ICT 9 lecture ++

1.

Lection 9
INTERNET
TECHNOLOGIES
Senior Lecturer – KURMANBEKKYZY NURGUL
Candidate of Physical and Mathematical Sciences,
Associate Professor

2.

CONTENTS
Basic concepts Internet.
The universal identifier of resources (URI), its
assignment and components.
Service DNS.
Web technologies: HTTP, DHTML,
CSS, and JavaScript.
E-mail. Message format.
SMTP, POP3, IMAP protocols.

3.

INTERNET
a world system of interconnected
computer networks, built on the
use of IP Protocol and routing of
data packets

4.

HISTORY OF THE INTERNET
Date
Event
1957
1969
Idea about a reliable system of
information transmission
ARPANET appeared
1969
First ARPANET server
1969
First communication session

5.

HISTORY OF THE INTERNET
Date
Event
1971
First e-mail program
1973
Network became international
1983
TCP/IP
1984
DNS

6.

HISTORY OF THE INTERNET
Date
Event
1984
NSFNet appeared
1988
IRC protocol
1989
WWW
1990
ARPANET stopped to exist

7.

HISTORY OF THE INTERNET
Date
Event
1990
First dialup access
1991
WWW became available in the
Internet
First browser NCSA Mosaic
1993
1995
Routing all traffic is now
engaged in network providers
companies

8.

WORLD WIDE WEB (WWW)
a distributed system that provides access
to related documents located on different
computers connected to the Internet

9.

HYPERLINK
some of the file element of the web
page usually allocated by color or by
underlining, which is the starting
point to navigate to the another web
pages.

10.

WEB-PAGE
a computer file created using a
special hypertext markup
language HTML

11.

WEB-SITE
collection of web pages, which
are united by some principle

12.

WEB-SERVER
server that accepts HTTP requests
from clients, typically web browsers,
and issues them HTTP responses,
usually together with an HTML page

13.

UNIFORM RESOURCE IDENTIFIER (URI)
a sequence of characters that
identifies an abstract or
physical resource

14.

UNIFORM RESOURCE LOCATOR (URL)
URI that, in addition to identifying a
resource, provides information on the
location of this resource

15.

UNIFORM RESOURCE NAME (URN)
URI, that only
identify a
resource in a certain namespace

16.

DOMAIN NAME SYSTEM, DNS
a centralized service based on
distributed database of mappings
«domain name – IP address»

17.

DNS SERVER
special software for DNS service

18.

DNS CLIENT
special library (or program) for
work with DNS

19.

DOMAIN
a node in the tree of names,
together with all subordinate
nodes

20.

21.

HYPERTEXT TRANSFER PROTOCOL
application layer protocol
of data transmission

22.

HTTP MESSAGES
HTTP clients requests
HTTP servers
responses

23.

HTTP METHODS
POST
HTTP clients
GET
PUT
HTTP servers

24.

DHTML
HTML
DOM
JavaScript
CSS

25.

HYPERTEXT MARKUP LANGUAGE (HTML)
standardized markup language for
documents on the world wide web.

26.

JAVASCRIPT
programming language that adds
interactivity to the web site

27.

AJAX
approach to building interactive user
interfaces of web applications, based on the
"background" data-sharing between browser
and web server.

28.

CASCADING STYLE SHEETS (CSS)
technology of description of the
appearance of a document executed
by the markup language

29.

SMTP PROTOCOL
MAIL FROM
RCPT TO
DATA

30.

SIMPLE MAIL TRANSFER PROTOCOL (SMTP)

31.

PROGRAMS FOR EMAIL
Mail Delivery
Agent
Mail Transfer
Mail User
Agent
Agent

32.

CONCLUSION
URI
for identification of the web
resources
CSS for style of HTML documents
JavaScript for interaction of user and
web-srever
IMAP, POP3 protocols for receiving
mail