Internet Technologies 简明教程
Internet Services
Internet Services 让我们可以通过互联网获取海量的信息,例如文本、图片、声音和软件。下图显示了四种不同类型的互联网服务。
Internet Services allows us to access huge amount of information such as text, graphics, sound and software over the internet. Following diagram shows the four different categories of Internet Services.
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Communication Services
有各种通信服务可供使用,它们提供了与个人或群组交换信息的功能。下表对这些服务进行了简要介绍:
There are various Communication Services available that offer exchange of information with individuals or groups. The following table gives a brief introduction to these services:
S.N. |
Service Description |
1 |
Electronic Mail Used to send electronic message over the internet. |
2 |
Telnet Used to log on to a remote computer that is attached to internet. |
3 |
Newsgroup Offers a forum for people to discuss topics of common interests. |
4 |
Internet Relay Chat (IRC) Allows the people from all over the world to communicate in real time. |
5 |
Mailing Lists Used to organize group of internet users to share common information through e-mail. |
6 |
Internet Telephony (VoIP) Allows the internet users to talk across internet to any PC equipped to receive the call. |
7 |
Instant Messaging Offers real time chat between individuals and group of people. Eg. Yahoo messenger, MSN messenger. |
Information Retrieval Services
有许多信息检索服务可轻松访问互联网上的信息。下表对这些服务进行了简要介绍:
There exist several Information retrieval services offering easy access to information present on the internet. The following table gives a brief introduction to these services:
S.N. |
Service Description |
1 |
File Transfer Protocol (FTP) Enable the users to transfer files. |
2 |
Archie It’s updated database of public FTP sites and their content. It helps to search a file by its name. |
3 |
Gopher Used to search, retrieve, and display documents on remote sites. |
4 |
*Very Easy Rodent Oriented Netwide Index to Computer Achieved (VERONICA) * VERONICA is gopher based resource. It allows access to the information resource stored on gopher’s servers. |
Web Services
网络服务允许在网络上的应用程序之间交换信息。通过使用网络服务,应用程序之间可以轻松地进行交互。
Web services allow exchange of information between applications on the web. Using web services, applications can easily interact with each other.
World Wide Web (WWW)
WWW 也称为 W3。它提供了一种访问互联网上分发在多个服务器上的文档的方法。这些文档可能包含文本、图形、音频、视频和超链接。超链接允许用户在文档之间导航。
WWW is also known as W3. It offers a way to access documents spread over the several servers over the internet. These documents may contain texts, graphics, audio, video, hyperlinks. The hyperlinks allow the users to navigate between the documents.