols: TCP/IP, HTTP, HTTPS, SMTP, FTP and Telnet
A set of conventions governing the processing and especially the data in an electronic communications system.
A set of protocols developed to allow cooperating computers to share resources across a network. They provide a few basic services that everyone needs (file transfer, electronic mail, remote logon, etc.) across a very large number of client and server systems.
Protocols you must knowبروتوكولات مهمة
Protocols: TCP/IP, HTTP, HTTPS, SMTP, FTP and Telnet
| Termالمصطلح | What the slides say it is forوظيفته في الشرائح |
|---|---|
| Protocol | Conventions governing the processing and especially the data in an electronic communications system |
| TCP/IP | Lets cooperating computers share resources across a network |
| HTTP | Rules for exchanging files (text, images, sound, video, multimedia) on the WWW |
| HTTPS | The same as HTTP but used securely |
| SMTP | Exchanging Internet mail between TCP/IP hosts |
| FTP |
|
| Telnet | Accessing someone else's computer, with their permission |
سؤال سريع
Protocols: TCP/IP, HTTP, HTTPS, SMTP, FTP and Telnet
URL and DNSURL و DNS
URL, DNS and domains
A "standard" way of easily expressing the location and data type of a resource. URLs in general take the form "protocol://address", where protocol is something like HTTP, FTP or telnet, and the address is the server name of a given resource or page.
A network service that associates host names (alphanumeric) with their equivalent TCP/IP address, by means of a standard look-up table.
Domainsالنطاقات
On the Internet, a domain is basically a registration category identifying geographic or purpose commonality. There are seven top-level domains currently in use.
| Top-level domainالنطاق | Meaning on the slideمعناه في الشريحة |
|---|---|
| com | A commercial organization. The largest domain extension currently used. |
| edu | An educational establishment such as a school or university. |
| gov | A branch of the U.S government that is strictly reserved for that purpose. |
| int | An international organization such as the United Nations. |
| net | A network organization. |
| org | A non-profit organization. |
| mil | A branch of the U.S military that is strictly reserved for that purpose. |
- In other parts of the world the final part of the domain name represents the country in which the server is located, like sd for Sudan.
The Internet and the World-Wide Webالإنترنت والويب
The Internet, the World-Wide Web and the history of the Internet
At its most basic level, a utility connecting localized computer networks (in a lab, a building, a department, or a campus) with computer networks that extend across a wider area, like a region or a continent.
- Technically, what distinguishes the Internet is its use of a set of protocols called TCP/IP.
- Two recent adaptations of the Internet technology are the Intranet and the Extranet.
- The term "Internet" comes out of the concept of "internetworking".
A pair of software applications which allow both distribution of and access to information on the Internet. The web is not the Internet but a means of distributing and accessing the information that is on it.
سؤال سريع
The Internet, the World-Wide Web and the history of the Internet
History of the Internetتاريخ الإنترنت
In the order the slides giveبترتيب الشرائح
- Early 1960s
Early projects by the US military (known as DARPAnet): a dozen networked computer systems of universities and institutions, sharing computers and fast communication between researchers through e-mails.
- Access
Only people in the government, military and academic had access to the network.
- 1991
The National Science Foundation gradually backed off from its subsidy of the backbone network, then allowed commercial access to the Internet.
- ISPs
A host of businesses called Internet Service Providers (ISPs) sprang up, providing dial-up access to the Internet.
Web server and ISPخادم الويب ومزود الخدمة
Web server, ISP and firewall
Stores and transmits web documents (files). It uses the HTTP protocol to connect to other computers and distribute information.
أمثلة من الشريحة
- IIS
- Apache
- Sun Java System Web Server
A company that provides individuals and other companies access to the Internet and other related services such as web site development and hosting (web site storage).
- The larger ISPs have their own high-speed leased lines so that they are less dependent on the telecommunication providers and can provide better service to their customers.
Firewallالجدار الناري
A program, usually an Internet gateway server, that protects the resources of one network from users from other networks. Any enterprise will want a firewall to prevent outsiders from accessing its own private data resources.
Screening methods on the slide:
- Screen requests to make sure they come from acceptable domain names and IP addresses.
- Do not allow Telnet access into your network except for your own users.
