英语科普文选：因特网能为我们做什么_0

英语科普文选：因特网能为我们做什么

What can Internet do for us? Internet has four main applications as follows:

l. E－mail. With Internet, people can compose, send, and receive electronic mails. Many people get dozens of messages a day and consider it as their primary way of interacting with the outside world, far outdistancing the telephone and snail mail.

2. News. Newsgroups are specialzied forums in which users with a common interest can exchagne messages. Thousands of newsgroups exist on Internet,on technical and nontechnical topics,including computers, science, ecreation, and politics.

3. Remote login. Using the Telnet,Rlogin, or other programs, the user anywhere on Internet can log into any other machine on which he has an account.

4. File transfer. Using the FTP program, it is possible to copy files from one machine on Internet to another. Vast numbers of articles, databases, and other information are available in this way.

The Network Computer

The network computer, also known as the Internet toaster,Internet appliance or Internet device,is the low cost,no maintenance desktop device. It allows users to effortlessly connect to Internet and network resources. From there, they can share any resource and perform all computing tasks that they currently do on their PCs.

The network computer offers simplicity. Stripped of the hardware and software that complicate the PC life and only capable of network access and display, the network computer relies on the network for virtually all software, services, processing, data, and resources. It eliminates the continuous cycle of desktop hardware and software upgrades, pushing that burden instead on to the network.

Need the latest word processor or spreadsheet? Run it off the server, Want to save your work? Just send it off to the network, where it will be stored secured, and backed up.

Firewall: a Measure of Network Security

With the popularity of Internet,it is increasingly difficult to guarantee the network security. Sometimes the network was breached because of not only hackers' visit but also authorized users' care out of ordinary. Firewall just is an effective measure of network security. It will ensure that all communications conform to your Security policy.

Once two lads broke into the university network,created a bulletin board,loaded popular commercial software on it and invited users across Internet to download the packages. Thanks to a firewall, network administrators found the system breached. They checked the audit and found the students' IP addresses, names and location. The police arrested the two hackers.

E－mail

One important application for Internet is communication between computer users by the electronic mail, or E－mail. E－mail allows users to electronically transmit and receive messages, text, or data. E-mail functions futher like a mailbox: the user can send messages whether or not the intended receiver is currently on the network and the message is stored, along with a signal for the