A computer network allows computers to share information and resources. Key developments include the launch of Sputnik, the creation of ARPA to develop early networks, and the establishment of ARPANET. Computer networks facilitate communication, sharing of hardware/files, and access to software. Networks can be classified based on medium, topology, and organization structure. Topologies include ring, star, mesh, bus, and mixed. Organization structures range from local area networks (LANs) within an office to wide area networks (WANs) spanning countries and the global Internet. Future networks will connect more devices like appliances and support advanced applications while becoming more adaptive and secure as data volumes increase dramatically.

1. Computer Networks

2. Computer Networks
 A computer network is a system in which computers
are connected to share information and resources.

3. Computer Networks
History:
 Sputnik 1st Artificial Satellite in Earth Orbit in 1957
 ARPA in 1958 to create IPTO (Information Processing Technique Office)
 ARPA Net in 1959

4. Computer Networks
Uses of Computer Networks:
 Facilitating Communication
Via email, instant messaging, telephone
 Sharing Hardware:
Printer, Scanners.
 Sharing Files, Data & Info :
Any authorized user can access data from other
computer
 Sharing Software's:
Users connected to a network can access
application programs on a network.

5. Computer Networks
Types of Computer Networks based on:
 Medium used to transport the data
 Topology
 Organization Structure

6. Computer Networks
Medium used to transport the data

7. Computer Networks
 Topology
The layout of a network & how different nodes in a
network are connected together.

8. Computer Networks
 Types of Topology:
Ring Topology
Star Topology
Mesh Topology
Bus Topology Mixed Topology

9. Computer Networks
 Types of Topology:
Ring Topology

10. Computer Networks
 Types of Topology:
Ring Topology
Star Topology

11. Computer Networks
 Types of Topology:
Ring Topology
Star Topology
Mesh Topology

12. Computer Networks
 Types of Topology:
Ring Topology
Star Topology
Mesh Topology
Bus Topology

13. Computer Networks
 Types of Topology:
Ring Topology
Star Topology
Mesh Topology
Bus Topology Mixed Topology

14. Computer Networks
 Organization Structure
Geographical dispersion of computers and end devices.
LAN
MAN
WAN
INTERNET

15. Computer Networks
 Organization Structure (LAN)
A Computer Network that interconnects computers within a
limited area i.e. office, home, laboratory

16. Computer Networks
 Organization Structure (MAN):
It optimized for larger geographical area than LAN ranging
from several blocks of building to entire city.

17. Computer Networks
Organization Structure (WAN):
 It is a network that interconnects computer over a broad area
 Allows government & business organization to communicate
regardless of geographical area.

18. Computer Networks
 Internet:
A global system of interconnected computer networks to
serve billion of users worldwide.

19. Computer Networks (Internet Users)
Rank
(No. Of Users)
Name of Country Users
(thousands)
Percentage
of Population (%)
1 China 477,000 36.3%
2 United States 245,000 78.2%
3 India 100,001 8.5%
4 Japan 99,144 78.4%
6 Germany 65,124 79.9%
7 Russia 59,700 43%
8 United Kingdom 51,442 82.0%
9 France 45,262 69.5%
12 South Korea 39,440 80.9%
15 Iran 33,200 46.9%
25 Pakistan 18,500 10.9%

20. Future
Of
Computer Networks

21. Future of Computer Networks
Future Networks will be completely different from
present networks.
 We are expecting even house hold appliances like
electric bulb and toaster to be a part of network.
 They will have their own IP Addresses to make
them accessible & Controlled by Network.

22. Future of Computer Networks

23. Future of Computer Networks
Why do we need it?

24. Future of Computer Networks
For efficient use of energy & centralized control.

25. Future of Computer Networks
 In future, networks will be over whelmed data.
 The security concern will also increase.
 It is not expected even for a full time system
administrator to deal with these concerns.

26. Future of Computer Networks
 In other to cope with them, the networks will work on different
protocols named as adaptive networks.
 Their job will be to provide personal experience for every user
with minimum maintaince.
 Adaptive networks will also support application like VOIP,
Video Conferencing.

27. Future of Computer Networks
 Bluetooth will replace every wire that we use.

28. Future of Computer Networks
 Bluetooth will replace every wire that we use.
 Its primary purpose was to replace USB but in future we are
expecting to connect our TV to DVD Player by Bluetooth or
even speaker to radio.

29. Future of Computer Networks
 Bluetooth will replace every wire that we use.
 Its primary purpose was to replace USB but in future we are
expecting to connect our TV to DVD Player by Bluetooth or
even speaker to radio.