1. Internet & network
Internet & network

2. The internet is a global system of inter connected millons of computer
What is a internet??
The internet is a global system of inter connected millons of computer

3. internet use the stranded internet protocol suite to link several billon devices world wild it is connecting every places, countries to exchange of data ,news and opinions

4. Advantages of internet…..
Global audience
Accessibility
Operates 24 hours 7 days a week
Relatively inexpensive
Communication
Information education
Entertainment
advertising

5. History of internet
In 1969,the US department of defense started a project to allow researchers and military personnel to communicate with each other in a emergency
The project was called ARPANET and it is the foundation of internet
After 1970’s ARPANET grows to 30 nodes
First message sent in 1970
After 1990 launch world wild web (www)

6. What is World wild web
"WWW" and "The web" redirect here. For other uses of WWW, see WWW (disambiguation). For other uses of web, see Web (disambiguation).
The World Wide Web (abbreviated as WWW or W3,commonly known as the Web) is a system of interlinked hypertext documents that are accessed via the Internet. With a web browser, one can view web pages that may contain text, images, videos, and other multimedia and navigate between them via hyperlinks.

7. Web browser
A web browser (commonly referred to as a browser) is a software application for retrieving, presenting and traversing information resources on the World Wide Web. An information resource is identified by a Uniform Resource Identifier (URI/URL) and may be a web page, image, video or other piece of content. Hyperlinks present in resources enable users easily to navigate their browsers to related resources.

8. Internet protocol
The Internet Protocol (IP) is the principal communications protocol in the Internet protocol suite for relaying datagrams across network boundaries. Its routing function enables internetworking, and essentially establishes the Internet.
IP, as the primary protocol in the Internet layer of the Internet protocol suite, has the task of delivering packets from the source host to the destination host solely based on the IP addresses in the packet headers. For this purpose, IP defines packet structures that encapsulate the data to be delivered. It also defines addressing methods that are used to label the datagram with source and destination information.

9. Why is the internet so important in our daily lives?
Electronic devices, multimedia and computers are things we are faced with everyday. They are a big influence in our daily lives. we used to , fax and all tings work to internet for our life

10. Worldwide Internet users
World wild web usage
Worldwide Internet users
World population billion 6.9 billion 7.1 billion
Not using the Internet % 70% 61%
Using the Internet % 30% 39%
Users in the developing world % 21% 31%
Users in the developed world % 67% 77%

11. Routing and service tiers
Internet service providers connect customers, which represent the bottom of the routing hierarchy, to customers of other ISPs via other higher or same-tier networks. At the top of the routing hierarchy are the tier 1 networks, large telecommunication companies that exchange traffic directly with each other via peering agreements. Tier 2 and lower level networks buy Internet transit from other providers to reach at least some parties on the global Internet, though they may also engage in peering. An ISP may use a single upstream provider for connectivity, or implement multihoming to achieve redundancy and load balancing. Internet exchange points are major traffic exchanges with physical connections to multiple ISPs.

12. Types of web sites Commercial websites Community websites
Educational websites
News websites

13. URL (uniform resource locator)
Protocol host name file name
“an address that point to a particular document or other resource on the internet used most frequently on the world wild web”

14. network

15. What is a network
“network is interconnection collection of computer for pupors of sharing resources and communication”

16. A network is mead up with following components
Computer
Transmissions media
Interface
protocols

17. Types of network LAN - local area network MAN- meteorite area network
WAN wide area network

18. Others types of network
PAN-personal area network
CAN-camp area network
GAN-global area network

19. Network architectures'
Peer to peer architecture
all are client
No special configuration
Client o/s
Local users

20. Client sever architecture
Client severs available
Has special configuration
Domain user account
Client o/s

21. Modes of communication
Simplex
Half duplex
full duplex

22. Communication media Guided media Transmission media Unguided media
Twisted pair cable
Coaxial cable
Fiber optics cable
Unguided media
Radio waves
Microwaves
Satellite
Bluetooth

23. Network Topologies
Network topology is the arrangement of the various elements (links, nodes, etc.) of a computer network. Essentially, it is the topological structure of a network and may be depicted physically or logically.
The cabling layout used to link devices is the physical topology of the network. This refers to the layout of cabling, the locations of nodes, and the interconnections between the nodes and the cabling. The physical topology of a network is determined by the capabilities of the network access devices and media, the level of control or fault tolerance desired, and the cost associated with cabling or telecommunications circuits
Physical topologies .
The logical topology in contrast, is the way that the signals act on the network media, or the way that the data passes through the network from one device to the next without regard to the physical interconnection of the devices. A network's logical topology is not necessarily the same as its physical topology
Logical topologies

24. basic topologies Bus network topology Star network topology
Ring network topology
mesh topology
tree topology

25. End the presentation

26. Presentation design eshani anuththara 14NU0513