Computer World. Матросова Т.А. - 27 стр.

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УлГТУ | Ульяновск

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26
Access to databases, computerized library card catalogs, weather reports
and other information services, as well as live, online games that let you
compete with players from around the world.
Additional services that may be offered include:
WAIS
Wide-area Information Server; a program that can search dozens of
databases in one search.
Go phe r
A program that gives you easy access to dozens of other online databases
and services by making selections on a menu. You'll also be able to use these
to copy text files and some programs to your mailbox.
IRC
Internet Relay Chat, a CB simulator that lets you have live keyboard chats
with people around the world.
Clarinet
News, sports, feature stories and columns from Universal Press
International; Newsbytes computer news.
TEXT 4
Translate the text in written form.
Due to the network’s complexity, simulation plays a vital role in attempting to
characterize both the behavior of the current Internet and the possible effects of
proposed changes to its operation. Yet modeling and simulating the Internet is not an
easy task. The goal of this paper is to discuss some of the issues and difficulties in
modeling Internet traffic, topologies, and protocols. The discussion is not meant as a
call to abandon Internet simulations as an impossible task. Instead, the purpose is to
share insights about some of the dangers and pitfalls in modeling and simulating the
Internet, in order to strengthen the contribution of simulations in network research. A
second purpose is to clearly and explicitly acknowledge the limitations as well as the
potential of simulations and of model-based research, so that we do not weaken our
simulations by claiming too much for them.
TEXT 5
Read the text.
MOD EM AD VA NC ES
Modem technology has advanced tremendously since 1975, when 300bps
modems were considered the maximum practical «standard speed» for modems.
Built-in limits to copper wire circuits and telephone switching equipment made faster
modems practical only for corporate, capital-intensive leased-line networks, or so
many thought.
Things have changed since then. We've seen the top speed of affordable
modems rise from 300bps to around 19,200bps, a factor of 64. These newer modems

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