Internet Technologies 简明教程

Internet Overview

Internet

互联网被定义为信息高速公路，可以用来访问网络上的信息。但是，它还可以用以下多种方式来定义：

Internet is defined as an Information super Highway, to access information over the web. However, It can be defined in many ways as follows:

  1. Internet is a world-wide global system of interconnected computer networks.

  2. Internet uses the standard Internet Protocol (TCP/IP).

  3. Every computer in internet is identified by a unique IP address.

  4. IP Address is a unique set of numbers (such as 110.22.33.114) which identifies a computer location.

  5. A special computer DNS (Domain Name Server) is used to give name to the IP Address so that user can locate a computer by a name.

  6. For example, a DNS server will resolve a name http://www.tutorialspoint.com to a particular IP address to uniquely identify the computer on which this website is hosted.

  7. Internet is accessible to every user all over the world.

internet internet

Evolution

互联网的概念起源于 1969 年，并且已经经历了若干技术和基础设施方面的变革，如下所述：

The concept of Internet was originated in 1969 and has undergone several technological & Infrastructural changes as discussed below:

  1. The origin of Internet devised from the concept of Advanced Research Project Agency Network (ARPANET).

  2. ARPANET was developed by United States Department of Defense.

  3. Basic purpose of ARPANET was to provide communication among the various bodies of government.

  4. Initially, there were only four nodes, formally called Hosts.

  5. In 1972, the ARPANET spread over the globe with 23 nodes located at different countries and thus became known as Internet.

  6. By the time, with invention of new technologies such as TCP/IP protocols, DNS, WWW, browsers, scripting languages etc.,Internet provided a medium to publish and access information over the web.

Advantages

互联网几乎涵盖了人们能想到的生活的方方面面。在这里，我们将讨论互联网的一些优势：

Internet covers almost every aspect of life, one can think of. Here, we will discuss some of the advantages of Internet:

internet internet advantages

  1. Internet allows us to communicate with the people sitting at remote locations. There are various apps available on the wed that uses Internet as a medium for communication. One can find various social networking sites such as:

  2. One can surf for any kind of information over the internet. Information regarding various topics such as Technology, Health & Science, Social Studies, Geographical Information, Information Technology, Products etc can be surfed with help of a search engine.

  3. Apart from communication and source of information, internet also serves a medium for entertainment. Following are the various modes for entertainment over internet.

  4. Internet allows us to use many services like:

  5. Internet provides concept of electronic commerce, that allows the business deals to be conducted on electronic systems

Disadvantages

然而，互联网已被证明是几乎每个领域的强大信息来源，但仍存在着以下许多缺点：

However, Internet has prooved to be a powerful source of information in almost every field, yet there exists many disadvanatges discussed below:

internet internet disadvantages

  1. There are always chances to loose personal information such as name, address, credit card number. Therefore, one should be very careful while sharing such information. One should use credit cards only through authenticated sites.

  2. Another disadvantage is the Spamming.Spamming corresponds to the unwanted e-mails in bulk. These e-mails serve no purpose and lead to obstruction of entire system.

  3. Virus can easily be spread to the computers connected to internet. Such virus attacks may cause your system to crash or your important data may get deleted.

  4. Also a biggest threat on internet is pornography. There are many pornographic sites that can be found, letting your children to use internet which indirectly affects the children healthy mental life.

  5. There are various websites that do not provide the authenticated information. This leads to misconception among many people.