سؤال سريع
Web server, ISP and firewall
E-commerce and Java appletsالتجارة الإلكترونية والبريمجات
E-commerce, Java applets and XML
The buying and selling of goods and services on the Internet, especially on the World-Wide Web.
A small program run on the Web, using Java, the object-oriented programming language. It can be sent along with a web page to a user, and can perform interactive animations and immediate calculations without having to send a user's request back to the server.
XMLلغة XML
- A standard way of describing data would enable a user to send an intelligent agent (a program) to each computer maker's web site, gather data, and then make a valid comparison.
- XML can be used by any individual or group of individuals or companies that wants to share information in a consistent way.
- XML is currently a formal recommendation from the World-Wide Web Consortium (W3C).
XML and HTML (both)المشترك
- Contain markup symbols to describe the contents of a page or file.
HTMLHTML
- Describes the content of a web page (mainly text and graphic images) only in terms of how it is to be displayed and interacted with, e.g., <P> starts a new paragraph.
E-mailالبريد الإلكتروني
The exchange of computer-stored messages by telecommunication. You can send messages (text, graphic images and sound files) as attachments.
- E-mail was one of the first uses of the Internet. Probably it is still the most widely used Internet application.
- A large percentage of the total traffic over the Internet is e-mail.
- It uses Simple Mail Transfer Protocol (SMTP).
Search engines and meta-search enginesمحركات البحث
Internet applications: e-mail and search engines
Search engines are web sites that sort through by keywords and categories.
| Search enginesمحركات البحث | Meta-search enginesمحركات البحث الفوقية | |
|---|---|---|
| Database | Store information in databases | No database maintenance |
| Results | Return a list of sites as hyperlinks | Combine results from multiple search engines |
| Examples on the slides | Google, Yahoo, Lycos, Altavista |
|
Intranetsالإنترانت
Intranets are private corporate information and collaboration systems that use Internet software and standards.
Why an intranet (slide 32):
- Can increase market share, profitability, and efficiency.
- Ideal place for publishing continuously updated corporate information.
- Powerful, not expensive communications alternative that can provide information anywhere at anytime.
- Can be used across wide area networks; web server software inter-operates well; web servers do not need large capital expenditures in hardware.
- Intranets can be relatively easy to install, and inexpensive to administer. They also eliminate printing and out-of-date information.
How an intranet helps a companyاستخدامات الإنترانت
Intranets
استخدامات من الشرائح
- Procedures manuals
- Company practices
- Company phone book
- Catalog and inventory lists
- Employee benefits information
- Bulletin boards
- Job postings
- In-house newsletters
- Training
- Presentations
- Order processing
- Expense report
- Sales force automation
- Help-desk and technical support
- Company suppliers information
- Video conferencing
- Access, search and sort database records dynamically by converting databases to HTML on the fly.
- Putting such applications on an intranet can serve a large group of users at a substantially low cost.
سؤال سريع
Intranets
Extranetsالإكسترانت
A collaborative network that uses Internet technology to link businesses with their suppliers, customers or other businesses that share common goals.
- It can be viewed either as part of a company's intranet that is made accessible to other companies, or as a collaborative Internet connection with other companies.
- The shared information can be accessible only to the collaborating parties or can be publicly accessible.
- An extranet usually requires a degree of security and privacy from competitors.
سؤال سريع
Extranets
الخلاصة
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ما راجعته في هذا الدرس
- Client, server and web browserالعميل والخادم ومتصفح الويب
- HTML, web page, web site and hostingHTML وصفحة الويب والموقع والاستضافة
- Client, server and web browserالعميل والخادم ومتصفح الويب
- Protocols: TCP/IP, HTTP, HTTPS, SMTP, FTP and Telnetالبروتوكولات
- URL, DNS and domainsعنوان URL ونظام DNS والنطاقات
- The Internet, the World-Wide Web and the history of the Internetالإنترنت والويب وتاريخ الإنترنت
- Web server, ISP and firewallخادم الويب ومزود خدمة الإنترنت والجدار الناري
- E-commerce, Java applets and XMLالتجارة الإلكترونية وبريمجات جافا و XML
- Internet applications: e-mail and search enginesتطبيقات الإنترنت: البريد ومحركات البحث
- Intranetsالإنترانت
- Extranetsالإكسترانت