📅  最后修改于: 2020-12-14 05:55:44             🧑  作者: Mango
Internet服务使我们能够通过Internet访问大量信息,例如文本,图形,声音和软件。下图显示了Internet服务的四个不同类别。
有多种通信服务可用于与个人或团体交换信息。下表简要介绍了这些服务:
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. |
存在几种信息检索服务,可轻松访问Internet上存在的信息。下表简要介绍了这些服务:
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服务允许在Web上的应用程序之间交换信息。使用Web服务,应用程序可以轻松地彼此交互。
使用效用计算的概念来提供Web服务。
WWW也称为W3。它提供了一种访问Internet上分布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,超链接。超链接允许用户在文档之间导航。
视频会议或视频电话会议是一种借助电信技术通过双向视频和音频传输进行通信的方法。
这种会议方式仅连接两个位置。
这种会议模式通过多点控制单元(MCU)连接两个以上的位置。