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54
Services and Resources of the Internet
A common resource provided by the Internet is a worldwide
system for sending and receiving electronic mail, known as e-mail. In
fact, e-mail represents a large portion of all Internet traffic and is for
many the only Internet resource they use. How does it work? To
answer that question, let's review the ordinary mail system first.
Imagine that you live in Canada and wish to send a letter to
your daughter living in Moscow. After properly addressing the
envelope, you mail it, starting the letter's journey. At a postal facility,
the letter is routed to the next location, perhaps a regional or national
distribution center, and then to a local post office near your daughter.
A similar process occurs with e-mail. After your letter is
composed on your computer, you must specify an e-mail address that
identifies your daughter. Once you send this electronic letter, it travels
from your computer, often through a device called a modem, which
connects your computer to the Internet via the telephone network. Off
it goes, bound for various computers that act like local and national
postal routing facilities. They have enough information to get the letter
to a destination computer, where your daughter can retrieve it. Unlike
the regular mail, e-mail often reaches its destination, even on other
continents, in minutes or less unless some part of the network is
heavily congested or temporarily out of order. When your daughter
inspects her electronic mailbox, she will discover your e-mail. The
speed of e-mail and the ease with which it can be sent even to multiple
recipients all over the world make it a popular form of communication.
Choose the correct answer – a, b or c.
1. What do you use a modem for?
a) to print a document
b) to play music
c) to send messages along a telephone line
2. What do you see when you want to look for sites on the
World Wide Web?
a) a browser
b) a CD-ROM
c) a printer
3. What can you use the Internet for?
a) to delete a file from your computer
b) to help you find information and communicate with people
c) to make your computer work faster
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scramble their letter's sensitive contents before mailing it. At the other
end, the receiving party may need similar software for unscrambling
the message.
Recently, much discussion has focused on the exchange of
credit-card and other sensitive information for commercial use on the
Internet. Although substantial innovations are expected to strengthen
security, the noted American computer security analyst Dorothy
Denning states: "Completely secure systems are not possible, but the
risk can be reduced considerably, probably to a level commensurate
with the value of the information stored on the systems and the threat
posed by both hackers and insiders. Absolute security is not realizable
in any computer system, whether connected to the Internet or not.
Part III
TEXT 1
Pre-reading task
1. What can you say about modern science development?
2. Why is science so important in the modern world?
3. Read the text “Science” and discuss the following questions
in group:
a) How does science help to keep peace in the world?
b) How can science solve the energy program?
c) What proves that the study of science is important to
understand natural world?
Science
Science is important to most people living in the modern world
for a number of reasons. In particular, science is important to world
peace and understanding, to the understanding of technology, and to
our understanding of the world.
Science is important to world peace in many ways. On one
hand, scientists have helped to develop many of the modern tools of
war. On the other hand, they have also helped to keep the peace
through research which has improved life for people. Scientists have
helped us to understand the problem of supplying the world with
enough energy; they have begun to develop a number of solutions to
the energy problem - for example, using energy from the sun and from
the atom. Scientists have also analyzed the world's resources. We can
begin learning to share the resources with the knowledge provided to
us by science. Science studies the Universe and how to use its
