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a network is a group of computers linked together. it
consists of at least two computers joined by cables
on the same desk or same office, but it can also
mean thousands of computers across the world. the
users of a network can share hardware (scanner,
printer, fax machine, access data in other
people's computers and run other programs stored in
the network although not installed on their own
computer.
a network consists of:
• nodes, that is to say different computers and
devices;
• a connecting medium, such as cables or a wireless
connection;
• routers, which are specia l computers enabled to
send messages;
• switches, that is to say devices which help to
select a specific path to follow.
networks can be connected in different ways
according to the area they cover.
a lan (local area network) is generally located in a
limited space, such as a building or a campus.
on the contrary, a wan (wide area network)
operates in a larger area and it can reach most of the
world, so it could be described as a collection of
lans all over the world.
the exchange of information in a network is
controlled by communications protocols, which
define the formats and rules that computers must
follow when talking to one another.
well-known communications protocols are ethernet,
which is a family of protocols used in lans, and the
internet protocol suite, which is used in any
computer network.
computer networks offer many advantages. for
example, they fa cilitate communication , al lowing
people to send emails and texts, make phone/video
calls and videoconference. furthermore, networks
allow people to share files, data, and other types of
information as users may access data and information
stored on other computers in the network.
on the other hand , networks may be difficult to set
up and may be insecure as computer hackers can
send viruses or computer worms to the net computer.
they may also interfere with other technologies, as
power line communication strongly disturbs certain
forms of radio communication and access technology
such as adsl.
1 what does a network consist of?
2 what is a router?
3 what is a lan?
4 what is a wan?
5 what is the function of communications protocols?
6 what is ethernet used for?
7 what are the advantages of usi ng a network?
8 what are the disadvantages of using a network?
2.She has never eaten candy floss
3.He has just gone souvenir shopping
4.We have recently read this book
5.They have not travelled to Europe yet
II
1.Have they just arrived?
2.She hasn't packed her suitcase yet.
3.We have been to the camp for 2 weeks/.
4.Have you ever shaken hands with cartoon characters?
5.I have never seen a robot.
III
1. I have already done my homework. (do)
2. He has just come home. (come)
3. She has already nade a calculation ( make).
4. We have already solved the problem. (solve)
5. He has just finished his work.(finish)
6. They haven't come from the south yet .
7. Have you ever eaten Italian food? (eat)
8. Have you done a lot of training this year? (do)
Важные даты:
21 января 1990 - Саша Болдачёв родился в городе Санкт-Петербурге.
1994 - он начинает учиться музыке
1995 - Саша начинает учиться в лицее Санкт-Петербургской консерватории
1996 - он начинает сочинять свою собственную музыку и выступать на концертах
1999 - Саша посещает Литву в честь своего первого зарубежного концертного тура
2000 - он одерживает победу в своих первых крупных соревнованиях
2005 - Саша становится лауреатом европейского культурного фонда
Местожительство: Саша живет в Санкт-Петербурге
Семья: Мама Саши, Ирина Шарапова, пианист и профессор Петербургской консерватории. Его отец, Александр, книжный и рекламный оформитель.
Рутина: Музыка занимает большое количество Сашиного времени. Он занимается музыкой ежедневно по несколько часов. Он также путешествует и даёт концерты по всему миру.
Хобби: В свободное время Саша читает, смотрит телевизор и играет в компьютерные игры. Летом он отправляется на рыбалку и охоту за грибами.
Домашние животные: У семьи Болдачевых три кота: Модя, Виня и Гоша.